The default configuration of BlackICE Agent 3.1.eal and 3.1.ebh has a high tcp.maxconnections setting, which could allow remote attackers to cause a denial of service (memory consumption) via a large number of connections to the BlackICE system that consumes more resources than intended by the user.
http://www.iss.net/security_center/static/9405.php
http://archives.neohapsis.com/archives/vulnwatch/2002-q2/0114.html