How severe is CVE-2025-39664?

CVE-2025-39664 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-39664 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-39664?

CVE-2025-39664 primarily affects Checkmk. In total, 94 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-39664?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-39664 have an EU (EUVD) identifier?

Yes. CVE-2025-39664 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-33348.

When was CVE-2025-39664 published?

CVE-2025-39664 was published on 2025-10-09 and last updated on 2026-06-17.

CVE-2025-39664

CVE-2025-39664 is a medium-severity vulnerability in Checkmk with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 7.1
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-33348
Weakness: CWE-22
Affected product: Checkmk
Published: 2025-10-09
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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 file pairs beyond their intended root directory.
How severe is CVE-2025-39664?: CVE-2025-39664 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-39664 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-39664?: CVE-2025-39664 primarily affects Checkmk. In total, 94 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-39664?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-39664 have an EU (EUVD) identifier?: Yes. CVE-2025-39664 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-33348.
When was CVE-2025-39664 published?: CVE-2025-39664 was published on 2025-10-09 and last updated on 2026-06-17.

References

Affected products (94)

cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p1:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p10:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p11:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p12:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p13:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p14:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p16:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p17:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p18:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p19:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p21:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p22:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p23:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p24:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p25:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p26:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p27:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p28:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p29:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p3:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p30:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p31:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p32:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p33:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p34:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p35:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p36:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p37:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p38:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p39:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p4:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p40:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p41:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p42:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p43:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p44:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p45:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p5:*:*:*:*:*:*
cpe:2.3:a:checkmk:checkmk:2.2.0:p6:*:*:*:*:*:*

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