CVE-2025-45311

8.8 highEPSS 0.4%

High (8.8). EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

8.8 high

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 33% of CVEs (scores of 2026-10-31)
CWE: CWE-266
Published: 2025-11-26
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

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

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