Cyber Resilience

CVE-2025-65000

Checkmk 2.2.0 … 2.4.0

Published
18 December 2025
Modified
23 December 2025
Patch / advisory
View advisory
CVSS Score v4 2.3
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0019 9th percentile
Risk Priority 26 floored blend · peak EPSS

Summary

CVE-2025-65000 is a low-severity Improper Removal of Sensitive Information Before Storage or Transfer (CWE-212) vulnerability in Checkmk Checkmk. Its CVSS base score is 2.3 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Unsecured Credentials (T1552); ranked at the 9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to MP-6 (Media Sanitization) and SI-19 (De-identification) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

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…

more

the handler was deployed.

CWE(s)
CWE-212

Related Threats

MITRE ATT&CK Enterprise Techniques

T1552 Unsecured Credentials Credential Access
Adversaries may search compromised systems to find and obtain insecurely stored credentials.
attack.mitre.org →
T1552.001 Credentials In Files Credential Access
Adversaries may search local file systems and remote file shares for files containing insecurely stored credentials.
attack.mitre.org →
T1552.002 Credentials in Registry Credential Access
Adversaries may search the Registry on compromised systems for insecurely stored credentials.
attack.mitre.org →
T1552.004 Private Keys Credential Access
Adversaries may search for private key certificate files on compromised systems for insecurely stored credentials.
attack.mitre.org →
T1552.006 Group Policy Preferences Credential Access
Adversaries may attempt to find unsecured credentials in Group Policy Preferences (GPP).
attack.mitre.org →
T1003 OS Credential Dumping Credential Access
Adversaries may attempt to dump credentials to obtain account login and credential material, normally in the form of a hash or a clear text password.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-28827Same product: Checkmk Checkmk
CVE-2024-47094Same product: Checkmk Checkmk
CVE-2023-31207Same product: Checkmk Checkmk
CVE-2025-2092Same product: Checkmk Checkmk
CVE-2024-28830Same product: Checkmk Checkmk
CVE-2025-1075Same product: Checkmk Checkmk
CVE-2024-38862Same product: Checkmk Checkmk
CVE-2025-64998Same product: Checkmk Checkmk
CVE-2024-6747Same product: Checkmk Checkmk
CVE-2024-28826Same product: Checkmk Checkmk

Affected Assets

checkmk
checkmk
2.2.0, 2.3.0, 2.4.0

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 5 hardening rules · 3 OS baselines
Validate
Prove the fix (OWASP ASVS)
  • V14.2.8
  • V14.3.3

Mitigating Controls (NIST 800-53 r5) AI

MP-6 Media Sanitization good match

Requires sanitization of media before disposal, release, or reuse, directly stopping sensitive information from remaining in resources made available to unauthorized parties.

SI-19 De-identification good match

Mandates removal of specified PII elements from datasets before further use or sharing, addressing a subset of the improper-removal cases.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.DS-10 mostly match
prevents

Directly addresses removal of confidential data from process memory and similar in-use contexts before exposure.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.10 Information deletion full match
degrades

Explicit information-deletion control directly addresses improper removal of sensitive data.

A.8.11 Data masking full match
prevents

Data-masking techniques can substitute for removal when full deletion is impractical.

A.8.33 Test information mostly match
prevents

Test-data protection rules require sanitization of production data used in testing.

A.5.12 Classification of information partial match
prevents

Classification identifies sensitive data that must be removed before storage or transfer.

A.5.14 Information transfer partial match
prevents

Information-transfer rules can require sanitization of sensitive content before sharing.

A.5.34 Privacy and protection of PII partial match
prevents

PII-protection requirements include removing identifiers before storage or disclosure.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).

Oracle Linux 8 (3 rules)
  • V-248579 OL 8 must restrict access to the kernel message buffer. prevents CWE-212
  • V-248580 OL 8 must prevent kernel profiling by unprivileged users. prevents CWE-212
  • V-248551 A sticky bit must be set on all OL 8 public directories to prevent unauthorized and unintended information transferred via shared system resources. prevents CWE-212
Oracle Linux 9 (1 rule)
  • V-271745 OL 9 must restrict access to the kernel message buffer. prevents CWE-212
RHEL 8 (1 rule)
  • V-230269 RHEL 8 must restrict access to the kernel message buffer. prevents CWE-212

References