{"id":"CVE-2026-61550","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-61550","generatedAt":"2026-09-20T11:40:59.163Z","title":"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.","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.","published":"2026-09-18T18:17:08.000Z","lastModified":"2026-09-18T18:17:08.000Z","status":"Received","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-862"],"affected":[],"epss":{"score":0.0037,"percentile":0.30875,"date":"2026-09-19","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0","source":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039c","source":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/commit/a6f7cc7a4ef8beed023b24416106822d6940c4c0","source":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f81","source":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/pull/10907","source":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/releases/tag/v2.14.9","source":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/releases/tag/v2.15.4","source":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/releases/tag/v2.16.2","source":"security-advisories@github.com"},{"url":"https://github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5","source":"security-advisories@github.com"},{"url":"https://icinga.com/blog/icinga2-security-release-v2-16-2","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-61550","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}