Buffer overflow in ISS BlackICE Defender 2.9 and earlier, BlackICE Agent 3.0 and 3.1, and RealSecure Server Sensor 6.0.1 and 6.5 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a flood of large ICMP ping packets.
http://www.securityfocus.com/bid/4025
http://www.iss.net/security_center/static/8058.php
http://www.iss.net/security_center/alerts/advise109.php
http://marc.info/?l=ntbugtraq&m=101353165915171&w=2
http://marc.info/?l=bugtraq&m=101321744807452&w=2