CVE-2021-37698

mediumpriority · track · 30EPSS 0.014 · 72 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.38% (72nd) EPSS

CVSS 5 · medium

Is it mine?

14 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · security-advisories@github.comexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-295USprimary

affected products (14)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Gentoo Linuxall versionscert_bundDEcpe:/o:gentoo:linux:-
Open Source Icinga <2.11.11all versionscert_bundDE
Open Source Icinga <2.12.6all versionscert_bundDE
Open Source Icinga <2.13.1all versionscert_bundDE
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Open Source Icinga< 2.11.11cert_bundDE
Open Source Icinga< 2.12.6cert_bundDE
Open Source Icinga< 2.13.1cert_bundDE
Icinga icinga2≤ 2.5.0, ≤ 2.13.0enisa_euvdEU
debian debian linux= 9.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
icinga icinga2.12.0 → 2.12.6nvdUScpe:2.3:a:icinga:icinga:*:*:*:*:*:*:*:*
icinga icinga2.13.0 → 2.13.1nvdUScpe:2.3:a:icinga:icinga:*:*:*:*:*:*:*:*
icinga icinga2.5.0 → 2.11.10nvdUScpe:2.3:a:icinga:icinga:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2022-1851Icinga: Schwachstelle ermöglicht Offenlegung von InformationenDeutsch2021-08-19csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Icinga ausnutzen, um Informationen offenzulegen.

also known as (2)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd NVD CVE.org MITRE

published 2021-08-19modified 2026-06-17

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+1891 more

references (19)

External citations — patches, advisories, analysis.

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