Medium severity · published Sep 13, 2026
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…
6.7
CVSS
0.1%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
FRRouting · FRRouting
before 4.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-42917
CVE.org
https://www.cve.org/CVERecord?id=CVE-2022-42917
bugzilla.suse.com
https://bugzilla.suse.com/show_bug.cgi?id=1204124
frrouting.org
https://frrouting.org/security/cve-2022-42917/
github.com
https://github.com/FRRouting/frr/commit/972cdc560e339d70c0ee5fb70ec636ab78f00bca
github.com
https://github.com/FRRouting/frr/compare/frr-8.4...frr-8.5
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