Cisco VPN Concentrator PPTP Client Remote Denial Of Service Vulnerability

Cisco VPN Concentrator PPTP Client Remote Denial Of Service Vulnerability

Cisco VPN 3000 series concentrators are a family of products for
facilitating secure communications via VPN (Virtual Private Networks).

Under some circumstances, it may be possible for a remote PPTP client to cause a denial of service. By connecting to a vulnerable device with the "No Encryption" option specified in the client, the VPN Concentrator can be made to become unstable. This could result in a denial of service to legitimate users of the device.