The Remote Data Protocol (RDP) version 5.1 in Microsoft Windows XP allows remote attackers to cause a denial of service (crash) when Remote Desktop is enabled via a PDU Confirm Active data packet that does not set the Pattern BLT command, aka "Denial of Service in Remote Desktop."
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-051
http://www.iss.net/security_center/static/10120.php