CVE-2023-23549 DoS via long hostnames
Privileged attackers can cause partial denial of service in the Checkmk UI by submitting excessively long hostnames.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-23549?
CVE-2023-23549 is a low-severity denial of service vulnerability in Checkmk Checkmk, published on 15 Nov 2023. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Improper Input Validation in Checkmk <2.2.0p15, <2.1.0p37, <=2.0.0p39 allows priviledged attackers to cause partial denial of service of the UI via too long hostnames.
Weakness: CWE-1284
Which versions are affected by CVE-2023-23549?
It affects 1 product.
Products include Checkmk Checkmk.
How do I fix CVE-2023-23549?
No fix has been published for CVE-2023-23549 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-23549 being exploited?
There is no known exploitation of CVE-2023-23549 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-q72p-p7xm-7vmr, UBUNTU-CVE-2023-23549.