source: http://www.securityfocus.com/bid/9912/info

Symantec Client Firewall has been reported to be prone to a remote denial of service vulnerability. The issue is reported to present itself in the TCP packet processing routines of the affected software.

It is reported that this vulnerability will have a system wide impact, causing Windows GUI and peripherals that are attached to the host to become unresponsive. A hard reset is reported to be required to restore normal functionality to the system.

https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/bin-sploits/23846.tar.gz