Integer overflow in OmniWeb allows remote attackers to bypass intended port restrictions on outbound TCP connections via a port number outside the range of the unsigned short data type, as demonstrated by a value of 65561 for TCP port 25.
https://exchange.xforce.ibmcloud.com/vulnerabilities/57236
https://euvd.enisa.europa.eu/vulnerability/EUVD-2010-1134
http://www.securityfocus.com/archive/1/510283/100/0/threaded