CVE-2021-43105

4.3 mediumEPSS 0.5%

Medium (4.3) in technitium dns server. 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.

Severity

CVSS 3.1

4.3 medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-31)
Published: 2022-03-28
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

technitium:dns_server

References

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

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