Cloudflare's 2025 Q3 DDoS Threat Report Highlights Aisuru Botnet's Rising Threat

Cloudflare's latest Quarterly DDoS Threat Report reveals a significant increase in Distributed Denial of Service (DDoS) attacks in the third quarter of 2025, with a focus on the Aisuru botnet. Aisuru, a massive botnet with an estimated 1-4 million infected hosts globally, unleashed hyper-volumetric DDoS attacks exceeding 1 terabit per second (Tbps) and 1 billion packets per second (Bpps). These attacks surged 54% quarter-over-quarter (QoQ), averaging 14 hyper-volumetric attacks daily.

Key Insights and Statistics:

• Aisuru's attacks peaked at 29.7 Tbps and 14.1 Bpps, setting new records for DDoS attacks.
• DDoS attack traffic against AI companies surged by 347% month-over-month (MoM) in September 2025.
• Escalating EU-China trade tensions led to a significant increase in DDoS attacks against the Mining, Minerals & Metals industry and the Automotive industry.
• Cloudflare's autonomous defenses blocked a total of 8.3 million DDoS attacks in the third quarter of 2025, averaging 3,780 DDoS attacks per hour.
• Network-layer DDoS attacks accounted for 71% of the DDoS attacks in 2025 Q3, increasing by 87% QoQ and 95% year-over-year (YoY).

Practical Implications for Developers:

• Ensure your infrastructure is protected against Aisuru and other botnets by implementing robust DDoS mitigation strategies.
• Monitor your network traffic and adjust your defenses accordingly to prevent collateral damage.
• Consider using Cloudflare's DDoS protection services to safeguard your applications and infrastructure.
• Stay up-to-date with the latest DDoS threat reports and trends to inform your security strategies.