eEye Digital Security notified Symantec of a Denial of Service vulnerability they found during product testing against Symantec's client firewall applications. By directing a specifically formatted TCP attack against a target system running a vulnerable Symantec application, an attacker can cause a complete system halt. As a result, the targeted system would require a system reboot to clear the problem.
Affected Components
- Norton Internet Security 2003
- Norton Internet Security 2004
- Norton Internet Security Professional 2003
- Norton Internet Security Professional 2004
- Norton Personal Firewall 2003
- Norton Personal Firewall 2004
- Client Firewall 5.01, 5.1.1
- Client Security 1.0

Run your LiveUpdate guy!

Source: http://securityresponse.symantec.com...004.04.20.html