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CVE-2021-40905

HIGH
8.8
CVSS Score
Published: March 25, 2022 at 10:20 PM UTC
Updated: July 9, 2026 at 01:17 AM UTC
1 product affected across 1 vendorCheckmk

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Severity
HIGH8.8
Exploit prediction
EPSS 3%
SSVC
No known exploit

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Checkmk· Checkmk
95%
1.5.0 ≤ v < 2.0.01.5.0 ≤ v < 2.0.0p91.5.02.0.02.0.0 b12.0.0 b22.0.0 b32.0.0 b42.0.0 b52.0.0 b62.0.0 b72.0.0 b82.0.0 i12.0.0 p12.0.0 p102.0.0 p112.0.0 p122.0.0 p132.0.0 p142.0.0 p152.0.0 p162.0.0 p172.0.0 p22.0.0 p32.0.0 p42.0.0 p52.0.0 p62.0.0 p72.0.0 p82.0.0 p9
Affected range stops below 2.0.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.0p9, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

Source: [email protected]
http://checkmk.com
ExploitThird Party Advisory
Source: [email protected]
https://github.com/Edgarloyola/CVE-2021-40905
Source: cverecord
https://docs.checkmk.com/latest/en/mkps.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-434

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