There is a vulnerability in various Symantec Client Firewall products. This can be exploited to cause a DoS (Denial of Service), which can halt a user's system rendering it inoperable.
The vulnerability is caused by an unspecified error when handling certain TCP traffic.
The vulnerability affects the following products:
* Symantec Norton Internet Security and Professional 2003, 2004
* Symantec Norton Personal Firewall 2003, 2004
* Symantec Client Firewall 5.01, 5.1.1
* Symantec Client Security 1.0 and 1.1
For more information see http://www.sarc.com/avcenter/security/Content/2004.04.20.html