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.