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Cloudflare Outage Traced to Emergency React2Shell Patch Deployment

On Dec 5, 2025, Cloudflare experienced a network disruption lasting approximately 25 minutes due to an internal change made to its Web Application Firewall (WAF). This adjustment aimed to address a critical vulnerability in React Server Components but…

ABy Anthony ReidDec 06, 20251 min read

On Dec 5, 2025, Cloudflare experienced a network disruption lasting approximately 25 minutes due to an internal change made to its Web Application Firewall (WAF). This adjustment aimed to address a critical vulnerability in React Server Components but inadvertently led to widespread service outages.

The outage began at 8:47 GMT, affecting Cloudflare's Dashboard, APIs, and proxied services. This resulted in 500 Internal Server Errors for numerous websites globally, including notable platforms such as Coinbase and Claude AI by Anthropic.

The disruption was linked to modifications in how the WAF processes incoming requests. These changes were implemented to mitigate CVE-2025-55182, a high-severity remote code execution vulnerability in React's Server Components, known as "React2Shell".

React versions 19.0 through 19.2.0 Frameworks such as Next.js (15.x-16.x), React Router, Waku, and RedwoodSDK

This adjustment aimed to address a critical vulnerability in React Server Components but inadvertently led to widespread service outages.
Anthony Reid · Thehackingpost

The patch deployment caused temporary unavailability of Cloudflare's network. Engineers reverted the changes, restoring services by 9:20 UTC. Cloudflare confirmed that the change was a precautionary measure to mitigate industry-wide vulnerabilities and not the result of an attack.

Cloudflare had previously implemented WAF rules on December 2 to block potential exploits, automatically protecting all customers, including those on free plans. There were no detected exploit attempts via these rules prior to the outage.

Organizations are advised to update to React 19.2.1 and the latest Next.js versions to address the vulnerability. Proof-of-concept exploits circulating globally underscore the urgency of these updates.

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This incident follows a recent Cloudflare outage on November 18 due to Bot Management issues. Cloudflare has assured full recovery and ongoing monitoring. Users of affected software are urged to apply updates promptly to mitigate risks.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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