There was a vuln/exploit announcement on FD today for QBik Wingate, the exploit says it's for "QBik Wingate version 6.1.1.1077 remote exploit for Win2k SP4 (german)".

Information is available here;

ISS rates this High Risk
WinGate HTTP proxy buffer overflow

Secunia - WinGate WWW Proxy Server Buffer Overflow Vulnerability

I do not see patch information available at this time.