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Vulnerability record · CVE-2019-11331 · published 18 April 2019

CVE-2019-11331: Ntp vulnerability

Ntp · Ntp

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 attackers to conduct off-path attacks.

8.1 CVSS 3.0 High EPSS 2.6% · top 14.9%
8.1CVSS 3.0 base score, v2 6.8
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

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 attackers to conduct off-path attacks.

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/108010 Third Party Advisory
https://support.f5.com/csp/article/K09940637
https://support.f5.com/csp/article/K09940637?utm_source=f5support&amp%3Butm_medium=RSS
https://tools.ietf.org/html/draft-gont-ntp-port-randomization-00 Third Party Advisory
http://www.securityfocus.com/bid/108010 Third Party Advisory
https://support.f5.com/csp/article/K09940637
https://support.f5.com/csp/article/K09940637?utm_source=f5support&amp%3Butm_medium=RSS
https://tools.ietf.org/html/draft-gont-ntp-port-randomization-00 Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2018-12327Ntp out-of-bounds write vulnerabilityStack-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 v…EPSS 28%9.8CVE-2018-7183Ntp out-of-bounds write vulnerabilityBuffer 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 …EPSS 10%9.8CVE-2015-7853Ntp classic buffer overflow vulnerabilityThe 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 o…EPSS 12%9.8CVE-2015-7871ntpd Crypto-NAK packets bypass authenticationntpd in NTP 4.2.x before 4.2.8p4 and 4.3.x before 4.3.77 mishandles Crypto-NAK packets, allowing remote attackers to bypass authentication. Because N…EPSS 82%analysed9.8CVE-2015-7705Ntp improper input validation vulnerabilityThe 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 …EPSS 12%8.8CVE-2015-7849Ntp use after free vulnerabilityUse-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 arbit…EPSS 17%8.8CVE-2015-7854Ntp classic buffer overflow vulnerabilityBuffer 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 ca…EPSS 15%8.8CVE-2017-6460Ntp memory buffer overflow vulnerabilityStack-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 imp…EPSS 2.7%

Source: NIST National Vulnerability Database (record CVE-2019-11331), CISA KEV, FIRST EPSS (scores of 2026-10-09). This page is refreshed as NVD updates the record.