The record for the largest DDoS attack ever recorded in June 2025 has already been broken. Cloudflare said it recently blocked the largest DDoS attack in history, which peaked at 11.5 Tbps.
“Cloudflare’s defenses are operating nonstop. Over the past few weeks, we’ve blocked hundreds of hyper-volume DDoS attacks, the largest of which peaked at 5.1 billion packets per second and 11.5 Tbps,” Cloudflare said.
According to the company, the attack was a UDP flood originating from multiple cloud and IoT providers, including Google Cloud. Cloudflare representatives said they plan to publish a detailed report on the incident in the near future. According to an image attached to the company’s press release, the record-breaking attack lasted only about 35 seconds.
Recall that the previous record was set in June of this year. At that time, Cloudflare announced that it had neutralized a DDoS attack targeting an unidentified hosting provider, whose peak power reached 7.3 Tbps.
This attack was 12% higher than the previous record of 5.6 Tbps, set in January 2025.
At the time, experts wrote that a huge amount of data was transferred in just 45 seconds: 37.4 TB. This is equivalent to approximately 7,500 hours of HD streaming or the transfer of 12,500,000 JPEG photos.
In its Q1 2025 report, Cloudflare said it blocked a total of 21.3 million DDoS attacks against its customers last year, as well as more than 6.6 million attacks on the company’s own infrastructure.
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