CVE-2021-43105: Technitium DNS Server

Medium severity, CVSS 4.3. EPSS: 0.5% chance of exploitation in the next 30 days.

A vulnerability in the bailiwick checking function in Technitium DNS Server <= v7.0 exists that allows specific malicious users to inject `NS` records of any domain (even TLDs) into the cache and conduct a DNS cache poisoning attack.

Affected products

• Technitium DNS Server: up to and including 7.0

Published 2022-03-28. Last modified 2026-06-17.