What is CVE-2025-0620?

CVE-2025-0620 is a medium-severity vulnerability in Samba, classified under Files or Directories Accessible to External Parties. CVSS score: 4.9/10. Published 2025-06-06.

How severe is CVE-2025-0620?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Vulnerability in Samba

CVE-2025-0620

A flaw was found in Samba. The smbd service daemon does not pick up group membership changes when re-authenticating an expired SMB session. This issue can expose file shares until clients disconnect and then connect again.

Published 2025-06-06 · last modified 2026-08-31.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.007 (53.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-552 — Files or Directories Accessible to External Parties

References

access.redhat.com/security/cve/CVE-2025-0620 (Third Party Advisory, vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking, Third Party Advisory, Issue Tracking)
www.samba.org/samba/security/CVE-2025-0620.html (Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2025-0620?: CVE-2025-0620 is a medium-severity vulnerability in Samba, classified under Files or Directories Accessible to External Parties. CVSS score: 4.9/10. Published 2025-06-06.
How severe is CVE-2025-0620?: Medium severity. CVSS v3 base score is 4.9 out of 10.