Record-Breaking 11.5 Tbps DDoS Attack Successfully Mitigated

Over the Labor Day weekend, Cloudflare successfully mitigated a record-breaking 11.5 Tbps distributed denial-of-service (DDoS) attack lasting approximately 35 seconds and peaking at over 5.1 billion packets per second. The attack leveraged a simple UDP flood, originating from various IoT devices and cloud providers, including compromised Google Cloud accounts. While simple in nature, the scale and frequency of such attacks are rapidly increasing, with Cloudflare blocking over 6,500 similar attacks in Q2 2025. This highlights the importance of modern internet security defenses and serves as a warning for businesses to implement robust DDoS protection.
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