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CVE-2025-0620

Samba: smbd doesn't pick up group membership changes when re-authenticating an expired smb session

MEDIUM
4.9
CVSS Score
Published: June 6, 2025 at 01:10 PM UTC
Updated: August 31, 2026 at 12:17 PM UTC
2 products affected across 2 vendorsSAMBAEnterprise Linux

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Severity
MEDIUM4.9
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

SAMBA· Samba
95%
4.21.0 ≤ v < 4.21.64.22.0 ≤ v < 4.22.2
Affected range stops below 4.21.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.22.2, so it looks safe — our inference, not a vendor statement
Enterprise Linux· Red Hatrpm
60%
10
Vendor states this is fixed in 6 (unaffected)
Vendor states this is fixed in 7 (unaffected)
Vendor states this is fixed in 8 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

VDB Entryx_refsource_REDHATThird Party Advisory
Source: [email protected]
https://access.redhat.com/security/cve/CVE-2025-0620
Issue Trackingx_refsource_REDHATThird Party Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=2370453
Vendor Advisory
Source: [email protected]
https://www.samba.org/samba/security/CVE-2025-0620.html
Mailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2025/06/03/8

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.9MEDIUMredhat
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-552

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