The implementation of the Remote Data Protocol (RDP) in Windows 2000 Terminal Service does not correctly handle a particular series of data packets. If such a series of packets were received by an affected server, it would cause the server to fail. The server could be put back into normal service by rebooting it, but any work in progress at the time of the attack would be lost.

It would not be necessary for an attacker to be able to start a session with an affected server in order to exploit this vulnerability - he would only need the ability to send the correct series of packets to the RDP port on the server. The specific sequence of data packets involved in this vulnerability cannot be generated as part of a legitimate terminal server session. Windows NT 4.0 terminal servers are not affected by this vulnerability.

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