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CVE-2021-38638: Security Update Guide - Microsoft Security Response Center
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability This CVE ID is unique from CVE-2021-38628.
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Microsoft Exchange Server Security Feature Bypass Vulnerability
An elevation of privilege vulnerability exists when the Windows Language Pack Installer improperly handles file operations, aka 'Windows Language Pack Installer Elevation of Privilege Vulnerability'.