---
cve: "CVE-2026-61550"
severity: "CRITICAL"
cvss: 9.8
epss: "0.4%"
vendor: "Icinga"
kev: false
exploited: false
published: "2026-09-18 18:17:08"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-23T11:49:52+02:00"
---

# CVE-2026-61550

> 9.8 CRITICAL · 🧪 PoC

## Beschreibung

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-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 75b2d7a1c9eacb58e3e3025a6e5f4f573f922d23 (Commit)
- b4ec974518c9e5f5ca861169442ac3780e675767 (Commit)

## Referenzen

- <https://github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5>
- <https://github.com/Icinga/icinga2/pull/10907>
- <https://github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0>
- <https://github.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039c>
- <https://github.com/Icinga/icinga2/commit/a6f7cc7a4ef8beed023b24416106822d6940c4c0>
- <https://github.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f81>
- <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://icinga.com/blog/icinga2-security-release-v2-16-2>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-61550) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_