What’s Vulnerable › Vulnerabilities

CVE-2025-48057: Icinga 2 certificate renewal might incorrectly renew an invalid certificate

• Severity: critical (CVSS 9.8 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: 2025-05-27 · updated 2026-06-17
• Weakness: CWE-296

Description

Icinga 2 is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. Prior to versions 2.12.12, 2.13.12, and 2.14.6, the VerifyCertificate() function can be tricked into incorrectly treating certificates as valid. This allows an attacker to send a malicious certificate request that is then treated as a renewal of an already existing certificate, resulting in the attacker obtaining a valid certificate that can be used to impersonate trusted nodes. This only occurs when Icinga 2 is built with OpenSSL older than version 1.1.0. This issue has been patched in versions 2.12.12, 2.13.12, and 2.14.6.

Affected products

• icinga2: before 2.12.12; from 2.13.0 before 2.13.12; from 2.14.0 before 2.14.6 — fixed in 2.12.12, 2.13.12, 2.14.6

How to fix

Upgrade to a fixed version: icinga2 2.12.12, 2.13.12, 2.14.6. Check the vendor advisory for mitigations.

References

• https://github.com/Icinga/icinga2/commit/34c93a2542bbe4e9886d15bc17ec929ead1aa152
• https://github.com/Icinga/icinga2/commit/4023128be42b18a011dda71ddee9ca79955b89cb
• https://github.com/Icinga/icinga2/commit/60f75f4a3d5cbb234eb3694ba7e9076a1a5b8776
• https://github.com/Icinga/icinga2/commit/9ad5683aab9eb392c6737ff46c830a945c9e240f
• https://github.com/Icinga/icinga2/commit/9b2c05d0cc09210bdeade77cf9a73859250fc48d
• https://github.com/Icinga/icinga2/security/advisories/GHSA-7vcf-f5v9-3wr6

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