CVE-2016-1549: Ntp

Medium severity, CVSS 6.5. EPSS: 3.1% chance of exploitation in the next 30 days.

A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and modify a victim's clock.

Affected products

• Ntp Ntp: version 4.2.8 only

Published 2017-01-06. Last modified 2026-06-17.