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No exploitation reportedFix available

CVE-2021-32739

No exploitation reported by the sources we read.

  • Published2021-07-15
  • Fixed in2.12.5 · 2.11.10
  • WeaknessCWE-267 · CWE-269

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-07-1515:15CVE publishedNVD

Versions per branch

NVD
Icinga
BranchAffectedFixed in
2.12≥ 2.12.0, < 2.12.52.12.5
2.x≥ 2.4.0, < 2.11.102.11.10
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • icinga2Ubuntu:26.10all versions · no fixed version listed
  • icinga2Ubuntu:26.04:LTSall versions · no fixed version listed
  • icinga2Ubuntu:25.10all versions · no fixed version listed
  • icinga2Ubuntu:24.04:LTSall versions · no fixed version listed
  • icinga2Ubuntu:22.04:LTSall versions · no fixed version listed
  • icinga2Ubuntu:20.04:LTSall versions · no fixed version listed
  • icinga2Ubuntu:18.04:LTSall versions · no fixed version listed
  • icinga2Ubuntu:16.04:LTSall versions · no fixed version listed

11 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Icinga to 2.12.5 · 2.11.10

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CNACVSS 3.18.8known since 2026-10-23
  • NVDCVSS 3.18.8read 2026-10-23
  • NVDCVSS 2.06.5read 2026-10-23
  • CNAweakness (CWE)CWE-267known since 2026-10-23
  • NVDweakness (CWE)CWE-269read 2026-10-23
  • FIRST EPSSEPSS score1.1 %2026-11-08
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2021-07-15
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2021-32739?

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.

Is CVE-2021-32739 actively exploited?

Active exploitation of CVE-2021-32739 has not been confirmed. Its EPSS score was 1.1% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-32739?

CVE-2021-32739 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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