Is CVE-2023-21539 in the CISA KEV catalog?

No. CVE-2023-21539 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-21539?

CVE-2023-21539 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2023-21539?

CVE-2023-21539 has an EPSS score of 1.16% (63th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-21539?

Install KB5022282 for Windows 10 Version 20H2. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2023-21539

HIGH

7.5

CVSS v3

NVD

Description

Windows Authentication Remote Code Execution Vulnerability

CWE-125Out-of-bounds Read

How to fix

Remediation Available

Windows 10 Version 20H2Windows

Install:KB5022282Microsoft

Windows 10 Version 21H2Windows

Install:KB5022282Microsoft

Windows 10 Version 22H2Windows

Install:KB5022282Microsoft

Windows 11 Version 22H2Windows

Install:KB5022303Microsoft

Windows 11 version 21H2Windows

Install:KB5022287Microsoft

Windows Server 2022Windows

Install:KB5022291Microsoft

Windows Server 2022 (Server Core installation)Windows

Install:KB5022291Microsoft

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.16%probability of exploitation in 30 days

63rdpercentile

Moderate risk: more likely to be exploited than 63% of all known CVEs.

References

Other references1

msrc.microsoft.com

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	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.