Race condition in samba
Priority LOW 28CWE-362Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
A flaw was found in samba. A race condition in the password lockout code may lead to the risk of brute force attacks being successful if special conditions are met.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00758 55th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | samba | Samba 4.1 and newer | — | No fix listed | CNA |
- samba Vendor— Affected Samba 4.1 and newer Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* | 4.1.0 to before 4.16.8; 4.17.0 to before 4.17.4 | Vulnerable | Samba |
| cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* | 37 | Vulnerable | Fedoraproject |
- cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* Versions 4.1.0 to before 4.16.8; 4.17.0 to before 4.17.4 Vulnerable ·Samba
- cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* Versions 37 Vulnerable ·Fedoraproject
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
Not affected: 5 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Storage 3
Timeline
- 2026-10-02 Threatist record created from CVE-2021-20251
- 2026-10-03 Alias added: GHSA-9ppx-3j9g-766w
References
Sources
- CVE-2021-20251 · CVE Program
- CVE-2021-20251 · NVD
- FIRST EPSS
- GHSA-9ppx-3j9g-766w · GitHub Advisory Database · CC BY 4.0
- CVE-2021-20251 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences