Improper access control in Icinga - CVE-2021-32739
Published: July 15, 2021 / Updated: June 29, 2026
Vulnerability identifier: #VU135834
CSH Severity: Medium
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-32739
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to steal more privileged identities.
The vulnerability exists due to improper access control in ApiListener object query results when handling API object queries. A remote user can query ApiListener objects to obtain the ticket salt and request a certificate for an arbitrary common name to steal more privileged identities.
Exploitation requires credentials for an API user with permission to query objects.
Affected software
Icinga
Gentoo Linux
net-analyzer/icinga2
Gentoo Linux
net-analyzer/icinga2
How to mitigate CVE-2021-32739
Install security update from vendor's website.
Icinga - addressed in versions 2.11.10, 2.12.5
net-analyzer/icinga2 - update to 2.14.3
net-analyzer/icinga2 - update to 2.14.3