Updated 5 h ago

Vulnerability database

Every flaw the U.S. government’s cybersecurity agency (CISA) has confirmed attackers are using, plus the new WordPress plugin and theme bugs published each day, sorted by what they mean for a small business. We refresh it twice a day. If you see something your website or office runs, tell us.

1,766exploited flaws on CISA’s list

36added in the last 30 days

584new WordPress flaws this week

391,288entries in the database

4,089 results · page 31 of 82

Dec 22, 2022When navigating from inside an iframe while requesting fullscreen access, an attacker-controlled tab could have made the browser unable to leave fullscreen modeCVE-2022-22743 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
When navigating from inside an iframe while requesting fullscreen access, an attacker-controlled tab could have made the browser unable to leave fullscreen mode. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022When inserting text while in edit mode, some characters might have lead to out-of-bounds memory access causing a potentially exploitable crash.CVE-2022-22742 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
When inserting text while in edit mode, some characters might have lead to out-of-bounds memory access causing a potentially exploitable crash. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022When resizing a popup while requesting fullscreen access, the popup would have become unable to leave fullscreen mode.CVE-2022-22741 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
When resizing a popup while requesting fullscreen access, the popup would have become unable to leave fullscreen mode. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022Certain network request objects were freed too early when releasing a network request handle.CVE-2022-22740 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Certain network request objects were freed too early when releasing a network request handle. This could have lead to a use-after-free causing a potentially exploitable crash. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022Malicious websites could have tricked users into accepting launching a program to handle an external URL protocol.CVE-2022-22739 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Malicious websites could have tricked users into accepting launching a program to handle an external URL protocol. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022Applying a CSS filter effect could have accessed out of bounds memory.CVE-2022-22738 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Applying a CSS filter effect could have accessed out of bounds memory. This could have lead to a heap-buffer-overflow causing a potentially exploitable crash. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022Constructing audio sinks could have lead to a race condition when playing audio files and closing windows.CVE-2022-22737 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
Constructing audio sinks could have lead to a race condition when playing audio files and closing windows. This could have lead to a use-after-free causing a potentially exploitable crash. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022If Firefox was installed to a world-writable directory, a local privilege escalation could occur when Firefox searched the current directory for system librarieCVE-2022-22736 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7
If Firefox was installed to a world-writable directory, a local privilege escalation could occur when Firefox searched the current directory for system libraries. However the install directory is not world-writable by default.<br>*This bug only affects Firefox for Windows in a non-default installation. Other operating systems are unaffected.*. This vulnerability affects Firefox < 96.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022The search term could have been specified externally to trigger SQL injection.CVE-2022-1887 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
The search term could have been specified externally to trigger SQL injection. This vulnerability affects Firefox for iOS < 101.
Product
Firefox for iOS
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022If an attacker was able to corrupt the methods of an Array object in JavaScript via prototype pollution, they could have achieved execution of attacker-controllCVE-2022-1802 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
If an attacker was able to corrupt the methods of an Array object in JavaScript via prototype pollution, they could have achieved execution of attacker-controlled JavaScript code in a privileged context. This vulnerability affects Firefox ESR < 91.9.1, Firefox < 100.0.2, Firefox for Android < 100.3.0, and Thunderbird < 91.9.1.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022An attacker could have sent a message to the parent process where the contents were used to double-index into a JavaScript object, leading to prototype pollutioCVE-2022-1529 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
An attacker could have sent a message to the parent process where the contents were used to double-index into a JavaScript object, leading to prototype pollution and ultimately attacker-controlled JavaScript executing in the privileged parent process. This vulnerability affects Firefox ESR < 91.9.1, Firefox < 100.0.2, Firefox for Android < 100.3.0, and Thunderbird < 91.9.1.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022Mozilla developers Kershaw Chang, Ryan VanderMeulen, and Randell Jesup reported memory safety bugs present in Firefox 97.CVE-2022-0843 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers Kershaw Chang, Ryan VanderMeulen, and Randell Jesup reported memory safety bugs present in Firefox 97. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 98.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022Mozilla developers and community members Gabriele Svelto, Sebastian Hengst, Randell Jesup, Luan Herrera, Lars T Hansen, and the Mozilla Fuzzing Team reported meCVE-2022-0511 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers and community members Gabriele Svelto, Sebastian Hengst, Randell Jesup, Luan Herrera, Lars T Hansen, and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 96. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 97.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022If a domain name contained a RTL character, it would cause the domain to be rendered to the right of the path.CVE-2021-4221 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
If a domain name contained a RTL character, it would cause the domain to be rendered to the right of the path. This could lead to user confusion and spoofing attacks. <br>*This bug only affects Firefox for Android. Other operating systems are unaffected.*<br>*Note*: Due to a clerical error this advisory was not included in the original announcement, and was added in Feburary 2022. This vulnerability affects Firefox < 92.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022It was possible to construct specific XSLT markup that would be able to bypass an iframe sandbox.CVE-2021-4140 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 10
It was possible to construct specific XSLT markup that would be able to bypass an iframe sandbox. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safetCVE-2021-4129 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 9.8
Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safety bugs present in Firefox 94. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 95, Firefox ESR < 91.4.0, and Thunderbird < 91.4.0.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 22, 2022When transitioning in and out of fullscreen mode, a graphics object was not correctly protected; resulting in memory corruption and a potentially exploitable crCVE-2021-4128 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
When transitioning in and out of fullscreen mode, a graphics object was not correctly protected; resulting in memory corruption and a potentially exploitable crash.<br>*This bug only affects Firefox on MacOS. Other operating systems are unaffected.*. This vulnerability affects Firefox < 95.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Jun 29, 2022MetaMask before 10.11.3 might allow an attacker to access a user's secret recovery phrase because an input field is used for a BIP39 mnemonic, and Firefox and CCVE-2022-32969 · Other software · Metamask · reported by MITREMedium 5.9
MetaMask before 10.11.3 might allow an attacker to access a user's secret recovery phrase because an input field is used for a BIP39 mnemonic, and Firefox and Chromium save such fields to disk in order to support the Restore Session feature, aka the Demonic issue.
Product
Metamask
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record github.com halborn.com
Dec 8, 2021When receiving a URL through a SEND intent, Firefox would have searched for the text, but subsequent usages of the address bar might have caused the URL to loadCVE-2021-43544 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.1
When receiving a URL through a SEND intent, Firefox would have searched for the text, but subsequent usages of the address bar might have caused the URL to load unintentionally, which could lead to XSS and spoofing attacks. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 95.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2021WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with theCVE-2021-43540 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org security.gentoo.org
Dec 8, 2021A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable CVE-2021-43535 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.3, and Firefox ESR < 91.3.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org lists.debian.org
Dec 8, 2021Mozilla developers and community members reported memory safety bugs present in Firefox 93 and Firefox ESR 91.2.CVE-2021-43534 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers and community members reported memory safety bugs present in Firefox 93 and Firefox ESR 91.2. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org lists.debian.org
Dec 8, 2021When parsing internationalized domain names, high bits of the characters in the URLs were sometimes stripped, resulting in inconsistencies that could lead to usCVE-2021-43533 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
When parsing internationalized domain names, high bits of the characters in the URLs were sometimes stripped, resulting in inconsistencies that could lead to user confusion or attacks such as phishing. This vulnerability affects Firefox < 94.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2021The 'Copy Image Link' context menu action would copy the final image URL after redirects.CVE-2021-43532 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.1
The 'Copy Image Link' context menu action would copy the final image URL after redirects. By embedding an image that triggered authentication flows - in conjunction with a Content Security Policy that stopped a redirection chain in the middle - the final image URL could be one that contained an authentication token used to takeover a user account. If a website tricked a user into copy and pasting the image link back to the page, the page would be able to steal the authentication tokens. This was fixed by making the action return the original URL, before any redirects. This vulnerability affects Firefox < 94.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2021When a user loaded a Web Extensions context menu, the Web Extension could access the post-redirect URL of the element clicked.CVE-2021-43531 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
When a user loaded a Web Extensions context menu, the Web Extension could access the post-redirect URL of the element clicked. If the Web Extension lacked the WebRequest permission for the hosts involved in the redirect, this would be a same-origin-violation leaking data the Web Extension should have access to. This was fixed to provide the pre-redirect URL. This is related to CVE-2021-43532 but in the context of Web Extensions. This vulnerability affects Firefox < 94.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2021A Universal XSS vulnerability was present in Firefox for Android resulting from improper sanitization when processing a URL scanned from a QR code.CVE-2021-43530 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.1
A Universal XSS vulnerability was present in Firefox for Android resulting from improper sanitization when processing a URL scanned from a QR code. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 94.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2021The executable file warning was not presented when downloading .inetloc files, which, due to a flaw in Mac OS, can run commands on a user's computer.*Note: ThisCVE-2021-38510 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
The executable file warning was not presented when downloading .inetloc files, which, due to a flaw in Mac OS, can run commands on a user's computer.*Note: This issue only affected Mac OS operating systems. Other operating systems are unaffected.*. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2021Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary (although unstyled) contents could be displayed over top anCVE-2021-38509 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's choosing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org lists.debian.org
Dec 8, 2021By displaying a form validity message in the correct location at the same time as a permission prompt (such as for geolocation), the validity message could haveCVE-2021-38508 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
By displaying a form validity message in the correct location at the same time as a permission prompt (such as for geolocation), the validity message could have obscured the prompt, resulting in the user potentially being tricked into granting the permission. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org lists.debian.org
Dec 8, 2021The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded to TLS while retaining the visual properties of an HTTCVE-2021-38507 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
The Opportunistic Encryption feature of HTTP2 (RFC 8164) allows a connection to be transparently upgraded to TLS while retaining the visual properties of an HTTP connection, including being same-origin with unencrypted connections on port 80. However, if a second encrypted port on the same IP address (e.g. port 8443) did not opt-in to opportunistic encryption; a network attacker could forward a connection from the browser to port 443 to port 8443, causing the browser to treat the content of port 8443 as same-origin with HTTP. This was resolved by disabling the Opportunistic Encryption feature, which had low usage. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org lists.debian.org
Dec 8, 2021Through a series of navigations, Firefox could have entered fullscreen mode without notification or warning to the user.CVE-2021-38506 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 4.3
Through a series of navigations, Firefox could have entered fullscreen mode without notification or warning to the user. This could lead to spoofing attacks on the browser UI including phishing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org lists.debian.org
Dec 8, 2021Microsoft introduced a new feature in Windows 10 known as Cloud Clipboard which, if enabled, will record data copied to the clipboard to the cloud, and make it CVE-2021-38505 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Microsoft introduced a new feature in Windows 10 known as Cloud Clipboard which, if enabled, will record data copied to the clipboard to the cloud, and make it available on other computers in certain scenarios. Applications that wish to prevent copied data from being recorded in Cloud History must use specific clipboard formats; and Firefox before versions 94 and ESR 91.3 did not implement them. This could have caused sensitive data to be recorded to a user's Microsoft account. *This bug only affects Firefox for Windows 10+ with Cloud Clipboard enabled. Other operating systems are unaffected.*. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Dec 8, 2021When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-after-free could have resulted, leading to memory corruption anCVE-2021-38504 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
When interacting with an HTML input element's file picker dialog with webkitdirectory set, a use-after-free could have resulted, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org lists.debian.org
Dec 8, 2021The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the tCVE-2021-38503 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgCritical 10
The iframe sandbox rules were not correctly applied to XSLT stylesheets, allowing an iframe to bypass restrictions such as executing scripts or navigating the top-level frame. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org lists.debian.org
Nov 3, 2021Possible system denial of service in case of arbitrary changing Firefox browser parameters.CVE-2021-35053 · Other software · Kaspersky · reported by vulnerability@kaspersky.comHigh 7.5
Possible system denial of service in case of arbitrary changing Firefox browser parameters. An attacker could change specific Firefox browser parameters file in a certain way and then reboot the system to make the system unbootable.
Product
Endpoint Security
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record support.kaspersky.com zerodayinitiative.com
Nov 2, 2021Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1.CVE-2021-38501 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Nov 2, 2021Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1.CVE-2021-38500 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org lists.debian.org
Nov 2, 2021Mozilla developers reported memory safety bugs present in Firefox 92.CVE-2021-38499 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers reported memory safety bugs present in Firefox 92. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 93.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Nov 2, 2021During process shutdown, a document could have caused a use-after-free of a languages service object, leading to memory corruption and a potentially exploitableCVE-2021-38498 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 7.5
During process shutdown, a document could have caused a use-after-free of a languages service object, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Nov 2, 2021Through use of reportValidity() and window.open(), a plain-text validation message could have been overlaid on another origin, leading to possible user confusioCVE-2021-38497 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Through use of reportValidity() and window.open(), a plain-text validation message could have been overlaid on another origin, leading to possible user confusion and spoofing attacks. This vulnerability affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Nov 2, 2021Mozilla developers reported memory safety bugs present in Firefox 91.CVE-2021-38494 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers reported memory safety bugs present in Firefox 91. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 92.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Nov 2, 2021Mozilla developers reported memory safety bugs present in Firefox 91 and Firefox ESR 78.13.CVE-2021-38493 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers reported memory safety bugs present in Firefox 91 and Firefox ESR 78.13. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.14, Thunderbird < 78.14, and Firefox < 92.
Product
Firefox ESR
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org security.gentoo.org
Nov 2, 2021When delegating navigations to the operating system, Firefox would accept the `mk` scheme which might allow attackers to launch pages and execute scripts in IntCVE-2021-38492 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
When delegating navigations to the operating system, Firefox would accept the `mk` scheme which might allow attackers to launch pages and execute scripts in Internet Explorer in unprivileged mode. *This bug only affects Firefox for Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox < 92, Thunderbird < 91.1, Thunderbird < 78.14, Firefox ESR < 78.14, and Firefox ESR < 91.1.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org security.gentoo.org
Nov 2, 2021Mixed-content checks were unable to analyze opaque origins which led to some mixed content being loaded.CVE-2021-38491 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgMedium 6.5
Mixed-content checks were unable to analyze opaque origins which led to some mixed content being loaded. This vulnerability affects Firefox < 92.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org security.gentoo.org
Nov 2, 2021Firefox for Android allowed navigations through the `intent://` protocol, which could be used to cause crashes and UI spoofs.CVE-2021-29993 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Firefox for Android allowed navigations through the `intent://` protocol, which could be used to cause crashes and UI spoofs. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 92.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Nov 2, 2021Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers.CVE-2021-29991 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.1
Firefox incorrectly accepted a newline in a HTTP/3 header, interpretting it as two separate headers. This allowed for a header splitting attack against servers using HTTP/3. This vulnerability affects Firefox < 91.0.1 and Thunderbird < 91.0.1.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org mozilla.org
Oct 14, 2021A redirect vulnerability in the `fastify-static` module version >= 4.2.4 and < 4.4.1 allows remote attackers to redirect Mozilla Firefox users to arbitrary websCVE-2021-22964 · Other software · Fastify · reported by support@hackerone.comHigh 8.8
A redirect vulnerability in the `fastify-static` module version >= 4.2.4 and < 4.4.1 allows remote attackers to redirect Mozilla Firefox users to arbitrary websites via a double slash `//` followed by a domain: `http://localhost:3000//a//youtube.com/%2e%2e%2f%2e%2e`.A DOS vulnerability is possible if the URL contains invalid characters `curl --path-as-is "http://localhost:3000//^/.."`The issue shows up on all the `fastify-static` applications that set `redirect: true` option. By default, it is `false`.
Product
Fastify-static
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record hackerone.com hackerone.com
Aug 17, 2021Mozilla developers and community members reported memory safety bugs present in Firefox 90.CVE-2021-29990 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers and community members reported memory safety bugs present in Firefox 90. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 91.
Product
Firefox
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org security.gentoo.org
Aug 17, 2021Mozilla developers reported memory safety bugs present in Firefox 90 and Firefox ESR 78.12.CVE-2021-29989 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Mozilla developers reported memory safety bugs present in Firefox 90 and Firefox ESR 78.12. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 78.13, Firefox ESR < 78.13, and Firefox < 91.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org security.gentoo.org
Aug 17, 2021Firefox incorrectly treated an inline list-item element as a block element, resulting in an out of bounds read or memory corruption, and a potentially exploitabCVE-2021-29988 · Computers, phones & browsers · Mozilla · reported by security@mozilla.orgHigh 8.8
Firefox incorrectly treated an inline list-item element as a block element, resulting in an out of bounds read or memory corruption, and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
Product
Thunderbird
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.mozilla.org security.gentoo.org

Where this comes from: the exploited list is CISA’s Known Exploited Vulnerabilities catalog. Everything else is the whole National Vulnerability Database, where each record is published by the team that found the bug (Wordfence, Patchstack, WPScan, the vendors themselves and others); we show who. Exploit odds are FIRST’s EPSS, updated daily. Titles and categories are ours, so check the linked record before acting on a detail. For a write-up of the big ones, see our advisories. Every vendor, and every WordPress plugin and theme with a recorded flaw, also has its own page. All of it is free to reuse as JSON, CSV or RSS.

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