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flag A Cloudflare outage on Dec. 5, 2025, due to a flawed config change during a React2Shell fix, disrupted 28% of traffic for 25 minutes.

flag A Cloudflare outage on December 5, 2025, affecting about 28% of HTTP traffic for 25 minutes, was caused by a flawed configuration change made while addressing the critical React2Shell vulnerability (CVE-2025-55182). flag The issue stemmed from disabling a WAF testing tool during a fix, triggering a bug in the FL1 proxy’s rules module, not a cyberattack. flag The vulnerability allows remote code execution and has been exploited by threat actors, including China-linked groups. flag Cloudflare restored service quickly and is reviewing its change processes after a similar November outage.

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