Vulnerability Description
Icinga 2 is an open source monitoring system. From 2.8 until 2.14.9, 2.15.4, and 2.16.2, certificate update JSON-RPC message handling does not validate that the sender is a trusted endpoint. An unauthenticated network attacker able to connect to TCP port 5665 can replace the node certificate and trusted CA certificate, impersonate a trusted node, and take control of the node. This issue is fixed in versions 2.14.9, 2.15.4, and 2.16.2.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad
- https://github.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039
- https://github.com/Icinga/icinga2/commit/a6f7cc7a4ef8beed023b24416106822d6940c4c
- https://github.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f8
- https://github.com/Icinga/icinga2/pull/10907
- https://github.com/Icinga/icinga2/releases/tag/v2.14.9
- https://github.com/Icinga/icinga2/releases/tag/v2.15.4
- https://github.com/Icinga/icinga2/releases/tag/v2.16.2
- https://github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5
- https://icinga.com/blog/icinga2-security-release-v2-16-2
FAQ
What is CVE-2026-61550?
CVE-2026-61550 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Icinga 2 is an open source monitoring system. From 2.8 until 2.14.9, 2.15.4, and 2.16.2, certificate update JSON-RPC message handling does not validate that the sender is a trusted endpoint. An unauth...
How severe is CVE-2026-61550?
CVE-2026-61550 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-61550?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.