What’s Vulnerable › Vulnerabilities

CVE-2021-43105

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-03-28 · updated 2026-06-17

Description

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: through 7.0

References

• https://github.com/TechnitiumSoftware/DnsServer/blob/master/CHANGELOG.md
• https://github.com/TechnitiumSoftware/DnsServer/blob/master/CHANGELOG.md

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