CVE-2015-1798: Ntp

Low severity, CVSS 1.8. EPSS: 2.2% chance of exploitation in the next 30 days.

The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p2 requires a correct MAC only if the MAC field has a nonzero length, which makes it easier for man-in-the-middle attackers to spoof packets by omitting the MAC.

Affected products

• Ntp Ntp: up to and including 4.2.7p444

Published 2015-04-08. Last modified 2026-06-17.