How severe is CVE-2025-66003?

CVE-2025-66003 has a CVSS 4.0 base score of 7.3, rated high severity.

Is CVE-2025-66003 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-66003?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-66003 have an EU (EUVD) identifier?

Yes. CVE-2025-66003 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1571.

When was CVE-2025-66003 published?

CVE-2025-66003 was published on 2026-01-08 and last updated on 2026-06-17.

CVE-2025-66003

CVE-2025-66003 is a high-severity vulnerability with a CVSS 4.0 base score of 7.3. 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-73.

Key facts

Severity: High (CVSS 4.0 base score 7.3)
EPSS exploit prediction: 0% (2nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-1571
Weakness: CWE-73
Published: 2026-01-08
Last modified: 2026-06-17

Description

An External Control of File Name or Path vulnerability in smb4k allowsl ocal users to perform a local root exploit via smb4k mounthelper if they can access and control the contents of a Samba shareThis issue affects smb4k: from ? before 4.0.5.

Frequently asked questions

What is CVE-2025-66003?: An External Control of File Name or Path vulnerability in smb4k allowsl ocal users to perform a local root exploit via smb4k mounthelper if they can access and control the contents of a Samba shareThis issue affects smb4k: from ? before 4.0.5.
How severe is CVE-2025-66003?: CVE-2025-66003 has a CVSS 4.0 base score of 7.3, rated high severity.
Is CVE-2025-66003 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-66003?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-66003 have an EU (EUVD) identifier?: Yes. CVE-2025-66003 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1571.
When was CVE-2025-66003 published?: CVE-2025-66003 was published on 2026-01-08 and last updated on 2026-06-17.

References

Other CWE-73 vulnerabilities

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CVE-2025-71334 — Critical (CVSS 9.8): Flowise before 3.0.6 (affected versions 2.2.8 and earlier) contains an arbitrary file access vulnerability due to…
CVE-2025-71333 — Critical (CVSS 9.8): Flowise through 2.2.4 contains an unauthenticated arbitrary file upload vulnerability in the /api/v1/attachments…
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