We Now Know What Caused the Cloudflare Outage Tuesday Morning

Tuesday morning was a stark reminder of how fragile the global internet really is. Websites from X to ChatGPT went offline as Cloudflare, the company they rely on for web infrastructure services, experienced a massive outage. A huge number of sites and services across the world contract Cloudflare for cybersecurity protections, as well as to route traffic through servers local to each user, all in the name of performance and reliability. Ironic, of course, given today's events.

When the public experiences such a massive internet outage, speculation runs awry. What caused this? Was it a simple bug on Cloudflare's part, or something malicious? Are bad actors attacking Cloudflare, and the sites that rely on it? But, as it turns out, the reason appears to be closer to the former than the latter.

Cloudflare's outage was a glitch

In a statement to Mashable, Cloudflare confirmed that the company had identified the cause of the issue, and had rolled out a fix to patch it. In addition, Cloudflare is adamant there is no reason to believe a cyberattack caused this outage. This is the full statement:

"Many of Cloudflare's services experienced a significant outage today beginning around 11:20 UTC. It was fully resolved at 14:30 UTC. The root cause of the outage was a configuration file that is automatically generated to manage threat traffic. The file grew beyond an expected size of entries and triggered a crash in the software system that handles traffic for a number of Cloudflare's services.

To be clear, there is no evidence that this was the result of an attack or caused by malicious activity. We expect that some Cloudflare services will be briefly degraded as traffic naturally spikes post incident but we expect all services to return to normal in the next few hours. A detailed explanation will be posted soon on blog.cloudflare.com. Given the importance of Cloudflare's services, any outage is unacceptable. We apologize to our customers and the Internet in general for letting you down today. We will learn from today's incident and improve."

It seems the reason for the outage was a preventative measure meant to block a potential cyberattack. While that goal is obviously important, it shows how complex these systems really are: One glitch with one cybersecurity protocol spun out of control, and took down the network en masse.

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