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Vulnerabilities

Vulnerability · CVE-2025-39664

Insufficient escaping in the report scheduler within Checkmk <2.4.0p13, <2.3.0p38, <2.2.0p46 and 2.1.0 (EOL) allows authenticated attackers to define the storage location of report

Published Oct 9, 2025 · catalog updated Nov 3, 2025 · Checkmk GmbH Checkmk

Last checked Oct 23, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-39664. EPSS is 0.69%. Act only if a listed version of Checkmk GmbH Checkmk is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.69%
Remediation
Version ranges on file
Affected products
vendor Checkmk GmbH Checkmk 2.4.0 <2.4.0p13

Insufficient escaping in the report scheduler within Checkmk <2.4.0p13, <2.3.0p38, <2.2.0p46 and 2.1.0 (EOL) allows authenticated attackers to define the storage location of report file pairs beyond their intended root directory.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Checkmk GmbH Checkmk 2.4.0 <2.4.0p132.4.0 <2.4.0p13

How to fix CVE-2025-39664

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-39664. EPSS is 0.69%. Act only if a listed version of Checkmk GmbH Checkmk is installed.

Which versions are affected?

Compare what you have installed with Checkmk GmbH Checkmk 2.4.0 <2.4.0p13 2.4.0 <2.4.0p13. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.69%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 9, 2025 · EUVD

    Detected

    Insufficient escaping in the report scheduler within Checkmk <2.4.0p13, <2.3.0p38, <2.2.0p46 and 2.1.0 (EOL) allows authenticated attackers to define the storage location of report file pairs beyond their intended root directory.

  2. Nov 3, 2025 · EUVD

    Updated

    Insufficient escaping in the report scheduler within Checkmk <2.4.0p13, <2.3.0p38, <2.2.0p46 and 2.1.0 (EOL) allows authenticated attackers to define the storage location of report file pairs beyond their intended root directory.

Sources

  • CVE.orgVulnerability recordCVE-2025-39664

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-39664

    30-day exploitation probability 0.69%

    first.org
  • EUVDVulnerability recordEUVD-2025-33348

    Insufficient escaping in the report scheduler within Checkmk <2.4.0p13, <2.3.0p38, <2.2.0p46 and 2.1.0 (EOL) allows authenticated attackers to define the storage location of report file pairs beyond their intended root directory.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 23, 2026
  • FIRST EPSSOct 23, 2026
  • EUVDOct 23, 2026