In this paper, we present first measurements of Internet background radiation
originating from the emerging transport protocol QUIC. Our analysis is based on
the UCSD network telescope, correlated with active measurements. We find that
research projects dominate the QUIC scanning ecosystem but also discover
traffic from non-benign sources. We argue that although QUIC has been carefully
designed to restrict reflective amplification attacks, the QUIC handshake is
prone to resource exhaustion attacks, similar to TCP SYN floods. We confirm
this conjecture by showing how this attack vector is already exploited in
multi-vector attacks: On average, the Internet is exposed to four QUIC floods
per hour and half of these attacks occur concurrently with other common attack
types such as TCP/ICMP floods.

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