CVE-2021-37698

HIGH
Published Aug 19, 20214y ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Aug 19, 2021 4y ago
Last Modified Jun 17, 2026 1w ago

Description

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 Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-295

Affected Products 4

VendorProductVersionRange
icingaicinga*≥2.5.0  –  <2.11.10
icingaicinga*≥2.12.0  –  <2.12.6
icingaicinga*≥2.13.0  –  <2.13.1
debiandebian_linux9.0any

References 6

  • github.com https://github.com/Icinga/icinga2/releases/tag/v2.11.11
    Release NotesThird Party Advisory
  • github.com https://github.com/Icinga/icinga2/releases/tag/v2.12.6
    Release NotesThird Party Advisory
  • github.com https://github.com/Icinga/icinga2/releases/tag/v2.13.1
    Release NotesThird Party Advisory
  • github.com https://github.com/Icinga/icinga2/security/advisories/GHSA-cxfm-8j5v-5qr2
    Third Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2021/11/msg00010.html
    Mailing ListThird Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2024/11/msg00010.html

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.