CVE-2026-61550
Icinga 2: Improper access control for JSON-RPC update certificate messages
CVE-2026-61550 is a critical vulnerability (CVSS 9.8) in Icinga Icinga2, published September 18, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.67%, the 52nd percentile. Fixed in icinga2 2.14.6-1+deb13u1.
- Severity
- 9.8 CriticalCVSS 3.1, CVE List
- Exploit chance
- 0.67%EPSS, 52nd percentile
- Exploitation
- None knownNot on CISA’s or ENISA’s lists
- Fixed in
2.14.6-1+deb13u1icinga2 +7 more
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
Discussion
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
icinga2Debian:12 | All versions, plus listed versions 2.13.6-22.13.6-2+deb12u12.13.6-2+deb12u22.13.7-12.13.7-1~exp1 Show 27 moreShow less2.13.8-12.14.0-1~exp12.14.1-12.14.2-12.14.2-1+loong642.14.3-12.14.4-12.14.5-12.14.6-12.15.0-12.15.0-1~exp12.15.1-12.15.2-12.15.2-22.16.0-12.16.0-22.16.0-3~exp12.16.0-3~exp22.16.0-3~exp32.16.0-3~exp42.16.1-12.16.1-1~exp12.16.2-12.16.2-22.16.3-12.16.4-12.16.5-1 | None known |
icinga2Debian:13 | before 2.14.6-1+deb13u1, plus listed versions 2.14.6-1 | 2.14.6-1+deb13u1 |
icinga2Debian:14 | before 2.16.2-1, plus listed versions 2.14.6-12.15.0-12.15.0-1~exp12.15.1-12.15.2-1 Show 9 moreShow less2.15.2-22.16.0-12.16.0-22.16.0-3~exp12.16.0-3~exp22.16.0-3~exp32.16.0-3~exp42.16.1-12.16.1-1~exp1 | 2.16.2-1 |
icinga2Ubuntu:18.04:LTS | All versions, plus listed versions 2.7.0-12.8.1-0ubuntu2 | None known |
icinga2Ubuntu:20.04:LTS | All versions, plus listed versions 2.10.5-1build12.11.2-12.11.2-1ubuntu12.11.2-1ubuntu22.11.2-1ubuntu3 | None known |
icinga2Ubuntu:22.04:LTS | All versions, plus listed versions 2.12.3-12.13.1-12.13.2-12.13.2-1build12.13.2-1build2 | None known |
icinga2Ubuntu:24.04:LTS | All versions, plus listed versions 2.13.8-12.14.1-12.14.2-12.14.2-1build12.14.2-1build2 | None known |
icinga2Ubuntu:26.04:LTS | All versions, plus listed versions 2.15.0-12.15.1-1 | None known |
What each source reports
CVE List Score used
Icinga 2: Improper access control for JSON-RPC update certificate messages
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.
- Record
CVE-2026-61550- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-862
- Updated
- 2026-11-02
EUVDEUVD-2026-83208
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.
- Record
EUVD-2026-83208- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-61550- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-862
- Updated
- 2026-11-02
OSV
Icinga 2: Improper access control for JSON-RPC update certificate messages
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.
- Record
CVE-2026-61550- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-862
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-61550
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.
- Record
DEBIAN-CVE-2026-61550- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-61550
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.
- Record
UBUNTU-CVE-2026-61550- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-04
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | OSV | |
| first indexed | CVE List, EUVD, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
References
github.com/Icinga/icinga2/security/advisories/GHSA-vj39-ww8j-vvx5
Show 9 moreShow less
icinga.com/blog/icinga2-security-release-v2-16-2
nvd.nist.gov/vuln/detail/CVE-2026-61550
security-tracker.debian.org/tracker/CVE-2026-61550
ubuntu.com/security/CVE-2026-61550
cve.org/CVERecord?id=CVE-2026-61550