About 100,000 memcached servers, mostly owned by businesses and other institutions, currently sit exposed online with no authentication protection, meaning an attacker can access them, and send them a special command packet that the server will respond to with a much larger reply.

Source: A 1.3Tbs DDoS Hit GitHub, the Largest Yet Recorded - WIRED

Amazing they could mitigate it. Just a reminder to secure your own infrastructure so it can’t be used to attack someone else.