Qbik WinGate 6.1.4 and earlier allows remote attackers to cause a denial of service (CPU consumption) via a DNS request with a self-referencing compressed name pointer, which triggers an infinite loop.
https://exchange.xforce.ibmcloud.com/vulnerabilities/30491
http://www.vupen.com/english/advisories/2006/4711
http://www.securityfocus.com/bid/21295
http://securitytracker.com/id?1017284
http://secunia.com/advisories/23029
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=444