Cloudflare Outage Caused by React2Shell Mitigations

SecurityWeek

December 5, 2025 at 3:12 PM

Actively Exploited

Overview

The article discusses a critical vulnerability in React that has been exploited by various threat actors, leading to a significant outage at Cloudflare as they implemented mitigations against the React2Shell exploit. This incident highlights the ongoing risks associated with vulnerabilities in widely used frameworks and the need for timely responses to emerging threats.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: React framework, Cloudflare services
Action Required: Organizations using React should immediately update to the latest version of the framework and implement security best practices to mitigate the risk of exploitation.
Timeline: Newly disclosed

Original Article Summary

The critical React vulnerability has been exploited in the wild by Chinese and other threat actors. The post Cloudflare Outage Caused by React2Shell Mitigations appeared first on SecurityWeek.

Impact

React framework, Cloudflare services

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Organizations using React should immediately update to the latest version of the framework and implement security best practices to mitigate the risk of exploitation. Regularly review and apply security patches as they become available.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

Related Topics: This incident relates to Exploit, Vulnerability, Critical.

Read Original Article

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