Symantec Raptor Firewall 6.5 and 6.5.3, Enterprise Firewall 6.5.2 and 7.0, VelociRaptor Models 500/700/1000 and 1100/1200/1300, and Gateway Security 5110/5200/5300 generate easily predictable initial sequence numbers (ISN), which allows remote attackers to spoof connections.

Secure Webserver 1.1 in Raptor 6.5 and Symantec Enterprise Firewall 6.5.2 allows remote attackers to identify IP addresses of hosts on the internal network via a CONNECT request, which generates different error messages if the host is present.

The Notify daemon for Symantec Enterprise Firewall (SEF) 6.5.x drops large alerts when SNMP is used as the transport, which could prevent some alerts from being sent in the event of an attack.

SMTP proxy in Symantec Enterprise Firewall (SEF) 6.5.x includes the firewall's physical interface name and address in an SMTP protocol exchange when NAT translation is made to an address other than the firewall, which could allow remote attackers to determine certain firewall configuration information.