CVE-2022-42917: Frrouting

Medium severity, CVSS 6.7. EPSS: 0.1% chance of exploitation in the next 30 days.

In FRRouting FRR before 8.5, the service user (usually frr) can escalate its privileges to root by monitoring the configuration directory (/etc/frr) and replacing config files upon creation with, for example, symlinks to change the ownership of arbitrary files. This is a TOCTOU Race Condition caused by a combination of touch and chown.

Affected products

• Frrouting Frrouting: before 4.5 (fixed in 4.5)

Published 2026-09-14. Last modified 2026-09-22.