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On July 1st, 2015, the security team at BitTorrent received a report [1] from Florian Adamsky about Distributed Reflective Denial of Service (DRDoS) vulnerabilities affecting several BitTorrent products making use of UDP-based [2] protocols. uTorrent, BitTorrent and BitTorrent Sync use the Micro Transport Protocol (µTP) [3] implementation in libuTP [4] as the preferred transport backend running on top of UDP. 

http://engineering.bittorrent.com/2015/08/27/drdos-udp-based-protocols-and-bittorrent/