CVE-2021-20251
MEDIUMCVSS 5.9/10EPSS 0.76%
Last modified
CVE-2021-20251 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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.. EPSS estimates a 0.76% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Samba | Samba | >= 4.1.0, < 4.16.8 |
| Samba | Samba | >= 4.17.0, < 4.17.4 |
| Fedoraproject | Fedora | 37 |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1929800Issue Tracking, Third Party Advisory
- https://bugzilla.samba.org/show_bug.cgi?id=14611Exploit, Issue Tracking, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230331-0005/Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1929800Issue Tracking, Third Party Advisory
- https://bugzilla.samba.org/show_bug.cgi?id=14611Exploit, Issue Tracking, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230331-0005/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-20251?
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.
How severe is CVE-2021-20251?
CVE-2021-20251 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 0.76% probability of exploitation in the next 30 days.
How do I fix CVE-2021-20251?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-20251?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST