Cloudflare announced it successfully stopped the largest distributed denial-of-service (DDoS) attack ever recorded, peaking at 11.5 terabits per second. The attack, a UDP flood, lasted around 35 seconds and primarily originated from Google Cloud infrastructure.
In recent weeks, Cloudflare has automatically blocked hundreds of high-volume DDoS attempts, with the most intense reaching 5.1 billion packets per second (Bpps). UDP flood attacks overwhelm targets by bombarding them with small packets, forcing systems to waste resources trying to respond.
This latest incident surpasses a previous record set in May 2025, when Cloudflare mitigated a 7.3 Tbps attack that lasted 45 seconds and delivered 37.4 terabytes of traffic, roughly equal to streaming over 9,000 HD movies. Like the recent attack, it relied on UDP floods and involved more than 122,000 IP addresses.
In total, Cloudflare blocked 27.8 million DDoS attacks in the first half of 2025, already exceeding the 21.3 million attacks recorded throughout 2024.
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