CVE-2025-61909: Icinga 2 signals sent as root to processes based on PID file written by the Icinga 2 daemon user
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.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2025-61909?
The severity of CVE-2025-61909 is considered medium due to potential unauthorized modifications to the Icinga 2 PID file.
How do I fix CVE-2025-61909?
To fix CVE-2025-61909, upgrade Icinga 2 to version 2.15.1 or later.
What versions of Icinga 2 are affected by CVE-2025-61909?
CVE-2025-61909 affects Icinga 2 versions from 2.10.0 to before 2.15.1, including 2.14.7 and 2.13.13.
What are the potential impacts of CVE-2025-61909?
The potential impacts of CVE-2025-61909 include unauthorized access to the monitoring system and possible Denial of Service (DoS) scenarios.
Is there a workaround for CVE-2025-61909 if I cannot upgrade immediately?
As a workaround for CVE-2025-61909, ensure that the PID file's permissions are properly configured to restrict unauthorized write access.