CVE-2000-0807
The OPSEC communications authentication mechanism (fwn1) in Check Point VPN-1/FireWall-1 4.1 and earlier allows remote attackers to spoof connections, aka the "OPSEC Authentication Vulnerability."
Date published : 2001-01-22
http://www.checkpoint.com/techsupport/alerts/list_vun.html#OPSEC_Authentication