Cloudflare Confirms Recent 1.1.1.1 DNS Outage Caused by BGP Attack or Hijack

Cloudflare’s widely used 1.1.1.1 DNS resolver service experienced a significant 62-minute global outage on July 14, 2025, affecting millions of users worldwide from 21:52 UTC to 22:54 UTC. Contrary to initial speculation, the company has confirmed that the outage was caused by an internal configuration error rather than a BGP attack, though a coincidentalBGP hijackby Tata Communications India (AS4755) was observed during the incident. Cloudflare Recent 1.1.1.1 Outage The root cause of the outage was traced back to a configuration change made on June 6, 2025, during preparations for a Data Localization Suite (DLS) service. During this release, prefixes associated with the 1.1.1.1 Resolver service were inadvertently included alongside prefixes intended for the new DLS service. This misconfiguration remained dormant in the production network until July 14, when a second configuration change was made to attach a test location to the non-production service, triggering a global refresh of ne...