Checkmk Windows-Agent-Plugins: Schwachstelle ermöglicht Denial of Service
WID-SEC-2026-1701 · first 28.05.2026 · updated 28.05.2026 · CVSS 6,2
What it is about
Checkmk ist eine IT-Monitoring-Software. Ein lokaler Angreifer kann eine Schwachstelle in Checkmk ausnutzen, um einen Denial of Service Angriff durchzuführen.
Under what conditions?
Only with access to the device or an account on it. Often the second step after a phishing email.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Denial of Service Angriff durchzuführen
Am I affected?
Affected according to the BSI:
- Checkmk Checkmk <2.4.0p30
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Checkmk Checkmk 2.4.0p30
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- CheckMK Werk 19208 vom 2026-05-27 checkmk.com
- Github Security Advisory GHSA-jjg7-2v4v-x38h github.com
CVE: CVE-2024-3651
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.