What is CVE-2022-30258?

CVE-2022-30258 is a critical-severity vulnerability in Technitium DNS Server, classified under Use of Incorrectly-Resolved Name or Reference. CVSS score: 9.8/10. Published 2022-11-21.

How severe is CVE-2022-30258?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Technitium DNS Server

CVE-2022-30258

An issue was discovered in Technitium DNS Server through 8.0.2 that allows variant V2 of unintended domain name resolution. A revoked domain name can still be resolvable for a long time, including expired domains and taken-down malicious domains. The effects of an exploit would be widespread and highly impactful, because the exploitation conforms to de facto DNS specifications and operational practices, and overcomes current mitigation patches for "Ghost" domain names.

Published 2022-11-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (52.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000

Affected products

Technitium DNS Server

Weakness classification (CWE)

CWE-706 — Use of Incorrectly-Resolved Name or Reference

References

github.com/TechnitiumSoftware/DnsServer/blob/master/CHANGELOG.md (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2022-30258?: CVE-2022-30258 is a critical-severity vulnerability in Technitium DNS Server, classified under Use of Incorrectly-Resolved Name or Reference. CVSS score: 9.8/10. Published 2022-11-21.
How severe is CVE-2022-30258?: Critical severity. CVSS v3 base score is 9.8 out of 10.