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Around noon on November 18, 2025, internet users worldwide began experiencing abnormalities when accessing various websites, including news sites, business websites, online stores, and services that rely on nearly all types of APIs. Many websites displayed error messages of the 500 Internal Server Error type.
Shortly thereafter, Cloudflare, a global network service provider that offers DDoS protection, CDN acceleration, and reverse proxy services for millions of websites, reported on its status page that its network was experiencing infrastructure-level issues and was under investigation to determine the cause.
Initial Event: A Fatal Error Without Warning
At 11:48 UTC or 18:48 Thailand time, Cloudflare announced that it had detected an anomaly affecting multiple user groups, confirming that the company’s Dashboard and API were also impacted. This means that not only were customer websites down, but the tools that administrators use to manage websites on Cloudflare were also unavailable.
The notification at that time stated only that
“Cloudflare is experiencing an internal service degradation. Some services may be intermittently impacted. We are focused on restoring service. We will update as we are able to remediate. More updates to follow shortly.”
The situation has rapidly escalated due to Cloudflare being considered a critical component of the internet infrastructure. This is because a vast number of websites, ranging from large corporations to small startups, rely on Cloudflare as a crucial layer for protecting and managing their global traffic.
Recovery signs are beginning to appear, but normalcy has not yet been restored.
Later, at 12:21 UTC or 19:21 Thailand time, Cloudflare announced that some services had begun to resume operation. However, they confirmed that users might still experience higher-than-normal error rates, as the resolution process was not yet complete. This meant that while many websites could load to some extent, they continued to experience intermittent outages or were significantly slower than usual.
Many website owners have begun reporting that nearly all traffic in Analytics has disappeared, while users may find that certain services, such as login, API transactions, or database connections via Cloudflare’s proxy, are experiencing instability.
The Impact Beyond “Unable to Access the Website”
This incident highlights the critical reality that the modern internet relies heavily on just a few major service providers. The outage of Cloudflare therefore did not affect only its direct customers, but also triggered a chain reaction across multiple levels, such as:
1. Online businesses lose revenue immediately.
Many online stores are unable to process transactions, and order information is not being sent to the back-end system. This is causing direct damage to hourly revenue.
2. API services are experiencing a cascading failure.
Many companies rely on Cloudflare Workers, Gateway, or Load Balancer. When these systems fail, mobile applications, websites, and backend systems become disrupted as a result.
3. General users understand that various services are down, even though it is actually a single issue.
When many websites crash simultaneously, general users may be confused, thinking it’s an issue with their mobile device or internet service provider, when it’s actually a reflection of a single problem: Cloudflare.
4. Confidence in the internet infrastructure has been shaken.
The larger and more centralized a platform becomes, the broader the impact when a problem arises at a single point, making it unavoidable for users at all levels.
Why does the Cloudflare issue affect so many people worldwide?
Cloudflare is not just an ordinary CDN, but serves as the “front door” for a vast number of websites. This means:
- Users see Cloudflare before accessing the actual server.
- If Cloudflare experiences an issue, users will be unable to access the origin at all.
- Even if the actual server is operating at 100%, if the Proxy Layer fails, the website is considered “down entirely.”
This is why a 500 error from Cloudflare is akin to a “blackout across the neighborhood” on the internet.
Summary:
The global Cloudflare outage on November 18, 2025, is one of the most striking examples of how the modern internet infrastructure is “more fragile than we thought.” Although the company was able to begin restoring services within an hour, the impacts were already widespread, affecting revenue, reputation, and trust in nearly all types of online services.
