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.
12 results
Oct 23, 2026Snap7 through 1.4.3 contains an out-of-bounds write vulnerability in the passive partner that allows a malicious active partner to overflow application buffers CVE-2026-115723 · Other software · davenardella · reported by VulnCheckHigh 8.3
Snap7 through 1.4.3 contains an out-of-bounds write vulnerability in the passive partner that allows a malicious active partner to overflow application buffers by declaring an unvalidated BSend total length. Attackers connecting from the configured peer address can declare up to 65535 bytes and send a short fragment, causing BRecv to memcpy past the buffer and crash or corrupt SCADA, HMI or gateway processes.
- Product
- snap7
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 15, 2026snap7 through 1.4.3 contains an out-of-bounds write vulnerability in TSnap7MicroClient::opReadArea() that allows malicious S7 peers to overflow client buffers vCVE-2026-111280 · Other software · davenardella · reported by VulnCheckHigh 8.3
snap7 through 1.4.3 contains an out-of-bounds write vulnerability in TSnap7MicroClient::opReadArea() that allows malicious S7 peers to overflow client buffers via an unchecked DataLength field. Rogue or impersonated PLCs can return crafted ReadVar responses causing memcpy of up to 65535 bytes into caller buffers, crashing SCADA, HMI, or gateway processes and corrupting memory.
- Product
- snap7
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Sep 13, 2026A vulnerability was determined in davenardella snap7 up to 1.4.3.CVE-2026-90572 · Other software · davenardella · reported by VulDBLow 2
A vulnerability was determined in davenardella snap7 up to 1.4.3. The affected element is the function TSnap7MicroClient::opUpload of the file src/core/s7_micro_client.cpp. Executing a manipulation of the argument DataLen can lead to memory corruption. The attack can be executed remotely. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.
- Product
- snap7
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 19, 2026A security flaw has been discovered in davenardella snap7 up to 1.4.3.CVE-2026-16225 · Other software · davenardella · reported by VulDBLow 2.1
A security flaw has been discovered in davenardella snap7 up to 1.4.3. The impacted element is the function TSnap7Peer::NegotiatePDULength of the file src/core/s7_peer.cpp. The manipulation of the argument PDULength results in out-of-bounds write. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.
- Product
- snap7
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 8, 2026A flaw has been found in davenardella snap7 up to 1.4.3.CVE-2026-15105 · Other software · davenardella · reported by VulDBLow 2.1
A flaw has been found in davenardella snap7 up to 1.4.3. This affects the function TS7Worker::PerformFunctionRead of the file src/core/s7_server.cpp of the component ReadVar Request Handler. This manipulation causes out-of-bounds write. The attack requires access to the local network. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.
- Product
- snap7
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jun 29, 2026A heap buffer overflow in the TS7Worker::PerformFunctionWrite() function (/core/s7_server.cpp) of snap7 v1.4.3 allows attackers to cause a Denial of Service (DoCVE-2026-51218 · Other software · reported by MITREHigh 7.5
A heap buffer overflow in the TS7Worker::PerformFunctionWrite() function (/core/s7_server.cpp) of snap7 v1.4.3 allows attackers to cause a Denial of Service (DoS) via a crafted packet.
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Dec 30, 2025A vulnerability was identified in gmg137 snap7-rs up to 153d3e8c16decd7271e2a5b2e3da4d6f68589424.CVE-2025-15247 · Other software · gmg137 · reported by VulDBMedium 5.5
A vulnerability was identified in gmg137 snap7-rs up to 153d3e8c16decd7271e2a5b2e3da4d6f68589424. Affected by this issue is the function snap7_rs::client::S7Client::download of the file client.rs. Such manipulation leads to heap-based buffer overflow. The attack can be executed remotely. The exploit is publicly available and might be used. This product implements a rolling release for ongoing delivery, which means version information for affected or updated releases is unavailable. The project was informed of the problem early through an issue report but has not responded yet.
- Product
- snap7-rs
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Dec 14, 2025A vulnerability has been found in gmg137 snap7-rs up to 1.142.1.CVE-2025-14673 · Other software · gmg137 · reported by VulDBMedium 5.5
A vulnerability has been found in gmg137 snap7-rs up to 1.142.1. Affected is the function snap7_rs::client::S7Client::as_ct_write of the file /tests/snap7-rs/src/client.rs. The manipulation leads to heap-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
- Product
- snap7-rs
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Dec 14, 2025A flaw has been found in gmg137 snap7-rs up to 1.142.1.CVE-2025-14672 · Other software · gmg137 · reported by VulDBMedium 5.5
A flaw has been found in gmg137 snap7-rs up to 1.142.1. This impacts the function TSnap7MicroClient::opWriteArea of the file s7_micro_client.cpp. Executing a manipulation can lead to heap-based buffer overflow. It is possible to launch the attack remotely. The exploit has been published and may be used.
- Product
- snap7-rs
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Jul 14, 2025A vulnerability, which was classified as critical, has been found in gmg137 snap7-rs up to 1.142.1.CVE-2025-7616 · Other software · gmg137 · reported by VulDBLow 2
A vulnerability, which was classified as critical, has been found in gmg137 snap7-rs up to 1.142.1. Affected by this issue is the function pthread_cond_destroy of the component Public API. The manipulation leads to memory corruption. The exploit has been disclosed to the public and may be used.
- Product
- snap7-rs
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 28, 2020The Snap7 server component in version 1.4.1, when an attacker sends a crafted packet with COTP protocol the last-data-unit flag set to No and S7 writes a var fuCVE-2020-22552 · Other software · Snap7 Project · reported by MITREHigh 7.5
The Snap7 server component in version 1.4.1, when an attacker sends a crafted packet with COTP protocol the last-data-unit flag set to No and S7 writes a var function, the Snap7 server will be crashed.
- Product
- Snap7
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordsourceforge.netsourceforge.net
Nov 17, 2017The Snap7 Server version 1.4.1 can be crashed when the ItemCount field of the ReadVar or WriteVar functions of the S7 protocol implementation in Snap7 are proviCVE-2017-1000230 · Other software · Snap7 Project · reported by MITREHigh 7.5
The Snap7 Server version 1.4.1 can be crashed when the ItemCount field of the ReadVar or WriteVar functions of the S7 protocol implementation in Snap7 are provided with unexpected input, thus resulting in denial of service attack.
- Product
- Snap7 Server
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordsourceforge.netsourceforge.net
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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