Technical Information

Brief overview of the risk:

A remote code execution vulnerability exists in Microsoft Exchange through the deserialization of metadata via PowerShell. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the logged in user.

Detailed Information on the risk:
Exploitation of this vulnerability requires that a user run cmdlets via PowerShell.
The security update addresses the vulnerability by correcting how Exchange serializes its metadata.

Further information on this vulnerability is available at : CVE-2019-1373