When big CDNs blink, the web feels it
Last month, Cloudflare had an issue that briefly knocked parts of the internet offline. Many well-known sites slowed down or showed errors at the same time. Why? A big share of today’s web traffic runs through CDNs like Cloudflare, so when they stumble, the ripple is wide. That’s why CDN health matters for performance, trust, and revenue.
What actually happened
So… what’s a CDN and why should I care?
CDNs (Content Delivery Networks) are the internet’s “fast lanes.” They bring your site’s pages, images, and videos closer to each visitor, so everything loads quickly and stays stable even on busy days. Most modern e-shops, media sites, and apps rely on one or more CDNs behind the scenes.
What CDNs actually do
How to reduce risk
CDN quick facts (2025)
👉 Read more here
Sources:
What actually happened
- It wasn’t a cyberattack.
- A routine change caused a Bot Management “feature file” to grow too large; when it propagated, parts of Cloudflare’s proxy software hit a limit and began returning 5xx errors.
- Start: ~11:20 UTC (errors visible to users) → Fix rolling: ~14:30 UTC → All normal: 17:06 UTC.
- Impacted examples: core CDN & security, Turnstile (captcha), Workers KV, Access (auth), plus higher CDN latency during the window.
So… what’s a CDN and why should I care?
CDNs (Content Delivery Networks) are the internet’s “fast lanes.” They bring your site’s pages, images, and videos closer to each visitor, so everything loads quickly and stays stable even on busy days. Most modern e-shops, media sites, and apps rely on one or more CDNs behind the scenes.
What CDNs actually do
- Speed: serve content from nearby locations so pages feel instant.
- Protection: filter bad traffic and support secure connections.
- Stability: keep sites usable during traffic spikes or partial failures.
How to reduce risk
- Monitor from multiple locations (not just one “global” check). Track key flows: login, search, checkout.
- Design for graceful hiccups: keep essentials visible even if a third-party script pauses.
- Light fallback for static assets: at scale, consider a backup path (e.g., images/CSS) so pages stay usable.
CDN quick facts (2025)
- Around 70% of the top 1,000 websites and 69% of the top 10,000 already rely on at least one CDN.
- CDNs are used on roughly 28% of all websites on the internet.
- By deployments, Cloudflare leads with ~62% of CDN usage, followed by Google Cloud CDN (~14%), Fastly (~12%), Akamai (~3%) and Amazon CloudFront (~3%) – the top 5 cover about 94% of the market.
- Cloudflare’s network is estimated to sit in front of around 20% of the web, which explains why a single misconfiguration on November 18 briefly impacted so many services at once.
- The global CDN market is projected to grow from roughly USD 24–26 billion in 2025 to around USD 100+ billion by 2035, driven by video, e-commerce and edge workloads.
👉 Read more here
Sources:
