Microsoft Malware Protection Engine is prone to a remote denial-of-service vulnerability because it fails to properly validate certain data structures when parsing specially crafted files. Attackers can exploit this issue to cause an affected computer to stop responding or to restart. Successful attacks will deny service to legitimate users.
Block external access at the network boundary, unless external parties require service.
Filter access to the affected computer at the network boundary if global access isn't needed. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.
Do not accept communications that originate from unknown or untrusted sources.
To reduce the likelihood of successful exploits, never handle files or visit sites of questionable integrity or follow links provided by unfamiliar or untrusted sources.
The vendor has released an advisory and updates addressing this issue. The affected applications have built-in mechanisms to automatically detect and deploy the updates. Please see the referenced advisory for more information.