Cloudflare Blocks Record 11.5 Tbps DDoS Attack

Cloudflare mitigated a historic DDoS attack reaching a peak of 11.5 terabits per second (Tbps) and 1.5 billion packets, marking a new record in DDoS mitigation.

Cloudflare Blocks Record 11.5 Tbps DDoS Attack
David Bombal
105.8K views • Sep 4, 2025
Cloudflare Blocks Record 11.5 Tbps DDoS Attack

About this video

Cloudflare mitigated a record-sized DDoS attack that peaked at 11.5 terabits per second (Tbps)—that’s 11.5 trillion bits each second—and 1.5 billion packets per second (pps). It was a UDP flood, lasted about 35 seconds, and the traffic mainly originated from Google Cloud. The video then shows how attacks like this are powered by botnets of hacked NVRs (security camera recorders) and other IoT devices. It cites a case of a 22-year-old charged over a DDoS-for-hire botnet called Rappobot, and a researcher who captured live traffic from an infected NVR and found an apparent zero-day path-traversal vulnerability on port 80 that downloaded account files. Final message: don’t expose IoT devices directly to the internet.

#ddos #cloudflare #record

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Sep 4, 2025

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