Cloudflare Network Outage Analysis: November 18, 2025 Incident Report
By
eastdakota
Baker's choice. Dense with flavour, light on filler.
Summary
Cloudflare experienced a major network outage on November 18, 2025, starting at 11:20 UTC, affecting core network traffic delivery and causing error pages for users trying to access customer sites. The outage was not caused by a cyber attack but by a bug in the generation logic for a Bot Management feature file, which impacted many Cloudflare services. The article appears to be an incident report or post-mortem analysis detailing the technical cause and impact of the service disruption.
Key quotes
· 4 pulledOn 18 November 2025 at 11:20 UTC (all times in this blog are UTC), Cloudflare's network began experiencing significant failures to deliver core network traffic.
This showed up to Internet users trying to access our customers' sites as an error page indicating a failure within Cloudflare's network.
The issue was not caused, directly or indirectly, by a cyber attack or malicious activity.
The outage was triggered by a bug in generation logic for a Bot Management feature file causing many Cloudflare services to be affected.
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