A significant Cloudflare outage on November 18, 2025, was caused by an internal configuration error involving a permissions change in their database, leading to widespread service disruptions. The incident initially raised fears of a cyberattack but was ultimately attributed to internal system malfunctioning. #Cloudflare #ClickHouse #AisuruAttack
Keypoints
- The outage was triggered by a permissions change in Cloudflare’s ClickHouse database cluster.
- A faulty feature file caused by duplicated metadata led to a cascade of system failures.
- Major services like CDN, Turnstile, Workers KV, and Cloudflare Access were affected.
- The incident was mistaken for a potential cyberattack before internal causes were confirmed.
- Cloudflare implemented several fixes post-incident to prevent future similar outages.
Read More: https://thecyberexpress.com/cloudflare-outage-november-18-2025-analysis/