Is CVE-2023-21771 in the CISA KEV catalog?

No. CVE-2023-21771 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-21771?

CVE-2023-21771 has a CVSS v3 base score of 7.0 (HIGH).

What is the EPSS score for CVE-2023-21771?

CVE-2023-21771 has an EPSS score of 0.40% (32th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-21771?

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

CVE & CISA-KEV Catalog

CVE-2023-21771

HIGH

7.0

CVSS v3

NVD

Description

Windows Local Session Manager (LSM) Elevation of Privilege Vulnerability

CWE-591 CWE-362Race Condition

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 VectorLocal

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.40%probability of exploitation in 30 days

32ndpercentile

Low risk: more likely to be exploited than 32% of all known CVEs.

References

Other references1

msrc.microsoft.com

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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.