CVE-2023-21768

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

CVE-2023-21768 is fixed in 6 products on 1 platform, first by KB5022303, released January 10, 2023. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

Urgent

CVSS

7.8

Important

Exploitation

More likely

Vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.6542

99th percentile

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows 11 Version 22H2 for ARM64-based Systems	22621.1105	KB5022303	Jan 10, 2023
Windows 11 Version 22H2 for x64-based Systems	22621.1105	KB5022303	Jan 10, 2023
Windows 11 version 21H2 for ARM64-based Systems	22000.1455	KB5022287	Jan 10, 2023
Windows 11 version 21H2 for x64-based Systems	22000.1455	KB5022287	Jan 10, 2023
Windows Server 2022	20348.1487	KB5022291	Jan 10, 2023
Windows Server 2022 (Server Core installation)	20348.1487	KB5022291	Jan 10, 2023

Details

Published
January 10, 2023
Weakness
Untrusted Pointer Dereference
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21768

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