What’s Vulnerable › Vulnerabilities
CVE-2019-11331
- Severity: high (CVSS 8.1 v3.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.6% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2019-04-18 · updated 2026-06-17
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.
Affected products
- NTP: all versions
References
- http://www.securityfocus.com/bid/108010
- https://support.f5.com/csp/article/K09940637
- https://support.f5.com/csp/article/K09940637?utm_source=f5support&%3Butm_medium=RSS
- https://tools.ietf.org/html/draft-gont-ntp-port-randomization-00
- http://www.securityfocus.com/bid/108010
- https://support.f5.com/csp/article/K09940637
- https://support.f5.com/csp/article/K09940637?utm_source=f5support&%3Butm_medium=RSS
- https://tools.ietf.org/html/draft-gont-ntp-port-randomization-00
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