BlackICE PC Protection and Server Protection installs (1) firewall.ini, (2) blackice.ini, (3) sigs.ini and (4) protect.ini with Everyone Full Control permissions, which allows local users to cause a denial of service (crash) or modify configuration, as demonstrated by modifying firewall.ini to contain a large firewall rule.

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.