Cloudflare Blocks Aisuru Botnet Powered Largest Ever 29.7 Tbps DDoS Attack

Cloudflare’s Q3 2025 DDoS Threat Report reveals the Aisuru botnet launched a record 29.7 Tbps attack. Learn which sectors were the most targeted, and the key drivers behind the surge in attacks.

The Internet faced an aggressive surge in cyberattacks during the third quarter of 2025, according to a comprehensive DDoS threat report from Cloudflare, a web security and infrastructure company. The period was dominated by a notorious IoT botnet called Aisuru, which launched some of the largest-ever attacks.

Aisuru is believed to be a huge army of 1 to 4 million compromised devices worldwide, powerful enough to be rented out to anyone looking to cause chaos for a few hundred to a few thousand US dollars.

The Unprecedented Scale of Aisuru

Cloudflare reports that Aisuru was responsible for a world record-breaking DDoS attack that peaked at 29.7 terabits per second (Tbps) and 14.1 billion packets ...