How severe is CVE-2022-30257?

CVE-2022-30257 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2022-30257 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-30257?

CVE-2022-30257 affects Technitium Dns Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-30257?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2022-30257 published?

CVE-2022-30257 was published on 2022-11-21 and last updated on 2026-06-17.

CVE-2022-30257

CVE-2022-30257 is a critical-severity vulnerability in Technitium Dns Server with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-706.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-706
Affected product: Technitium Dns Server
Published: 2022-11-21
Last modified: 2026-06-17

Description

An issue was discovered in Technitium DNS Server through 8.0.2 that allows variant V1 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.

Frequently asked questions

What is CVE-2022-30257?: An issue was discovered in Technitium DNS Server through 8.0.2 that allows variant V1 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.
How severe is CVE-2022-30257?: CVE-2022-30257 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2022-30257 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-30257?: CVE-2022-30257 affects Technitium Dns Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-30257?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2022-30257 published?: CVE-2022-30257 was published on 2022-11-21 and last updated on 2026-06-17.

References

https://github.com/TechnitiumSoftware/DnsServer/blob/master/CHANGELOG.md#version-81

Affected products (1)

cpe:2.3:a:technitium:dns_server:*:*:*:*:*:*:*:*

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