Technical Information

Brief overview of the risk:
This security update resolves a privately reported vulnerability in Windows DNS resolution. The vulnerability could allow remote code execution if an attacker gained access to the network and then created a custom program to send specially crafted LLMNR broadcast queries to the target systems.
Detailed Information on the risk:

A remote code execution vulnerability exists in the way that the DNS client service handles specially crafted LLMNR queries. An attacker who successfully exploited this vulnerability could run arbitrary code in the context of the NetworkService account. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

Further information on this exploit is available at : MS11-030