Security | Threat Detection | Cyberattacks | DevSecOps | Compliance

The 2025 Cloudflare Radar Year in Review is here: our sixth annual review of the Internet trends and patterns we observed throughout the year, based on Cloudflare’s expansive network view.

On December 3, 2025, immediately following the public disclosure of the critical, maximum-severity React2Shell vulnerability (CVE-2025-55182), the Cloudforce One Threat Intelligence team began monitoring for early signs of exploitation. Within hours, we observed scanning and active exploitation attempts, including traffic originating from infrastructure associated with Asian-nexus threat groups.

Cloudflare has deployed a new protection to address a vulnerability in React Server Components (RSC). All Cloudflare customers are automatically protected, including those on free and paid plans, as long as their React application traffic is proxied through the Cloudflare Web Application Firewall (WAF). Cloudflare Workers are inherently immune to this exploit. React-based applications and frameworks deployed on Workers are not affected by this vulnerability.

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.

As the surface area for attacks on the web increases, Cloudflare’s Web Application Firewall (WAF) provides a myriad of solutions to mitigate these attacks. This is great for our customers, but the cardinality in the workloads of the millions of requests we service means that generating false positives is inevitable. This means that the default configuration we have for our customers has to be fine-tuned.

We have some big news to share today: Replicate, the leading platform for running AI models, is joining Cloudflare. We first started talking to Replicate because we shared a lot in common beyond just a passion for bright color palettes. Our mission for Cloudflare’s Workers developer platform has been to make building and deploying full-stack applications as easy as possible. Meanwhile, Replicate has been on a similar mission to make deploying AI models as easy as writing a single line of code.

As bots and agents start cryptographically signing their requests, there is a growing need for website operators to learn public keys as they are setting up their service. I might be able to find the public key material for well-known fetchers and crawlers, but what about the next 1,000 or next 1,000,000? And how do I find their public key material in order to verify that they are who they say they are? This problem is called discovery.