CVE-2025-45311

High severity, CVSS 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.

Published 2025-11-26. Last modified 2026-06-17.