CVE-2015-8138: Ntp

Medium severity, CVSS 5.3. EPSS: 6.3% chance of exploitation in the next 30 days.

NTP before 4.2.8p6 and 4.3.x before 4.3.90 allows remote attackers to bypass the origin timestamp validation via a packet with an origin timestamp set to zero.

Affected products

• Ntp Ntp: up to and including 4.2.8; version 4.3.0 only; version 4.3.1 only; version 4.3.2 only; version 4.3.3 only; version 4.3.4 only; …

Published 2017-01-30. Last modified 2026-06-17.