Cloudflare successfully mitigated the largest DDOS attack ever recorded, at 29.7 Tbps (Tera bits per second) and 14.1 Bpps (billion packets per second). The attack was carried out by the Aisuru botnet, a 1–4 million-device network launching hyper-volumetric attacks regularly above 1 Tbps and 1 Bpps.
The attack used a UDP “carpet bombing” technique that pounded on about 15,000 destination ports per second while randomizing packet attributes, to evade static filtering and legacy scrubbing centers.
“Since the beginning of 2025, Cloudflare has already mitigated 2,867 Aisuru attacks. In the third quarter alone, Cloudflare mitigated 1,304 hyper-volumetric attacks launched by Aisuru. That represents an increase of 54% QoQ”, says the December 3, 2025 Cloudflare report.
Read more about it here.