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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
PowerDNS DNSdist
Default version status: unaffected
1.9.0 to < 1.9.9affected
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 ↗