Answer in brief
CVE-2025-0620 records a Medium severity (CVSS 4.9) vulnerability in Samba: smbd doesn't pick up group membership changes when re-authenticating an expired smb session. The current sources do not mark it as known exploited. The current feed maps samba (generic), Red Hat/samba (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps samba (generic), Red Hat/samba (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| sambageneric | >=4.21.0 <4.21.6 | 4.21.6 |
| Red Hat/sambageneric | * | Not reported |
Published upstream
Jun 6, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 31, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
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.
Quoted source text, attributed separately from HOL analysis.