On November 18, 2025, at 11:20 UTC, the internet experienced one of its most significant disruptions in recent history. Cloudflare, the infrastructure backbone serving millions of websites and applications, suffered a catastrophic outage that affected an estimated 2.4 billion monthly active users across major platforms.
For nearly six hours, users worldwide encountered HTTP 500 errors instead of their favorite services, marking Cloudflare’s worst incident since 2019.
The outage wasn’t caused by a cyberattack or malicious activity.