Vulnerability record · CVE-2021-32739 · published 15 July 2021
CVE-2021-32739: Icinga improper privilege management vulnerability
Icinga · Icinga
Icinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. From version 2.4.0 through version 2.12.4, a vulnerability exists that may allow privilege escalation for authenticated API users. With a read-ony user's credentials, an attacker can view most attributes of all config objects including `ticket_salt` of `ApiListener`. This salt is enough to compute a ticket for every possible common name (CN). A ticket, the master node's certificate, and a self-signed certificate are enough to successfully request the desired certificate from Icinga. That certificate may in turn be used to steal an endpoint or API user's identity. Versions 2.12.5 and 2.11.10 both contain a fix the vulnerability. As a workaround, one may either specify queryable types explicitly or filter out ApiListener objects.
Description
Icinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. From version 2.4.0 through version 2.12.4, a vulnerability exists that may allow privilege escalation for authenticated API users. With a read-ony user's credentials, an attacker can view most attributes of all config objects including `ticket_salt` of `ApiListener`. This salt is enough to compute a ticket for every possible common name (CN). A ticket, the master node's certificate, and a self-signed certificate are enough to successfully request the desired certificate from Icinga. That certificate may in turn be used to steal an endpoint or API user's identity. Versions 2.12.5 and 2.11.10 both contain a fix the vulnerability. As a workaround, one may either specify queryable types explicitly or filter out ApiListener objects.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.
References
| Link | Tags |
|---|---|
| https://github.com/Icinga/icinga2/security/advisories/GHSA-98wp-jc6q-x5q5 | ExploitThird Party Advisory |
| https://icinga.com/blog/2021/07/02/releasing-icinga-2-12-5-2-11-10/ | Broken LinkVendor Advisory |
| https://lists.debian.org/debian-lts-announce/2021/11/msg00010.html | Mailing ListThird Party Advisory |
| https://github.com/Icinga/icinga2/security/advisories/GHSA-98wp-jc6q-x5q5 | ExploitThird Party Advisory |
| https://icinga.com/blog/2021/07/02/releasing-icinga-2-12-5-2-11-10/ | Broken LinkVendor Advisory |
| https://lists.debian.org/debian-lts-announce/2021/11/msg00010.html | Mailing ListThird Party Advisory |
| https://lists.debian.org/debian-lts-announce/2024/11/msg00010.html |
Track CVE-2021-32739 inside VULONE
Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.
Related vulnerabilities
Same products first, then exploited flaws of the same weakness class.
Source: NIST National Vulnerability Database (record CVE-2021-32739), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.
