What is CVE-2022-42917?

CVE-2022-42917 is a medium-severity vulnerability in Frrouting, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.7/10. Published 2026-09-14.

How severe is CVE-2022-42917?

Medium severity. CVSS v3 base score is 6.7 out of 10.

Vulnerability in Frrouting

CVE-2022-42917

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.

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

EPSS: 0.001 (3.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H.

Affected products

Frrouting
N/a

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

Frequently asked questions

What is CVE-2022-42917?: CVE-2022-42917 is a medium-severity vulnerability in Frrouting, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 6.7/10. Published 2026-09-14.
How severe is CVE-2022-42917?: Medium severity. CVSS v3 base score is 6.7 out of 10.