Cisco VPN 3000 series concentrators and Cisco VPN 3002 Hardware Client 2.x.x through 3.6.7A allow remote attackers to cause a denial of service (slowdown and possibly reload) via a flood of malformed ICMP packets.
References to Advisories, Solutions, and Tools
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US-CERT Vulnerability Note:
20030507 Cisco VPN 3000 Concentrator Vulnerabilities
Advisory; Patch Information