Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2021-37698

Improper Certificate Validation

Published: Aug 19, 2021 | Modified: Nov 03, 2025
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N
RedHat/V2
RedHat/V3
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2021-37698
CWEhttps://cwe.mitre.org/data/definitions/295.html

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 servers 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.

Weakness

The product does not validate, or incorrectly validates, a certificate.

Affected Software

NameVendorStart VersionEnd Version
IcingaIcinga2.5.0 (including)2.11.10 (excluding)
IcingaIcinga2.12.0 (including)2.12.6 (excluding)
IcingaIcinga2.13.0 (including)2.13.1 (excluding)
Icinga2Ubuntubionic*
Icinga2Ubuntufocal*
Icinga2Ubuntuhirsute*
Icinga2Ubuntuimpish*
Icinga2Ubuntukinetic*
Icinga2Ubuntutrusty*
Icinga2Ubuntuupstream*
Icinga2Ubuntuxenial*

Potential Mitigations

References

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