NTP vulnerabilities

By year

Bars are flaws published each year; the red part is the share attackers have used.

Latest high and critical flaws

• CVE-2020-13817 ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows remote attackers to cause a denial of service (daemon exit or system time change) by predicting tranHigh 7.4 · Jun 4, 2020
• CVE-2020-11868 ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated synchronization via a server mode packet with a spoofeHigh 7.5 · Apr 17, 2020
• CVE-2019-11331 Network Time Protocol (NTP), as specified in RFC 5905, uses port 123 even for modes where a fixed port number is not required, which makes it easier for remote High 8.1 · Apr 18, 2019
• CVE-2018-12327 Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker to achieve code execution or escalate to higher privileges via a long sCritical 9.8 · Jun 20, 2018
• CVE-2018-7183 Buffer overflow in the decodearr function in ntpq in ntp 4.2.8p6 through 4.2.8p10 allows remote attackers to execute arbitrary code by leveraging an ntpq query Critical 9.8 · Mar 8, 2018
• CVE-2018-7185 The protocol engine in ntp 4.2.6 before 4.2.8p11 allows a remote attackers to cause a denial of service (disruption) by continually sending a packet with a zeroHigh 7.5 · Mar 6, 2018
• CVE-2018-7184 ntpd in ntp 4.2.8p4 before 4.2.8p11 drops bad packets before updating the "received" timestamp, which allows remote attackers to cause a denial of service (disrHigh 7.5 · Mar 6, 2018
• CVE-2018-7182 The ctl_getitem method in ntpd in ntp-4.2.8p6 before 4.2.8p11 allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted mode 6 pacHigh 7.5 · Mar 6, 2018
• CVE-2015-3405 ntp-keygen in ntp 4.2.8px before 4.2.8p2-RC2 and 4.3.x before 4.3.12 does not generate MD5 keys with sufficient entropy on big endian machines when the lowest oHigh 7.5 · Aug 9, 2017
• CVE-2015-7871 Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to bypass authentication.Critical 9.8 · Aug 7, 2017
• CVE-2015-7854 Buffer overflow in the password management functionality in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to cause a deniaHigh 8.8 · Aug 7, 2017
• CVE-2015-7853 The datalen parameter in the refclock driver in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to execute arbitrary code or cause a dCritical 9.8 · Aug 7, 2017
• CVE-2015-7849 Use-after-free vulnerability in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to possibly execute arbitrary code oHigh 8.8 · Aug 7, 2017
• CVE-2015-7705 The rate limiting feature in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to have unspecified impact via a large number of crafted reqCritical 9.8 · Aug 7, 2017
• CVE-2015-7704 The ntpd client in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service via a number of crafted "KOD" messages.High 7.5 · Aug 7, 2017
• CVE-2015-7701 Memory leak in the CRYPTO_ASSOC function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (memoHigh 7.5 · Aug 7, 2017
• CVE-2015-7692 The crypto_xmit function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (crash).High 7.5 · Aug 7, 2017
• CVE-2015-7691 The crypto_xmit function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (crash) via crafted pHigh 7.5 · Aug 7, 2017
• CVE-2015-7703 The "pidfile" or "driftfile" directives in NTP ntpd 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77, when ntpd is configured to allow remote configuration, allowsHigh 7.5 · Jul 24, 2017
• CVE-2017-6462 Buffer overflow in the legacy Datum Programmable Time Server (DPTS) refclock driver in NTP before 4.2.8p10 and 4.3.x before 4.3.94 allows local users to have unHigh 7.8 · Mar 27, 2017
• CVE-2017-6460 Stack-based buffer overflow in the reslist function in ntpq in NTP before 4.2.8p10 and 4.3.x before 4.3.94 allows remote servers have unspecified impact via a lHigh 8.8 · Mar 27, 2017
• CVE-2017-6458 Multiple buffer overflows in the ctl_put* functions in NTP before 4.2.8p10 and 4.3.x before 4.3.94 allow remote authenticated users to have unspecified impact vHigh 8.8 · Mar 27, 2017
• CVE-2017-6455 NTP before 4.2.8p10 and 4.3.x before 4.3.94, when using PPSAPI, allows local users to gain privileges via a DLL in the PPSAPI_DLLS environment variable.High 7 · Mar 27, 2017
• CVE-2017-6452 Stack-based buffer overflow in the Windows installer for NTP before 4.2.8p10 and 4.3.x before 4.3.94 allows local users to have unspecified impact via an applicHigh 7.8 · Mar 27, 2017
• CVE-2017-6451 The mx4200_send function in the legacy MX4200 refclock in NTP before 4.2.8p10 and 4.3.x before 4.3.94 does not properly handle the return value of the snprintf High 7.8 · Mar 27, 2017