Technical Information

Brief overview of the risk:
The vulnerabilities could allow remote code execution if an attacker sent a specially crafted SMB response to a client-initiated SMB request. To exploit these vulnerabilities, an attacker must convince the user to initiate an SMB connection to a specially crafted SMB server.
Detailed Information on the risk:

A denial of service vulnerability exists in the way that the Microsoft Server Message Block (SMB) client implementation handles specially crafted SMB responses. An attempt to exploit the vulnerability would not require authentication, allowing an attacker to exploit the vulnerability by sending a specially crafted SMB response to a client-initiated SMB request. An attacker who successfully exploited this vulnerability could cause the computer to stop responding until restarted.

Further information on this exploit is available at : MS10-020