Cloudflare blames today's outage on emergency React2Shell patch

BleepingComputer

December 5, 2025 at 1:53 PM

Actively Exploited

Overview

Cloudflare has reported an outage due to the emergency patching of a critical React remote code execution vulnerability that is currently being exploited in attacks. This incident highlights the urgency and severity of addressing such vulnerabilities to maintain security and service continuity.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: React framework versions vulnerable to remote code execution, impacting applications built using React.
Action Required: Apply the emergency patch provided by the React development team to mitigate the vulnerability.
Timeline: Newly disclosed

Original Article Summary

Cloudflare has blamed today's outage on the emergency patching of a critical React remote code execution vulnerability, which is now actively exploited in attacks. [...]

Impact

React framework versions vulnerable to remote code execution, impacting applications built using React.

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

Apply the emergency patch provided by the React development team to mitigate the vulnerability. Ensure all applications using React are updated to the latest secure version as soon as possible.

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 Vulnerability, Patch, Critical.

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