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 SRVMULTI response containing a SRVUSERONLINE response packet and a SRVMETAUSER response packet with long (1) nickname, (2) firstname, (3) lastname, or (4) email address fields, as exploited by the Witty worm.