---
cve: "CVE-2025-39666"
severity: "CRITICAL"
cvss: 9.3
epss: "0.1%"
vendor: "Checkmk GmbH"
kev: false
exploited: false
published: "2026-04-07 12:09:07"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-28T23:06:29+01:00"
---

# CVE-2025-39666

> 9.3 CRITICAL

## Beschreibung

Local privilege escalation in Checkmk 2.2.0 (EOL), Checkmk 2.3.0 before 2.3.0p46, Checkmk 2.4.0 before 2.4.0p25, and Checkmk 2.5.0 (beta) before 2.5.0b3 allows a site user to escalate their privileges to root, by manipulating files in the site context that are processed when the `omd` administrative command is run by root.

## CNA-Record (Kanon, cvelistV5)

- CNA: **Checkmk**
- State: PUBLISHED
- Stand: 2026-04-07 13:18:19
- CNA-CVSS: **9.3** (`CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Hoch | good |
| UI Interaktion | Keine | bad |

## Schwachstellen-Klasse

- **CWE-426** — Untrusted Search Path
  The product searches for critical resources using an externally-supplied search path that can point to resources that are not under the product's direct control.
- **CWE-829** — Inclusion of Functionality from Untrusted Control Sphere
  The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere.

## Angriffsmuster (CAPEC)

- [CAPEC-38 — Leveraging/Manipulating Configuration File Search Paths](https://capec.mitre.org/data/definitions/38.html) _(Severity: Very High)_

## ATT&CK-Techniken

- [T1574.007 — Hijack Execution Flow: Path Interception by PATH Environment](https://attack.mitre.org/techniques/T1574/007/)
- [T1574.009 — Hijack Execution Flow: Path Interception by Unquoted Path](https://attack.mitre.org/techniques/T1574/009/)

## BSI-Hinweise (deutsch)

- [Checkmk: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-0983) — _BSI-Einstufung: hoch_
  Ein Angreifer kann mehrere Schwachstellen in Checkmk ausnutzen, um seine Privilegien zu erhöhen, und um einen Cross-Site Scripting Angriff durchzuführen.

## Referenzen

- <https://checkmk.com/werk/18891>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2025-39666/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_