SAP GUI (Sapgui) 4.6D allows remote attackers to cause a denial of service (crash) via a connection to a high-numbered port, which generates an "unknown connection data" error.
https://exchange.xforce.ibmcloud.com/vulnerabilities/8007
http://www.securityfocus.com/bid/3972
http://archives.neohapsis.com/archives/bugtraq/2002-01/0334.html