CVE-2025-61909 Icinga 2 signals sent as root to processes based on PID file written by the Icinga 2 daemon user
A local attacker with Icinga daemon privileges can escalate to root by sending signals to arbitrary processes via a writable PID file.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-61909?
CVE-2025-61909 is a medium-severity vulnerability in icinga2, published on 16 Oct 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Icinga 2 is an open source monitoring system. From 2.10.0 to before 2.15.1, 2.14.7, and 2.13.13, the safe-reload script (also used during systemctl reload icinga2) and logrotate configuration shipped with Icinga 2 read the PID of the main Icinga 2 process from a PID file writable by the daemon user, but send the signal as the root user. This can allow the Icinga user to send signals to processes it would otherwise not permitted to. A fix is included in the following Icinga 2 versions: 2.15.1, 2.14.7, and 2.13.13.
Weakness: CWE-250
Which versions are affected by CVE-2025-61909?
It affects 1 product.
Products include Icinga Icinga.
How do I fix CVE-2025-61909?
Upgrade to a fixed version.
Is CVE-2025-61909 being exploited?
There is no known exploitation of CVE-2025-61909 in the wild and no public exploit code.
Other vulnerabilities in icinga2
- CVE-2025-48057 Icinga 2 certificate renewal might incorrectly renew an invalid certificate
- CVE-2020-29663 Security feature bypass in n/a
- CVE-2024-24820 Icinga Director configuration is susceptible to Cross-Site Request Forgery
- CVE-2018-6535 Information disclosure in n/a
- CVE-2020-14004 Path traversal in n/a
Sources
Also known as DEBIAN-CVE-2025-61909, GHSA-pg6g-g99v-mw46, UBUNTU-CVE-2025-61909.