CVE-2025-0620

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

Severity Score

6.6

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track*

*SSVC

Descriptions

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 was discovered that Samba incorrectly handled certain group membership changes when using Kerberos authentication. A remote user could possibly use this issue to continue to access resources after being removed by an administrator.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

Multiple

Confidentiality

Complete

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:Track*

Exploitation

None

Automatable

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2025-01-21 CVE Reserved
2025-06-06 CVE Published
2025-08-13 CVE Updated
2025-08-14 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-552: Files or Directories Accessible to External Parties

CAPEC

References (4)

URL	Tag	Source
https://access.redhat.com/security/cve/CVE-2025-0620	Vdb Entry
https://bugzilla.redhat.com/show_bug.cgi?id=2370453	Issue Tracking
https://www.samba.org/samba/security/CVE-2025-0620.html
http://www.openwall.com/lists/oss-security/2025/06/03/8

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Red Hat Search vendor "Red Hat"		Enterprise Linux Search vendor "Red Hat" for product "Enterprise Linux"				*		-		Affected
Redhat Search vendor "Redhat"		Openshift Search vendor "Redhat" for product "Openshift"				*		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				*		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				*		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				*		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				*		-		Affected
Suse Search vendor "Suse"		Sle-ha Search vendor "Suse" for product "Sle-ha"				*		-		Affected
Suse Search vendor "Suse"		Sle-module-basesystem Search vendor "Suse" for product "Sle-module-basesystem"				*		-		Affected
Suse Search vendor "Suse"		Sle Hpc Search vendor "Suse" for product "Sle Hpc"				*		-		Affected
Suse Search vendor "Suse"		Sled Search vendor "Suse" for product "Sled"				*		-		Affected
Suse Search vendor "Suse"		Sles Search vendor "Suse" for product "Sles"				*		-		Affected
Suse Search vendor "Suse"		Sles Sap Search vendor "Suse" for product "Sles Sap"				*		-		Affected