Severity Rating: Critical
Revision Note: V1.1 (August 21, 2015): Improved the Update FAQ section and the footnote for the Affected Software table to help customers more easily identify the correct update to apply based on the currently installed version of RDP on Windows 7 systems. These are informational changes only. Customers who have already successfully applied the update do not need to take any action. Customers who have not already installed the necessary update should do so to be protected from the vulnerability it addresses.
Summary: This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if an attacker sends a specially crafted sequence of packets to a targeted system with Remote Desktop Protocol (RDP) enabled. By default, RDP is not enabled on any Windows operating system. Systems that do not have RDP enabled are not at risk.