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How Cloudflare blocked the PHP flaws before they were made public

Checking incoming requests alone could not reliably tell a PHP attack apart from normal traffic.

A firewall feature that checks each request together with the server's reply, and blocks the reply if it shows the attack worked. It is turned on for all plans, including free ones.

9 hourshow long protections were live before the flaws were made public
21 Oct 2026Read the post