What’s Vulnerable › Vulnerabilities

CVE-2025-61908: Icinga 2 Denial of Service (DoS) By Dereferencing Invalid Reference

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-16 · updated 2026-10-09
• Weakness: CWE-476

Description

Icinga 2 is an open source monitoring system. From 2.10.0 to before 2.15.1, 2.14.7, and 2.13.13, when creating an invalid reference, such as a reference to null, dereferencing results in a segmentation fault. This can be used by any API user with access to an API endpoint that allows specifying a filter expression to crash the Icinga 2 daemon. A fix is included in the following Icinga 2 versions: 2.15.1, 2.14.7, and 2.13.13.

Affected products

• icinga2: from 2.10.0 before 2.13.13; from 2.14.0 before 2.14.7; from 2.15.0 before 2.15.1 — fixed in 2.13.13, 2.14.7, 2.15.1

How to fix

Upgrade to a fixed version: icinga2 2.13.13, 2.14.7, 2.15.1. Check the vendor advisory for mitigations.

References

• https://github.com/Icinga/icinga2/pull/6521
• https://github.com/Icinga/icinga2/security/advisories/GHSA-v9jg-xqhj-f43g
• https://icinga.com/blog/releasing-icinga-2-v2-15-1-2-14-7-and-2-13-13-and-icinga-db-web-v1-2-3-and-1-1-4

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