Is CVE-2021-20251 in the CISA KEV catalog?

No. CVE-2021-20251 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20251?

CVE-2021-20251 has a CVSS v3 base score of 5.9 (MEDIUM).

What is the EPSS score for CVE-2021-20251?

CVE-2021-20251 has an EPSS score of 0.76% (51th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20251?

Upgrade samba on debian 12 to 2:4.17.2+dfsg-3 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-20251

MEDIUM

5.9

CVSS v3

NVD

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.

CWE-362Race Condition

How to fix

Remediation Available

sambaDebian

Fixed in:2:4.17.2+dfsg-3CVE-2021-20251

sambaUbuntu

Fixed in:2:4.13.17~dfsg-0ubuntu1.20.04.4USN-5822-1

Fixed in:2:4.15.13+dfsg-0ubuntu1USN-5822-1

Fixed in:2:4.16.8+dfsg-0ubuntu1USN-5822-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

0.76%probability of exploitation in 30 days

51stpercentile

Moderate risk: more likely to be exploited than 51% of all known CVEs.

References

Exploit1

bugzilla.samba.org

Third-Party Advisory2

Other references1

security.gentoo.org

Related Vulnerabilities

Other CWE-362 (Race Condition) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-6387	High	8.1	100%	-	Fix
CVE-2023-36884	High	7.5	99%	KEV + Ransom	Fix
CVE-2018-15473	Medium	5.3	99%	-	Fix
CVE-2024-27983	High	8.2	87%	-	Fix
CVE-2014-0226	Medium	6.8	86%	-	Fix
CVE-2016-5195	High	7.0	84%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.