CVE-2023-2020 Unauthorized scheduling of downtimes via REST API
Unauthorized users can schedule downtimes for any host via the REST API due to insufficient permission checks in Checkmk.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-2020?
CVE-2023-2020 is a medium-severity missing authorization vulnerability in Checkmk Checkmk, published on 18 Apr 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Insufficient permission checks in the REST API in Tribe29 Checkmk <= 2.1.0p27 and <= 2.2.0b4 (beta) allow unauthorized users to schedule downtimes for any host.
Which versions are affected by CVE-2023-2020?
It affects 1 product.
Products include Checkmk Checkmk.
How do I fix CVE-2023-2020?
No fix has been published for CVE-2023-2020 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2023-2020 being exploited?
There is no known exploitation of CVE-2023-2020 in the wild and no public exploit code.
Other vulnerabilities in Checkmk Checkmk
- CVE-2025-39666 omd: Local privilege escalation when executing omd commands as root
- CVE-2024-8606 Fix 2FA bypass via RestAPI
- CVE-2022-46836 PHP code injection in watolib
- CVE-2025-32919 Privilege Escalation in Windows License plugin for Checkmk Windows Agent
- CVE-2024-28827 Privilege escalation in Windows agent
Sources
Also known as GHSA-w7j6-p4c4-j78m, UBUNTU-CVE-2023-2020.