With more and more platforms taking the necessary precautions against DDoS attacks like integrating DDoS mitigation services and increasing bandwidth at weak points, Layer 3 and 4 attacks are just not as effective anymore.
A week ago we published a story about new amplification attacks using memcached protocol on UDP port 11211. A few things happened since then: Github announced it was a target of 1.3Tbps memcached attack. OVH and Arbor reported similar large attacks with the peak reported at 1.7Tbps.
Over last couple of days we've seen a big increase in an obscure amplification attack vector - using the memcached protocol, coming from UDP port 11211. In the past, we have talked a lot about amplification attacks happening on the internet.
To everyone in Cloudflare, account security is one of our most important tasks. We recognize that to every customer on our platform, we are critical infrastructure. We also know that the simplest attacks often lead to the most devastating of outcomes.
In April, we wrote about Web Cache Deception attacks, and how our customers can avoid them using origin configuration. Since our previous blog post, we have looked for but have not seen any large scale attacks like this in the wild.