CVE-2025-0620
Samba: smbd doesn't pick up group membership changes when re-authenticating an expired smb session
At a glance
- Severity
- MEDIUM 4.9
- EPSS
- EPSS 0.75 % · percentile 55 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- redhat
- NVD status
- Modified
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.
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N | redhat |
| CVSS 3.1 | MEDIUM 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N | NVD · secalert@redhat.com (Secondary) |
| CVSS 3.1 | MEDIUM 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N | NVD · nvd@nist.gov (Secondary) |
Weaknesses (CWE)
European references
- ENISA EUVD · EUVD-2025-17307
- GCVE · GCVE-0-2025-0620
Affected configurations (NVD CPE)
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*≥ 4.21.0 < 4.21.6cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*≥ 4.22.0 < 4.22.2
Affected products
References
- https://access.redhat.com/security/cve/CVE-2025-0620
- https://bugzilla.redhat.com/show_bug.cgi?id=2370453
- https://www.samba.org/samba/security/CVE-2025-0620.html
- http://www.openwall.com/lists/oss-security/2025/06/03/8
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |