Earlier in the present day, Cloudflare skilled a widespread outage that triggered web sites and on-line platforms worldwide to go down, returning a “500 Inside Server Error” message.
In a standing web page replace, the web infrastructure firm has now blamed the incident on an emergency patch designed to handle a vital distant code execution vulnerability in React Server Parts, which is now actively exploited in assaults.
“A change made to how Cloudflare’s Internet Utility Firewall parses requests triggered Cloudflare’s community to be unavailable for a number of minutes this morning,” Cloudflare stated.
“This was not an assault; the change was deployed by our crew to assist mitigate the industry-wide vulnerability disclosed this week in React Server Parts. We are going to share extra info as we now have it in the present day.”
Tracked as CVE-2025-55182, this most severity safety flaw (dubbed React2Shell) impacts the React open-source JavaScript library for internet and native person interfaces, in addition to dependent React frameworks comparable to Subsequent.js, React Router, Waku, @parcel/rsc, @vitejs/plugin-rsc, and RedwoodSDK.
The vulnerability was discovered within the React Server Parts (RSC) ‘Flight’ protocol, and it permits unauthenticated attackers to realize distant code execution in React and Subsequent.js purposes by sending maliciously crafted HTTP requests to React Server Perform endpoints.
Whereas a number of React packages of their default configuration (i.e., react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack) are weak, the flaw solely impacts React variations 19.0, 19.1.0, 19.1.1, and 19.2.0 launched through the previous yr.
Ongoing React2Shell exploitation
Though the impression just isn’t as widespread as initially believed, safety researchers with Amazon Internet Providers (AWS) have reported that a number of China-linked hacking teams (together with Earth Lamia and Jackpot Panda) have begun exploiting the React2Shell vulnerability hours after the max-severity flaw was disclosed.
The NHS England Nationwide CSOC additionally stated on Thursday that a number of purposeful CVE-2025-55182 proof-of-concept exploits are already obtainable and warned that “continued profitable exploitation within the wild is very probably.”
Final month, Cloudflare skilled one other worldwide outage that introduced down the corporate’s International Community for nearly 6 hours, an incident described by CEO Matthew Prince because the “worst outage since 2019.”
Cloudflare fastened one other large outage in June, which triggered Entry authentication failures and Zero Belief WARP connectivity points throughout a number of areas, and likewise impacted Google Cloud’s infrastructure.
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