CVE-2025-0620: samba — Fix

Description

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.

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CVSS v3.1 Score

4.9

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

Weakness Type (CWE)

CWE-552 CWE-552

Affected Products

Vendor	Product	Versions
samba	samba	4.21.0 — 4.21.6
samba	samba	4.22.0 — 4.22.2

References

Advisories & Patches

https://www.samba.org/samba/security/CVE-2025-0620.html

Other References

https://access.redhat.com/security/cve/CVE-2025-0620 https://bugzilla.redhat.com/show_bug.cgi?id=2370453 http://www.openwall.com/lists/oss-security/2025/06/03/8

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 4.9 (MEDIUM).

How severe is CVE-2025-0620? +

CVE-2025-0620 has a CVSS v3.1 score of 4.9 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-0620? +

CVE-2025-0620 affects products from samba, specifically: samba. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-0620? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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