The Util_DecodeHTTPAuth function in BNBT BitTorrent Tracker Beta 7.5 Release 2 and earlier allows remote attackers to cause a denial of service (crash) via a Basic Authorization HTTP request with a "A==" value.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16228
http://securitytracker.com/id?1010254
http://secunia.com/advisories/11684