Medium severity · published Dec 18, 2025
CVE-2025-65000
Exposure of SSH Private Keys in Remote Alert Handlers (Linux) Rule
5.3
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CH
Checkmk · Checkmk GmbH
2.4.0 before 2.4.0p18; 2.3.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-65000
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-65000
Vendor Advisory
https://checkmk.com/werk/19030
More from Checkmk
8.8
CVE-2026-24096
Insufficient permission validation on multiple REST API Quick Setup endpoints
8.6
CVE-2026-14452
Open redirect and XSS via reset_url parameter
7.8
CVE-2024-47091
Privilege escalation via mk_mysql agent plugin on Windows
7.6
CVE-2026-33456
Potential livestatus injection in notification test
7.4
CVE-2024-6572
Improper host key checking in active check 'Check SFTP Service' and special agent 'VNX quotas and filesystem'