---
id: CVE-2025-65000
title: >-
  SSH private keys of the "Remote alert handlers (Linux)" rule were exposed in
  the rule page's HTML source in Checkmk <= 2.4.0p18 and all versions of Checkmk
  2.3.0
summary: >-
  SSH private keys of the "Remote alert handlers (Linux)" rule were exposed in
  the rule page's HTML source in Checkmk <= 2.4.0p18 and all versions of Checkmk
  2.3.0. This potentially allowed unauthorized triggering of predefined alert
  handl…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-212
vendor: checkmk
product: checkmk
affected:
  - checkmk = 2.2.0
  - checkmk = 2.3.0
  - checkmk = 2.4.0
published: '2025-12-18'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T11:10:00.203'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-65000'
references:
  - url: 'https://checkmk.com/werk/19030'
    label: security@checkmk.com
tags:
  - nvd
epss: 0.00216
epssPercentile: 0.11139
ingestedAt: '2026-10-13T11:23:51.132Z'
---

## Overview

SSH private keys of the "Remote alert handlers (Linux)" rule were exposed in the rule page's HTML source in Checkmk <= 2.4.0p18 and all versions of Checkmk 2.3.0. This potentially allowed unauthorized triggering of predefined alert handlers on hosts where the handler was deployed.

## Affected

- `checkmk = 2.2.0`
- `checkmk = 2.3.0`
- `checkmk = 2.4.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.