ISS BlackIce 3.6, as used in multiple products including BlackICE PC Protection, Server Protection, Agent for Server, and RealSecure Desktop 3.6 and 7.0, does not drop privileges before launching help from the "More Info" button in the "Application Protection" dialog, which allows local users to execute arbitrary programs as SYSTEM.

Multiple stack-based buffer overflows in the ICQ parsing routines of the ISS Protocol Analysis Module (PAM) component, as used in various RealSecure, Proventia, and BlackICE products, allow remote attackers to execute arbitrary code via a SRV_MULTI response containing a SRV_USER_ONLINE response packet and a SRV_META_USER response packet with long (1) nickname, (2) firstname, (3) lastname, or (4) email address fields, as exploited by the Witty worm.