Checkmk up to 2.3.x/2.4.0p17 SSH Private Key improper removal of sensitive information before storage or transfer

CVSS Meta Temp Score
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CTI Interest Score
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4.7$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Checkmk up to 2.3.x/2.4.0p17. Affected is an unknown function of the component SSH Private Key Handler. The manipulation results in improper removal of sensitive information before storage or transfer. This vulnerability is known as CVE-2025-65000. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Checkmk up to 2.3.x/2.4.0p17. It has been classified as problematic. Affected is an unknown functionality of the component SSH Private Key Handler. The manipulation with an unknown input leads to a improper removal of sensitive information before storage or transfer vulnerability. CWE is classifying the issue as CWE-212. The product stores, transfers, or shares a resource that contains sensitive information, but it does not properly remove that information before the product makes the resource available to unauthorized actors. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is shared for download at checkmk.com. This vulnerability is traded as CVE-2025-65000 since 11/12/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability scanner Nessus provides a plugin with the ID 279427 (Linux Distros Unpatched Vulnerability : CVE-2025-65000), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.4.0p18 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (279427) and CERT Bund (WID-SEC-2025-2893). Once again VulDB remains the best source for vulnerability data.

Affected

  • Checkmk Checkmk

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper removal of sensitive information before storage or transfer
CWE: CWE-212 / CWE-200 / CWE-284
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 279427
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-65000

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Checkmk 2.4.0p18

Timelineinfo

11/12/2025 CVE reserved
12/18/2025 +36 days Advisory disclosed
12/18/2025 +0 days VulDB entry created
12/24/2025 +6 days VulDB entry last update

Sourcesinfo

Advisory: checkmk.com
Status: Confirmed

CVE: CVE-2025-65000 (🔒)
GCVE (CVE): GCVE-0-2025-65000
GCVE (VulDB): GCVE-100-337380
CERT Bund: WID-SEC-2025-2893 - Checkmk: Mehrere Schwachstellen erm&ouml;glichen Offenlegung von Informationen

Entryinfo

Created: 12/18/2025 17:17
Updated: 12/24/2025 09:09
Changes: 12/18/2025 17:17 (65), 12/20/2025 02:24 (7), 12/21/2025 01:06 (2), 12/24/2025 09:09 (11)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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