Cloudflare Confirms BGP Hijack Behind 1.1.1.1 DNS Disruption

Cloudflare has revealed that a 62-minute global outage of its popular 1.1.1.1 DNS resolver service on July 14, 2025, was caused by an internal configuration error rather than an external attack, though the incident coincided with an unrelated BGP hijack that complicated the situation.

The outage, which lasted from 21:52 UTC to 22:54 UTC, affected millions of users worldwide who rely on the 1.1.1.1 public DNS resolver service.

During the disruption, most internet services became unavailable for affected users as they were unable to resolve domain names.

The incident represents one of the most significant DNS outages in recent years, given 1.1.1.1’s status as one of the world’s most popular DNS resolver services since its launch in 2018.

Root Cause and Timeline

The outage originated from a configuration error introduced on June 6, 2025, during preparations for ...