Technical Information

Brief overview of the risk:
This security update resolves a privately reported vulnerability in the Windows NAT Driver in Microsoft Windows. The vulnerability could allow denial of service if an attacker sends a specially crafted ICMP packet to a target server that is running the Windows NAT Driver service.
Detailed Information on the risk:

A denial of service vulnerability exists in the Windows NAT Driver that could cause the target system to stop responding until restarted.

Further information on this exploit is available at : MS13-064