Technology

Mis-issued certificates for 1.1.1.1 DNS service pose a threat to the Internet

Source

Ars Technica

Published

Sep 3, 2025

TL;DR

AI Generated

Security concerns have arisen due to the issuance of three TLS certificates for Cloudflare's 1.1.1.1 DNS service, potentially allowing decryption of domain lookup queries encrypted through DNS over HTTPS. These certificates, issued in May, could impact services like Cloudflare's WARP VPN. The certificates were brought to public attention recently and were issued by Fina RDC 2020, a subordinate of Fina Root CA, trusted by the Microsoft Root Certificate Program. Microsoft Edge, used by around 5% of internet browsers, is affected by this issue.

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The number of mis-issued 1.1.1.1 certificates grows. Here’s the latest.

The discovery of three mis-issued TLS certificates for Cloudflare’s 1.1.1.1 encrypted DNS lookup service has sparked concern among Internet security experts, as it could potentially allow unauthorized decryption of users' DNS queries. Since then, it has been revealed that a total of 12 mis-issued certificates have been identified, with nine additional certificates issued since February 2024. Cloudflare has acknowledged the security lapse by Fina CA, the certificate authority responsible for the mis-issued certificates. The incident highlights the importance of maintaining robust security measures in the issuance of digital certificates.

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