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.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| PowerDNS | DNSdist | >= 1.9.0, < 1.9.9 |
References
- https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-02.html
- http://www.openwall.com/lists/oss-security/2025/04/29/1
- https://www.vicarius.io/vsociety/posts/cve-2025-30194-detection-dnsdist-vulnerability
- https://www.vicarius.io/vsociety/posts/cve-2025-30194-mitigate-dnsdist-vulnerability
Timeline
- Published
- Apr 29, 2025
- Last modified
- Jun 17, 2026
- NVD status
- Deferred