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Cloudflare Thwarts Record 11.5 Tbps DDoS Burst

Autonomous defenses filtered a short, high-intensity UDP flood traced largely to Google Cloud sources.

Overview

  • The surge lasted about 35 seconds and came during weeks of elevated attack activity that Cloudflare says it blocked automatically.
  • Cloudflare measured a peak of 5.1 billion packets per second in the wave, highlighting the emphasis on extreme packet rates as well as bandwidth.
  • The company reports its globally distributed mitigation handled the events in real time without manual intervention.
  • The new peak tops earlier benchmarks the firm disclosed in June 2025 (7.3 Tbps) and October 2024 (3.8 Tbps and 2 billion pps).
  • Cloudflare has logged major growth in DDoS activity, including 21.3 million mitigations in 2024 and multi‑vector campaigns using Mirai-style and amplification techniques.