CVE-2025-45311 Privilege escalation in n/a
Attackers with limited sudo privileges can perform arbitrary root operations via fail2ban-client, though this behavior is disputed as intended functionality.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-45311?
CVE-2025-45311 is a high-severity vulnerability in n/a, published on 26 Nov 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-266
Which versions are affected by CVE-2025-45311?
How do I fix CVE-2025-45311?
No fix has been published for CVE-2025-45311 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-45311 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-45311 exists.
Sources
Also known as GHSA-4w79-7ch5-4xhw.