Description
Insecure permissions in fail2ban-client v0.11.2 allows attackers with limited sudo privileges to perform arbitrary operations as root. NOTE: this is disputed by multiple parties because the action for a triggered rule can legitimately be an arbitrary operation as root. Thus, the software is behaving in accordance with its intended privilege model.
References (4)
Core 4
Core References
Various Sources
https://packetstorm.news/files/id/189989
Issue Tracking
https://github.com/fail2ban/fail2ban/issues/4110
Scores
CVSS v3
8.8
EPSS
0.0032
EPSS Percentile
23.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
total
Details
CWE
CWE-266
Status
published
Published
Nov 26, 2025
Tracked Since
Feb 18, 2026