Security News > 2024 > July > Cloudflare blames recent outage on BGP hijacking incident
Internet giant Cloudflare reports that its DNS resolver service, 1.1.1.1, was recently unreachable or degraded for some of its customers because of a combination of Border Gateway Protocol hijacking and a route leak.
The incident occurred last week and affected 300 networks in 70 countries.
The hijack occurred because BGP routing favors the most specific route.
This leak altered the normal BGP routing paths, causing traffic destined for 1.1.1.1 to be misrouted, compounding the hijacking problem and causing additional reachability and latency problems.
Cloudflare identified the problems at around 20:00 UTC and resolved the hijack roughly two hours later.
Cloudflare's first line of response was to engage with the networks involved in the incident while also disabling peering sessions with all problematic networks to mitigate the impact and prevent further propagation of incorrect routes.