Cloudflare has officially released a detailed post-event report on the global network outage on November 18, 2025. The report states that the outage, which began at 11:20 UTC, was not caused by a cyber attack, but was caused by a chain reaction caused by a change in the permissions of the database system. The specific reason is that the characteristic profile of the Bot management system was abnormally large due to changes in the query behavior of the ClickHouse database, which exceeded the preset memory allocation limit, triggering the system crash.
The report details how the core CDN, Turnstile, Workers KV, and many other services were affected during the outage, as well as the full failure handling timeline from 11:28 to 17:06. The Cloudflare team resolved the issue by stopping misconfiguration propagation and rolling back to the normal version.
Cloudflare CEO Matthew Prince acknowledged in the report that this was the company's worst outage since 2019, and promised to strengthen profile verification, add global function switches, and optimize error handling mechanisms to prevent similar incidents from happening again.
Cloudflare: Last night's outage was not caused by a cyber attack, but a chain reaction caused by a change in database system permissions
2025-11-19 01:46:42
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