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CVE-2025-30194

7.5 · HIGH

When DNSdist is configured to provide DoH via the nghttp2 provider, an attacker can cause a denial of service by crafting a DoH exchange that triggers an illegal memory access (double-free) and cra…

Published Apr 29, 2025CWE-416EPSS 2.25%

Overview

CVE-2025-30194 is a high-severity vulnerability. It was published on April 29, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

When DNSdist is configured to provide DoH via the nghttp2 provider, an attacker can cause a denial of service by crafting a DoH exchange that triggers an illegal memory access (double-free) and crash of DNSdist, causing a denial of service.

The remedy is: upgrade to the patched 1.9.9 version.

A workaround is to temporarily switch to the h2o provider until DNSdist has been upgraded to a fixed version.

We would like to thank Charles Howes for bringing this issue to our attention.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refdnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-02.htmlRefwww.openwall.com/lists/oss-security/2025/04/29/1Refwww.vicarius.io/vsociety/posts/cve-2025-30194-detection-dnsdist-vulnerabilityRefwww.vicarius.io/vsociety/posts/cve-2025-30194-mitigate-dnsdist-vulnerability

How CyberStrike helps

Frequently asked questions

What is CVE-2025-30194?

CVE-2025-30194 is a high-severity vulnerability. It was published on April 29, 2025 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-30194?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-30194?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-30194?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-30194 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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