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CVE-2021-40905

HighPublished

The web management console of CheckMK Enterprise Edition (versions 1.5.0 to 2.0.0p9) does not properly sanitise the uploading of ".mkp" files, which are...

Published: Mar 25, 2022
Updated: Jul 9, 2026
Assigning CNA: mitre
Evidence observed: Aug 5, 2026

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS probability estimate

3.0%

Low · next 30 days

Percentile: 86.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

The web management console of CheckMK Enterprise Edition (versions 1.5.0 to 2.0.0p9) does not properly sanitise the uploading of ".mkp" files, which are Extension Packages, making remote code execution possible. Successful exploitation requires access to the web management interface, either with valid credentials or with a hijacked session of a user with administrator role. NOTE: the vendor states that this is the intended behavior: admins are supposed to be able to execute code in this manner.

Sources

CVE-2021-40905PoC
Proof-of-concept exploit for CVE-2021-40905, a remote code execution vulnerability in CheckMK Management Web Console via crafted .mkp extension packages.

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