What’s Vulnerable › Vulnerabilities

CVE-2025-61909: Icinga 2 signals sent as root to processes based on PID file written by the Icinga 2 daemon user

• Severity: medium (CVSS 4.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-16 · updated 2026-10-09
• Weakness: CWE-250

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.

Affected products

• icinga2: from 2.10.0 before 2.13.13; from 2.14.0 before 2.14.7; 2.15.0 — fixed in 2.13.13, 2.14.7

How to fix

Upgrade to a fixed version: icinga2 2.13.13, 2.14.7. Check the vendor advisory for mitigations.

References

• https://github.com/Icinga/icinga2/commit/51ec73cbd922a76fc0f60e1d8d33acd7caa5d587
• https://github.com/Icinga/icinga2/issues/10527
• https://github.com/Icinga/icinga2/security/advisories/GHSA-pg6g-g99v-mw46
• https://icinga.com/blog/releasing-icinga-2-v2-15-1-2-14-7-and-2-13-13-and-icinga-db-web-v1-2-3-and-1-1-4

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