BobB writes to tell us NetworkWorld is reporting that new code released on Sunday could allow a fully patched Windows XP PC's personal firewall to be disabled via a malicious data packet. The exploit depends on the use of Microsoft's Internet Connection Service. From the article: "The attacker could send a malicious data packet to another PC using ICS that would cause the service to terminate. Because this service is connected to the Windows firewall, this packet would also cause the firewall to stop working, said Tyler Reguly, a research engineer at nCircle Network Security Inc."