CVE-2022-27881: OpenBSD

High severity, CVSS 7.5. EPSS: 1.9% chance of exploitation in the next 30 days.

engine.c in slaacd in OpenBSD 6.9 and 7.0 before 2022-02-21 has a buffer overflow triggerable by an IPv6 router advertisement with more than seven nameservers. NOTE: privilege separation and pledge can prevent exploitation.

Affected products

• OpenBSD OpenBSD: version 6.9 only; version 7.0 only

Published 2022-03-25. Last modified 2026-06-17.