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November 19, 2025

Cloudflare broke much of the Internet with a corrupted bot management file Jon Brodkin | usagoldmines.com

When a Cloudflare outage disrupted large numbers of websites and online services yesterday, the company initially thought it was hit by a “hyper-scale” DDoS (Distributed Denial-of-Service) attack.

“I worry this is the big botnet flexing,” Cloudflare co-founder and CEO Matthew Prince wrote in an internal chat room yesterday, while he and others discussed whether Cloudflare was being hit by attacks from the prolific Aisuru botnet. But upon further investigation, Cloudflare staff realized the problem had an internal cause: an important file had unexpectedly doubled in size and propagated across the network.

This caused trouble for software that needs to read the file to maintain the Cloudflare bot management system that uses a machine learning model to protect against security threats. Cloudflare’s core CDN, security services, and several other services were affected.

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This articles is written by : Nermeen Nabil Khear Abdelmalak

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