CVE-2025-45311

CVSS 8.8 HIGHEPSS 0.3%CWE-266

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 8.8EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

26 Nov 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

n/a · n/a

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References

https://gist.github.com/R-Security/1c707a08f9c7f9a91d9d84b5010aaed2 https://github.com/fail2ban/fail2ban/issues/4110 https://packetstorm.news/files/id/189989 http://www.openwall.com/lists/oss-security/2025/12/03/2