NEW LOOP DOS ATTACK MAY IMPACT UP TO 300,000 ONLINE SYSTEMS

Summary from the TLDR InfoSec newsletter

A new DoS attack relies on a vulnerability in the UDP protocol that allows for IP spoofing. If an attacker launches an attack against a vulnerable server with the spoofed IP of another vulnerable server, the servers will continuously respond with errors to each other until all resources are exhausted. It is estimated that 300,000 servers are vulnerable to this attack.