Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-02.ht
- http://www.openwall.com/lists/oss-security/2025/04/29/1
- https://www.vicarius.io/vsociety/posts/cve-2025-30194-detection-dnsdist-vulnerab
- https://www.vicarius.io/vsociety/posts/cve-2025-30194-mitigate-dnsdist-vulnerabi
FAQ
What is CVE-2025-30194?
CVE-2025-30194 is a vulnerability with a CVSS score of 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 crash ...
How severe is CVE-2025-30194?
CVE-2025-30194 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-30194?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.