2025-12-11
Early activity indicates that threat actors quickly integrated this vulnerability into their scanning and reconnaissance routines and targeted critical infrastructure including nuclear fuel, uranium and rare earth elements. We outline the tactics they appear to be using and how Cloudflare is protecting customers. ...
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2025-11-03
Cloudflare used historical data to investigate reports of potential new firewall tests in Turkmenistan. Shifts in TCP resets/timeouts across ASNs corroborate large-scale network control system changes. ...
2025-10-30
We propose an open registry format for Web Bot Auth to move beyond IP-based identity. This allows any origin to discover and verify cryptographic keys for bots, fostering a decentralized and more trustworthy ecosystem....
2025-10-30
As AI agents change how the Internet is used, they create a challenge for security. We explore how Anonymous Credentials can rate limit agent traffic and block abuse without tracking users or compromising their privacy....
2025-10-29
Researchers and practitioners have been studying connections almost as long as the Internet that supports them. Today, Cloudflare’s global network receives millions of connections per second. We explore various characteristics of TCP connections, including lifetimes, sizes, and more....
October 29, 2025 1:00 PM
IPv4 scarcity drives widespread use of Carrier-Grade Network Address Translation, a practice in ISPs and mobile networks that places many users behind each IP address, along with their collected activity and volumes of traffic. We introduce the method we’ve developed to detect la...
October 29, 2025 1:00 PM
WARP’s initial implementation resembled a VPN that allows Internet access through it. Here’s how we built it – and how you can, too. ...
October 29, 2025 1:00 PM
We identified and patched two DDoS vulnerabilities in our QUIC implementation related to packet acknowledgements. Cloudflare customers were not affected. We examine the "Optimistic ACK" attack vector and our solution, which dynamically skips packet numbers to validate client beha...
October 29, 2025 1:00 PM
Many products at Cloudflare aren’t possible without pushing the limits of network hardware and software to deliver improved performance, increased efficiency, or novel capabilities such as soft-unicast, our method for sharing IP subnets across data centers. Happily, most people d...
October 28, 2025 1:00 PM
Today over half of human-initiated traffic with Cloudflare is protected against harvest-now/decrypt-later with post-quantum encryption. What once was a cool science project, is the new security baseline for the Internet. We’re not done yet: in this blog post we’ll take measure wh...
October 28, 2025 1:00 PM
Cloudflare is launching an experiment with Chrome to evaluate fast, scalable, and quantum-ready Merkle Tree Certificates, all without degrading performance or changing WebPKI trust relationships....
October 28, 2025 1:00 PM
We present a data-driven framework to quantify cross-layer Internet resilience. We also share a list of measurements with which to quantify facets of Internet resilience for geographical areas....
October 27, 2025 1:00 PM
The Internet is one big open system composed of many closed boxes — which makes measuring the Internet difficult. In this post we explore Internet measurement as a science....
October 27, 2025 12:00 PM
Cloudflare Radar has launched a new Top-Level Domain (TLD) page, providing insights into TLD popularity, traffic, and security. The top-ranking TLD may come as a surprise....
October 27, 2025 12:00 PM
While large cloud providers hold vast troves of passive network data, analyzing them is complicated. The scale, noise, and absence of definitive ground truth all create major hurdles. Yet by carefully quantifying these constraints and finding alternative forms of evidence, meanin...
October 27, 2025 12:00 PM
Cloudflare Radar has evolved significantly since its 2020 launch, offering deeper insights into Internet security, routing, and traffic with new tools and data that help anyone understand what's happening online....
October 27, 2025 12:00 PM
Coinciding with the ACM’s Internet Measurement Conference, the Cloudflare Research team is publishing a series of posts this week to share their research on building a more measurable, resilient, and transparent Internet. These posts will cover foundational concepts in Internet m...
October 27, 2025 12:00 PM
In this blog post we’ll discuss how Cloudflare thinks about measuring Internet quality, how our own Cloudflare speed test works, and our future plans for providing Internet measurement tools that help everyone build a better Internet....
October 16, 2025 2:00 PM
There's no way to audit a site’s client-side code as it changes, making it hard to trust sites that use cryptography. We preview a specification we co-authored that adds auditability to the web....
September 24, 2025 2:00 PM
After a year since we started enabling Automatic SSL/TLS, we want to talk about these results, why they matter, and how we’re preparing for the next leap in Internet security....
