Cloudflare Blocks Largest DDoS Attack in History as Global Cyber Threats Surge

Cloudflare announced on Wednesday that it has detected and stopped the largest distributed denial of service (DDoS) attack ever recorded. 

The attack peaked at 29.7 terabits per second and lasted 69 seconds. The company said the traffic came from a botnet-for-hire called AISURU, which has been behind several extreme DDoS incidents over the past year. Cloudflare did not reveal the name of the targeted organization. 

AISURU has repeatedly targeted telecommunication companies, gaming platforms, hosting providers and financial services. 

Cloudflare said it also blocked another massive attack from the same botnet that reached 14.1 billion packets per second. Security researchers estimate that AISURU is powered by one to four million infected devices across the world. 

According to Cloudflare, the record-breaking event was a UDP carpet bombing attack that hit around 15,000 ports per second. The attackers randomised packet properties to get past defences, but Cloudflare’s automated systems detected and neutralised the traffic.

Cloudflare has recorded 2,867 AISURU attacks since the beginning of 2025. 

Out of these, 1,304 hyper volumetric attacks happened in the

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