by Kastro
Paper/Archive/CVE-2026-61550

CVE-2026-61550

Icinga icinga2 — Icinga 2: Improper access control for JSON-RPC update certificate messages

EPSS 0.7%CVSS 9.8
critical.is priorityof 100
40
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 52.2.522 × 2010.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
icinga2>= 2.8, < 2.14.9–CNA
icinga2>= 2.15.0, < 2.15.4–CNA
icinga2>= 2.16.0, < 2.16.2–CNA

Scores by source

GitHub_M (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refgithub.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5refgithub.com/Icinga/icinga2/pull/10907refgithub.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0refgithub.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039crefgithub.com/Icinga/icinga2/commit/a6f7cc7a4ef8beed023b24416106822d6940c4c0refgithub.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f81refgithub.com/Icinga/icinga2/releases/tag/v2.14.9refgithub.com/Icinga/icinga2/releases/tag/v2.15.4refgithub.com/Icinga/icinga2/releases/tag/v2.16.2reficinga.com/blog/icinga2-security-release-v2-16-2