DNSSEC

Attackers intercept and corrupt DNS responses, inserting malicious data into resolver caches that redirect users to fraudulent sites. This causes data theft, malware infections, and security breaches without user knowledge.

DNSSEC lacks clear error codes to distinguish validation failures from other issues, and clients cannot differentiate between genuine and spoofed SERVFAIL responses, complicating troubleshooting.

The IETF inconsistently prioritizes DNS features: ECS-Client-Subnet was standardized despite concerns, while widely-used features like Response Policy Zones and BIND Views lack RFC documentation, encouraging proprietary solutions and reducing interoperability.

While DNSSEC provides integrity verification, it is tricky to configure and maintain, especially for teams unfamiliar with key rollover and DS record delegation. Additionally, DNSSEC does not encrypt DNS traffic, only verifies it.