Details of the Cloudflare outage on July 2, 2019

Published » 2019-07-13

From John Graham-Cumming's post on Cloudflare's blog,

On July 2, we deployed a new rule in our WAF Managed Rules that caused CPUs to become exhausted on every CPU core that handles HTTP/HTTPS traffic on the Cloudflare network worldwide.

A very well written summary that actually acts as a pretty good advertisement for Cloudflare.