What happened
Cloudflare confirmed that today’s global outage was caused by an emergency patch deployed in response to the React2Shell vulnerability. A faulty configuration introduced during the rapid update triggered widespread service disruption.
Who is affected
Businesses that rely on Cloudflare for DNS, CDN, and security services experienced slowdowns and downtime during the incident.
Why CISOs should care
The event shows how fast fixes for critical vulnerabilities can create new risks. It underscores the need for strong change controls even during zero day response and highlights the operational impact of failures in core internet infrastructure.
3 practical actions
- Map critical dependencies that rely on third party edge and DNS providers.
- Test emergency patching workflows in a controlled environment before production
- Track Cloudflare advisories and React2Shell updates to stay ahead of further changes.