CVE-2021-40905

8.8 highEPSS 3.0%

High (8.8). EPSS 3.0% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

8.8 high

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

EPSS: 3.0% chance of exploitation in the next 30 days; higher than 87% of CVEs (scores of 2026-10-31)
CWE: CWE-434
Published: 2022-03-25
Modified: 2026-07-09
Record from: the NVD, synced 2026-10-19

Affected

checkmk:checkmk
tribe29:checkmk

References

https://docs.checkmk.com/latest/en/mkps.html
https://github.com/Edgarloyola/CVE-2021-40905
https://github.com/Edgarloyola/CVE-2021-40905

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