The August update is a very important one. There are 121 vulnerabilities patched. There are patches for the usual suspects: .net, Azure, Edge, Office and Visual Studio in addition to Windows itself.
This update is three times the size of last August's update and addresses an issue raised in January 2020 (DogWalk) but dismissed by Microsoft. The vulnerability impacts only "supported" versions of Windows using acknowledged flaws the Windows Support Diagnostic Tool.
Last month's Follina attack also used the WSDT and had also been dismissed by Microsoft.
These zero-day vulnerabilities give the remote user SYSTEM level privileges (higher than Administrator).