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.

BlackICE Agent 3.1.eal does not always reactivate after a system standby, which could allow remote attackers and local users to bypass intended firewall restrictions.

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.

BlackIce Defender 2.1 and earlier, and BlackIce Pro 2.0.23 and earlier, do not properly block Back Orifice traffic when the security setting is Nervous or lower.