Record 11.5 Tbps UDP Flood DDoS Attack Launched from Google Cloud Platform

Cloudflare’s automated defense systems successfully detected and neutralized a hyper-volumetric Distributed Denial-of-Service (DDoS) attack that surged to an unprecedented 11.5 terabits per second (Tbps).

Originating primarily from compromised resources on Google Cloud Platform, the UDP flood peaked and subsided within 35 seconds, underscoring the critical importance of real-time, automated mitigation in today’s high-velocity threat landscape.

Record-Breaking 11.5 Tbps UDP Flood Thwarted

At approximately 03:42 UTC on September 1, Cloudflare’s network telemetry registered a rapid spike in incoming User Datagram Protocol (UDP) traffic.

The volumetric assault, classified as a UDP flood, leveraged the connectionless nature of UDP to overwhelm target servers with a deluge of packets, consuming bandwidth and exhausting server resources.

Cloudflare’s telemetry graph revealed an abrupt climb to 11.5 Tbps, a new industry benchmark for a single DDoS event, before the company’s edge network applied rate limiting and packet filtration rules to drop malicious traffic.

Despite its immense bandwidth, the entire attack campaign lasted only 35 seconds, demonstrating both the potency of modern DDoS techniques and the speed required to counteract them.

Automated Defense in Action

Cloudflare attributed the rapid neutralization to its autonomous DDoS mitigation engine, which integrates machine learning-driven anomaly detection with policy-based filtering at layer 3 and layer 4 of the OSI model.

Upon detecting traffic surges that deviate from baseline norms, the system automatically deploys mitigation rules—such as ACS (Access Control Service) policies, SYN cookie enforcement, and UDP packet rate limiting—across Cloudflare’s global Anycast network.

These measures isolate malicious flows without manual intervention, ensuring near-instant neutralization of hyper-volumetric attacks.

The same infrastructure recently blocked a sustained assault registering 5.1 billion packets per second (Bpps), illustrating the diversity of volumetric vectors threat actors employ.

Cloud Platform Exploitation and Future Outlook

Significantly, most of the attack traffic emanated from virtual machines and container instances on Google Cloud Platform.

This exploitation highlights a growing trend: adversaries are weaponizing scalable public cloud resources to assemble botnets capable of generating Tbps-scale traffic.

By hijacking unsecured or poorly monitored cloud workloads, attackers can amplify their firepower beyond what traditional bot networks achieve.

Cloudflare plans to publish a detailed technical post-mortem—including packet captures, attack choreography, and mitigation telemetry graphs—to help the cybersecurity community develop more resilient defenses.

As DDoS tactics continue evolving, hyper-volumetric attacks pose an existential risk to online services, content delivery networks, and critical infrastructure.

Cloudflare’s success in defending against the 11.5 Tbps UDP flood emphasizes the essential role of automated, network-wide mitigation and real-time traffic analysis.

Organizations must adopt similarly robust, scalable defenses and maintain vigilant monitoring of cloud-based assets to thwart next-generation DDoS threats.

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