CVE-2002-1623: Check Point VPN-1 Firewall-1

Medium severity, CVSS 5.0. EPSS: 48.6% chance of exploitation in the next 30 days.

The design of the Internet Key Exchange (IKE) protocol, when using Aggressive Mode for shared secret authentication, does not encrypt initiator or responder identities during negotiation, which may allow remote attackers to determine valid usernames by (1) monitoring responses before the password is supplied or (2) sniffing, as originally reported for FireWall-1 SecuRemote.

Affected products

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

Published 2002-12-31. Last modified 2026-06-16.