New topic today.
http://www.securityfocus.com/bid/42148
Avast! Internet Security is prone to a local denial-of-service vulnerability.Local attackers can exploit this issue to cause denial-of-service conditions. Due to the nature of this issue, code execution may be possible; however, this has not been confirmed.
This issue affects Avast! Internet Security 5.0; other versions may also be affected.