CVE-2000-0807: Check Point Firewall-1

High severity, CVSS 7.5. EPSS: 1.7% chance of exploitation in the next 30 days.

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."

Affected products

• Check Point Firewall-1: version 3.0 only; version 4.0 only; version 4.1 only

Published 2000-11-14. Last modified 2026-06-16.