# CVE-2026-61550

Unauthenticated attacker can replace certs and fully compromise Icinga 2 nodes via TCP/5665.

- Page: https://www.vulneraibility.com/cve/CVE-2026-61550
- CVSS: 9.8
- Known exploited: not in CISA KEV as of our last sync
- EPSS: 0.67% (percentile 52.3)
- CISA SSVC: exploitation none, automatable yes, technical impact total (assessed 2026-09-21)
- Weakness: CWE-862
- Also known as: GHSA-vj39-ww8j-vvx5
- Published: 2026-09-18

## Affected versions

- Icinga icinga2: affected >= 2.8 and < 2.14.9; >= 2.15.0 and < 2.15.4; >= 2.16.0 and < 2.16.2

A version outside these ranges is not a statement that it is unaffected.

## Impact

Unauthenticated network attacker connecting to TCP/5665 can replace node and CA certificates, impersonate trusted nodes, and take full control of the node.

## Action

Immediate action required

## Recommendation

Upgrade to 2.14.9, 2.15.4 or 2.16.2 and restrict access to TCP/5665

## References

- [other] https://github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5
- [other] https://github.com/Icinga/icinga2/pull/10907
- [other] https://github.com/Icinga/icinga2/commit/4b7fb3405f4616a24b2b55e20f603a56b7dd6ad0
- [other] https://github.com/Icinga/icinga2/commit/6c2e0db3819f859910a4ae265461cb51b1d2039c
- [other] https://github.com/Icinga/icinga2/commit/a6f7cc7a4ef8beed023b24416106822d6940c4c0
- [other] https://github.com/Icinga/icinga2/commit/d37b0cfd7d9595ae2f02fadb3d724c98d8620f81
- [other] https://github.com/Icinga/icinga2/releases/tag/v2.14.9
- [other] https://github.com/Icinga/icinga2/releases/tag/v2.15.4
- [other] https://github.com/Icinga/icinga2/releases/tag/v2.16.2
- [other] https://icinga.com/blog/icinga2-security-release-v2-16-2

---
Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.