Cloudflare outage was not caused by a cyber attack

Cloudflare wrongly suspected that the widespread outage that took numerous websites offline on November 18 was caused by a DDoS attack, the company’s CEO has admitted. In his blog post that breaks down what happened, however, Matthew Prince explained that after realizing their mistake, his team was able to fix the issue. “The issue was not caused, directly or indirectly, by a cyber attack or malicious activity of any kind,” he wrote. It was instead caused by a change to its database systems’ permissions, which led to an issue with a file used by its Bot Management system.

The company’s Bot Management system uses a machine learning model to score bots for every request they make when they crawl Cloudflare’s network. Its clients re...