Administrator code execution via crafted MKP upload
Published Mar 25, 2022 · Updated Jul 9, 2026
Code execution in the Checkmk Enterprise Edition web console 1.5.0 through 2.0.0p8 allows remote authenticated users to run code via MKP uploads. The console accepts an extension package and, after administrator activation, installs its contents into the site's local extension tree, where extension code becomes active. An administrator account or hijacked administrator session and package activation are required, and the vendor disputes the issue because administrators are intended to execute extension code.
Summary
What happened
Code execution in the Checkmk Enterprise Edition web console 1.5.0 through 2.0.0p8 allows remote authenticated users to run code via MKP uploads. The console accepts an extension package and, after administrator activation, installs its contents into the site's local extension tree, where extension code becomes active. An administrator account or hijacked administrator session and package activation are required, and the vendor disputes the issue because administrators are intended to execute extension code.
The record
- CVE
- CVE-2021-40905
- Published
- Mar 25, 2022
- Updated
- Jul 9, 2026
- Vendor
- Checkmk GmbH
- Product
- Checkmk
- Classifications
- CWE-434, T1105
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Mar 25, 2022CVE publishedPublication date reported by the CVE source.
- Jul 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.5.0 <2.0.0p9
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Crafted MKP proof of conceptproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo