Overload attack reaches 11.5 TBit per second

The last record-breaking overload attack was not so long ago, but Cloudflare is already reporting the next observed peak value. On Monday, a distributed denial of service (DDoS) attack reached a peak load of 11.5 terabits per second. This corresponds to the equivalent of more than 1.4 terabytes per second, or the content of 184 DVDs filled to the brim.

This was announced by Cloudflare on Monday evening at Platform X. "Cloudflare's defense mechanisms have been working overtime. Over the past few weeks, we have autonomously blocked hundreds of high-volume DDoS attacks," the company writes there. "The largest reached peak values of 11.5 Tbps". The attackers sent 5.1 billion packets per second (Bpps). According to the report, the latter was a UDP flood attack that mainly originated in the Google cloud. The maximum load attack lasted around 35 seconds, Cloudflare writes further.

Details still unclear

Further details remain unclear at present, such as who was and is the target of the attacks. However, Cloudflare has announced a complete overview in an "upcoming report". This should also include the specific data volume of the attack and similar details.

Cloudflare recently reported a record number of DDoS attacks in mid-June. There, the IT company spoke of the "'largest ever recorded' denial-of-service attack (DDoS) with 7.3 terabits per second (TBit/s)", which it had blocked in mid-May of this year. A data volume of 37.5 terabytes was generated in 45 seconds.

Prior to this, the largest attack to date occurred in mid-April 2025 with 6.5 TBit/s, as Cloudflare noted in its first quarter threat report. This involved 4.8 billion packets per second being used by the perpetrators.

(dmk)