Cloudflare incident on June 20, 2024

On June 20, 2024, two independent events caused an increase in latency and error rates for Internet properties and Cloudflare services lasting 114 minutes. The first event was due to network monitoring detecting performance degradation, causing backbone congestion between 17:33 and 17:50 UTC. The second event occurred when a new DDoS mitigation mechanism deployed between 14:14 and 17:06 UTC triggered a latent bug in the rate limiting system that allowed a specific form of HTTP request to cause a process handling it to enter an infinite loop between 17:47 and 19:27 UTC. The impact from these events was observed in many Cloudflare data centers around the world. To prevent similar problems from occurring again, Cloudflare has made changes to its systems and processes.