According to BleepingComputer, content delivery network Cloudflare recently recorded the largest distributed denial-of-service (DDoS) attack ever measured. As of September 2025, Cloudflare is used by approximately 19.8 percent of all websites as a reverse proxy.
At its peak, the enormous DDoS attack measured a whopping 22.2 terabits per second (TB/s) of network activity, blowing out of the water the previous record of 11.5 TB/s from three weeks ago.
The DDoS attack lasted 40 seconds and was equivalent to streaming 1 million 4K videos simultaneously.
It’s yet unclear who was behind the record-breaking DDoS attack, but experts say the previous one was carried out by a botnet called Aisuru.
This article originally appeared on our sister publication PC för Alla and was translated and localized from Swedish.
