Improper Certificate Validation in Icinga - CVE-2020-29663
Published: December 15, 2020 / Updated: June 29, 2026
Vulnerability identifier: #VU135835
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2020-29663
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Icinga
Affected software:
Icinga
Icinga
Detailed vulnerability description
The vulnerability allows a remote user to bypass certificate revocation checks.
The vulnerability exists due to improper certificate validation in the ApiListener certificate renewal logic when processing certificate renewal requests. A remote user can request automatic renewal of a revoked certificate to bypass certificate revocation checks.
Only setups using external certificate signing are affected, and exploitation requires that a CRL is configured and that the revoked certificate is eligible for automatic renewal because it was issued before 2017 or expires in less than 30 days.
How to mitigate CVE-2020-29663
Install security update from vendor's website.