The seed generation mechanism in the inter-module S/Key authentication mechanism in Check Point VPN-1/FireWall-1 4.1 and earlier allows remote attackers to bypass authentication via a brute force attack, aka "One-time (s/key) Password Authentication."

Buffer overflow in Getkey in the protocol checker in the inter-module communication mechanism in Check Point VPN-1/FireWall-1 4.1 and earlier allows remote attackers to cause a denial of service.

Check Point VPN-1/FireWall-1 4.1 and earlier allows remote attackers to redirect FTP connections to other servers ("FTP Bounce") via invalid FTP commands that are processed improperly by FireWall-1, aka "FTP Connection Enforcement Bypass."

Checkpoint Firewall-1 with the RSH/REXEC setting enabled allows remote attackers to bypass access restrictions and connect to a RSH/REXEC client via malformed connection requests.

Check Point FireWall-1 4.0 and 4.1 allows remote attackers to cause a denial of service by sending a stream of invalid commands (such as binary zeros) to the SMTP Security Server proxy.

Check Point Firewall-1 allows remote attackers to cause a denial of service by sending a large number of malformed fragmented IP packets.

Firewall-1 3.0 and 4.0 leaks packets with private IP address information, which could allow remote attackers to determine the real IP address of the host that is making the connection.

Check Point Firewall-1 does not properly handle certain restricted keywords (e.g., Mail, auth, time) in user-defined objects, which could produce a rule with a default "ANY" address and result in access to more systems than intended by the administrator.