CVE-2002-1103: Cisco VPN 3000 Concentrator Series Software

Medium severity, CVSS 5.0. EPSS: 1.4% chance of exploitation in the next 30 days.

Cisco VPN 3000 Concentrator 2.2.x, 3.6(Rel), and 3.x before 3.5.5, allows remote attackers to cause a denial of service via (1) malformed or (2) large ISAKMP packets.

Affected products

• Cisco VPN 3000 Concentrator Series Software: version 2.0 only; version 2.5.2.a only; version 2.5.2.b only; version 2.5.2.c only; version 2.5.2.d only; version 2.5.2.f only; …
• Cisco VPN 3002 Hardware Client: any version

Published 2002-10-04. Last modified 2026-06-16.