CVE-2021-20251 : A flaw was found in samba. A race condition in the password lockout code may lea

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.

Published 2023-03-06 23:15:10

Updated 2023-09-17 09:15:09

Source Red Hat, Inc.

View at NVD, CVE.org

Products affected by CVE-2021-20251

Samba » Samba
Versions from including (>=) 4.1.0 and before (<) 4.16.8
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
Matching versions
Samba » Samba
Versions from including (>=) 4.17.0 and before (<) 4.17.4
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
Matching versions
Fedoraproject » Fedora » Version: 37
cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
Matching versions

Threat overview for CVE-2021-20251

Top countries where our scanners detected CVE-2021-20251

Top open port discovered on systems with this issue 445

IPs affected by CVE-2021-20251 168,301

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2021-20251!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-20251

EPSS FAQ

0.18%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 36 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-20251

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source	First Seen
5.9	MEDIUM	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N	2.2	3.6	NIST
Attack Vector: Network Attack Complexity: High Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: High Availability: None

CWE ids for CVE-2021-20251

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
Assigned by:
- nvd@nist.gov (Primary)
- secalert@redhat.com (Secondary)

References for CVE-2021-20251

https://bugzilla.samba.org/show_bug.cgi?id=14611

Exploit;Issue Tracking;Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1929800

1929800 – (CVE-2021-20251) CVE-2021-20251 samba: Race condition in the bad password lockout code
Issue Tracking;Third Party Advisory
https://security.netapp.com/advisory/ntap-20230331-0005/

CVE-2021-20251 Samba Vulnerability in NetApp Products | NetApp Product Security
Third Party Advisory
https://security.gentoo.org/glsa/202309-06

Samba: Multiple Vulnerabilities (GLSA 202309-06) — Gentoo security

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