What’s Vulnerable › Vulnerabilities

CVE-2024-49369: Icinga 2 has a TLS Certificate Validation Bypass for JSON-RPC and HTTP API Connections

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-11-12 · updated 2026-06-17
• Weakness: CWE-295

Description

Icinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. The TLS certificate validation in all Icinga 2 versions starting from 2.4.0 was flawed, allowing an attacker to impersonate both trusted cluster nodes as well as any API users that use TLS client certificates for authentication (ApiUser objects with the client_cn attribute set). This vulnerability has been fixed in v2.14.3, v2.13.10, v2.12.11, and v2.11.12.

Affected products

• Debian Linux: 11.0
• icinga2: from 2.4.0 before 2.11.12; from 2.12.0 before 2.12.11; from 2.13.0 before 2.13.10; from 2.14.0 before 2.14.3 — fixed in 2.11.12, 2.12.11, 2.13.10, 2.14.3

How to fix

Upgrade to a fixed version: icinga2 2.11.12, 2.12.11, 2.13.10, 2.14.3. Check the vendor advisory for mitigations.

References

• https://github.com/Icinga/icinga2/commit/0419a2c36de408e9a703aec0962061ec9a285d3c
• https://github.com/Icinga/icinga2/commit/2febc5e18ae0c93d989e64ebc2a9fd90e7205ad8
• https://github.com/Icinga/icinga2/commit/3504fc7ed688c10d86988e2029a65efc311393fe
• https://github.com/Icinga/icinga2/commit/869a7d6f0fe38c748e67bacc1fbdd42c933030f6
• https://github.com/Icinga/icinga2/commit/8fed6608912c752b337d977f730547875a820831
• https://github.com/Icinga/icinga2/security/advisories/GHSA-j7wq-r9mg-9wpv
• https://icinga.com/blog/2024/11/12/critical-icinga-2-security-releases-2-14-3
• https://lists.debian.org/debian-lts-announce/2024/11/msg00010.html

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