CVE-2021-37698highCWE-295

CVE-2021-37698: high-severity vulnerability in icinga2

Missing TLS service certificate validation in GelfWriter, ElasticsearchWriter, InfluxdbWriter and Influxdb2Writer

Published · Updated

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 1.4%
exploitation probability
1.4%top 29% of all CVEs
observed exploitation
nono source reports it
Icinga is a monitoring system which checks the availability of network resources, notifies users of outages, and generates performance data for reporting. In versions 2.5.0 through 2.13.0, ElasticsearchWriter, GelfWriter, InfluxdbWriter and Influxdb2Writer do not verify the server's certificate despite a certificate authority being specified. Icinga 2 instances which connect to any of the mentioned time series databases (TSDBs) using TLS over a spoofable infrastructure should immediately upgrade to version 2.13.1, 2.12.6, or 2.11.11 to patch the issue. Such instances should also change the credentials (if any) used by the TSDB writer feature to authenticate against the TSDB. There are no workarounds aside from upgrading.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
Icinga · icinga2
Related CVEs — icinga2

In the same product, most dangerous first.

CVE-2024-49369CRITICALIcinga 2 has a TLS Certificate Validation Bypass for JSON-RPC and HTTP API ConnectionsEPSS 2.9%CVE-2021-32743HIGHPasswords used to access external services inadvertently exposed through APIEPSS 1.8%CVE-2021-32739HIGHResults of queries for ApiListener objects include the ticket salt which allows in turn to steal (more privileged) identitiesEPSS 1.1%CVE-2026-61551HIGHIcinga 2: Stack overflow via deeply nested JSON objectsEPSS 0.9%CVE-2026-61552HIGHIcinga 2 DSL Injection via Unescaped Import Template NameEPSS 0.9%CVE-2026-61550CRITICALIcinga 2: Improper access control for JSON-RPC update certificate messagesEPSS 0.7%
References
https://github.com/Icinga/icinga2/releases/tag/v2.11.11https://github.com/Icinga/icinga2/releases/tag/v2.12.6https://github.com/Icinga/icinga2/releases/tag/v2.13.1https://github.com/Icinga/icinga2/security/advisories/GHSA-cxfm-8j5v-5qr2https://lists.debian.org/debian-lts-announce/2021/11/msg00010.htmlhttps://lists.debian.org/debian-lts-announce/2024/11/msg00010.html