CVE-2005-1802: Nortel Contivity

Medium severity, CVSS 5.0. EPSS: 1.6% chance of exploitation in the next 30 days.

Nortel VPN Router (aka Contivity) allows remote attackers to cause a denial of service (crash) via an IPsec IKE packet with a malformed ISAKMP header.

Affected products

• Nortel Contivity: version 1000_vpn_switch only; version 1500_vpn_switch only; version 1600_secure_ip_services_gateway only; version 2000_vpn_switch only; version 2500_vpn_switch only; version 2600_secure_ip_services_gateway only; …
• Nortel VPN Router 1010: any version
• Nortel VPN Router 1050: any version
• Nortel VPN Router 1100: any version
• Nortel VPN Router 1700: any version
• Nortel VPN Router 1740: any version
• Nortel VPN Router 2700: any version
• Nortel VPN Router 5000: any version
• Nortel VPN Router 600: any version

Published 2005-05-27. Last modified 2026-06-16.