CVE-2025-45311 (CVSS 8.8)

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.

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CVSS v3.1 Score

8.8

HIGH

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

Weakness Type (CWE)

CWE-266 CWE-266

References

Other 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

Frequently Asked Questions

What is CVE-2025-45311? +

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. It has a CVSS v3.1 base score of 8.8 (HIGH).

How severe is CVE-2025-45311? +

CVE-2025-45311 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2025-45311? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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