Technical Information

Brief overview of the risk:

A memory corruption vulnerability exists when Windows Media Foundation improperly handles objects in memory. An attacker who successfully exploited the vulnerability could install programs; view, change, or delete data; or create new accounts with full user rights.
There are multiple ways an attacker could exploit the vulnerability, such as by convincing a user to open a specially crafted document, or by convincing a user to visit a malicious webpage.
This security update addresses the vulnerability by correcting how Windows Media Foundation handles objects in memory.

Further information on this vulnerability is available at : CVE-2021-34439