Medium severity · published Jun 6, 2025
CVE-2025-0620
Samba: smbd doesn't pick up group membership changes when re-authenticating an expired smb session
4.9
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 55% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: vendor
SA
Samba · Samba
4.21.0 before 4.21.6; 4.22.0 before 4.22.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-0620
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-0620
Third Party Advisory
https://access.redhat.com/security/cve/CVE-2025-0620
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2370453
Vendor Advisory
https://www.samba.org/samba/security/CVE-2025-0620.html
Mailing List
http://www.openwall.com/lists/oss-security/2025/06/03/8
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