Check Point Firewall-1 SMTP Resource Exhaustion Vulnerability
These latest Service Packs address the described denial of service issue. It is important to note that even without the new service packs installed, this attack does not disable firewall operations in general, only operation of the SMTP Security Server, since the Security Server operates with a lower processor priority than the FireWall-1 kernel module.
Check Point Software Firewall-1 4.0
Check Point Software Firewall-1 4.1