500 Tbps of capacity: 16 years of scaling our global network
2026-04-10
Cloudflare’s global network has officially crossed 500 Tbps of external capacity, enough to route more than 20% of the web and absorb the largest DDoS attacks ever recorded....
DDoS
Introducing Programmable Flow Protection: custom DDoS mitigation logic for Magic Transit customers
2026-03-31
Magic Transit customers can now program their own DDoS mitigation logic and deploy it across Cloudflare’s global network. This enables precise, stateful mitigation for custom and proprietary UDP protocols....
2025 Q4 DDoS threat report: A record-setting 31.4 Tbps attack caps a year of massive DDoS assaults
2026-02-05
The number of DDoS attacks more than doubled in 2025. The network layer is under particular threat as hyper-volumetric attacks grew 700%....
Cloudflare's 2025 Q3 DDoS threat report -- including Aisuru, the apex of botnets
2025-12-03
Welcome to the 23rd edition of Cloudflare’s Quarterly DDoS Threat Report. This report offers a comprehensive analysis of the evolving threat landscape of Distributed Denial of Service (DDoS) attacks based on data from the Cloudflare network. In this edition, we focus on the third quarter of 2025....
Go and enhance your calm: demolishing an HTTP/2 interop problem
2025-10-31
HTTP/2 implementations often respond to suspected attacks by closing the connection with an ENHANCE_YOUR_CALM error code. Learn how a common pattern of using Go's HTTP/2 client can lead to unintended errors and the solution to avoiding them....
How a volunteer-run wildfire site in Portugal stayed online during DDoS attacks
2025-08-21
Fogos.pt, a volunteer-run wildfire tracker in Portugal, grew from a side project into a critical national resource used by citizens, media, and government. During 2025 fire season it was hit by DDoS ...
MadeYouReset: An HTTP/2 vulnerability thwarted by Rapid Reset mitigations
2025-08-14
A new HTTP/2 denial-of-service (DoS) vulnerability called MadeYouReset was recently disclosed by security researchers. Cloudflare HTTP DDoS mitigation, already protects from MadeYouReset....
Hyper-volumetric DDoS attacks skyrocket: Cloudflare’s 2025 Q2 DDoS threat report
2025-07-15
June was the busiest month for DDoS attacks in 2025 Q2, accounting for nearly 38% of all observed activity....
Defending the Internet: how Cloudflare blocked a monumental 7.3 Tbps DDoS attack
2025-06-19
In mid-May 2025, Cloudflare blocked the largest DDoS attack ever recorded: a staggering 7.3 terabits per second (Tbps)....
Targeted by 20.5 million DDoS attacks, up 358% year-over-year: Cloudflare’s 2025 Q1 DDoS Threat Report
2025-04-27
DDoS attacks are surging. In 2025 Q1, Cloudflare blocked +20M attacks (a 358% YoY spike) along with 5.6 Tbps and 4.8 Bpps record-breaking attacks....
Extending Cloudflare Radar’s security insights with new DDoS, leaked credentials, and bots datasets
2025-03-18
For Security Week 2025, we are adding several new DDoS-focused graphs, new insights into leaked credential trends, and a new Bots page to Cloudflare Radar. ...
QUIC action: patching a broadcast address amplification vulnerability
2025-02-10
Cloudflare was recently contacted by researchers who discovered a broadcast amplification vulnerability through their QUIC Internet measurement research. We've implemented a mitigation....
Cloudflare thwarts over 47 million cyberthreats against Jewish and Holocaust educational websites
2025-01-27
January 27 marks the International Holocaust Remembrance Day — a solemn occasion to honor the memory of the six million Jews who perished in the Holocaust, along with countless others who fell victim...
Record-breaking 5.6 Tbps DDoS attack and global DDoS trends for 2024 Q4
2025-01-21
2024 ended with a bang. Cloudflare mitigated another record-breaking DDoS attack peaking at 5.6 Tbps....
Global elections in 2024: Internet traffic and cyber threat trends
2024-12-23
In 2024, as elections took place across over 60 countries, the Internet became both a battleground for cyberattacks and a vital platform for democratic engagement....
From deals to DDoS: exploring Cyber Week 2024 Internet trends
2024-12-03
How significant are Cyber Week shopping days on the Internet? Is it a global phenomenon? Does E-commerce interest peak on Black Friday or Cyber Monday, and are attacks increasing during this time? ...
Bigger and badder: how DDoS attack sizes have evolved over the last decade
2024-11-20
If we plot the metrics associated with large DDoS attacks observed in the last 10 years, does it show a straight, steady increase in an exponential curve that keeps becoming steeper, or is it closer to a linear growth? Our analysis found the growth is not linear but rather is exponential, with the slope varying depending on the metric (rps, pps or bps). ...
Exploring Internet traffic shifts and cyber attacks during the 2024 US election
2024-11-06
Election Day 2024 in the US saw a surge in cyber activity. Cloudflare blocked several DDoS attacks on political and election sites, ensuring no impact. In this post, we analyze these attacks, as well...
4.2 Tbps of bad packets and a whole lot more: Cloudflare's Q3 DDoS report
2024-10-23
The number of DDoS attacks spiked in the third quarter of 2024. Cloudflare mitigated nearly 6 million DDoS attacks, representing a 49% increase QoQ and 55% increase YoY....
Training a million models per day to save customers of all sizes from DDoS attacks
2024-10-23
In this post we will describe how we use anomaly detection to watch for novel DDoS attacks. We’ll provide an overview of how we build models which flag unusual traffic and keep our customers safe....
