On Wednesday, researchers uncovered three improperly issued TLS certificates for Cloudflare’s 1.1.1.1 DNS service, encrypted DNS lookup used by millions. The concern was clear: anyone with those credentials could impersonate Cloudflare’s resolver, decrypt user traffic, or redirect queries to malicious sites.

Further investigation revealed the breach was worse than initially thought. Cloudflare confirmed that Fina CA—a Microsoft‑trusted certificate authority, had in fact issued a total of twelve unauthorized certificates for 1.1.1.1 since February 2024. [Read more…]