Improper input validation in samba
Priority MEDIUM 42CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
Kerberos acceptors need easy access to stable AD identifiers (eg objectSid). Samba as an AD DC now provides a way for Linux applications to obtain a reliable SID (and samAccountName) in issued tickets.
Why it matters now
EPSS 0.02201 82nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | samba | Affected - All versions since Samba 4.0.0, Fixed-In - v4.15.2, v4.14.10 and v4.13.14 | — | No fix listed | CNA |
- samba Vendor— Affected Affected - All versions since Samba 4.0.0, Fixed-In - v4.15.2, v4.14.10 and v4.13.14 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* | 4.13.0 to before 4.13.14; 4.14.0 to before 4.14.10; 4.15.0 to before 4.15.2 | Vulnerable | Samba |
- cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* Versions 4.13.0 to before 4.13.14; 4.14.0 to before 4.14.10; 4.15.0 to before 4.15.2 Vulnerable ·Samba
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Moderate. 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-2020-25721
- 2026-10-03 Alias added: GHSA-wcq8-frw5-cgvr
References
More Samba vulnerabilities
- TI-2020-01431 Netlogon Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 10.0
- TI-2017-05139 Code injection in samba KEVCVSS 3.1CRITICAL 9.8
- TI-2015-00210 The Netlogon server implementation in smbd in Samba 3.5.x and 3.6.x before 3.6.25, 4.0.x… CVSS 2.0HIGH 10.0
- TI-2003-00081 Buffer overflow in the SMB/CIFS packet fragment re-assembly code for SMB daemon (smbd) in… CVSS 2.0HIGH 10.0
- TI-2003-00185 Buffer overflow in the call_trans2open function in trans2.c for Samba 2.2.x before… CVSS 2.0HIGH 10.0
- TI-2007-02362 Multiple heap-based buffer overflows in the NDR parsing in smbd in Samba 3.0.0 through… CVSS 2.0HIGH 10.0
Sources
- CVE-2020-25721 · CVE Program
- CVE-2020-25721 · NVD
- FIRST EPSS
- GHSA-wcq8-frw5-cgvr · GitHub Advisory Database · CC BY 4.0
- CVE-2020-25721 · 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