CVE-2019-11331: Ntp

High severity, CVSS 8.1. EPSS: 2.6% chance of exploitation in the next 30 days.

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 Ntp: affected versions not specified

Published 2019-04-18. Last modified 2026-06-17.