Denial of service via crafted DoH exchange
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 2.2%
exploitation probability
2.2%top 19% of all CVEs
observed exploitation
nono source reports it
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
PowerDNS · DNSdistReferences
https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-02.htmlhttps://www.vicarius.io/vsociety/posts/cve-2025-30194-detection-dnsdist-vulnerabilityhttps://www.vicarius.io/vsociety/posts/cve-2025-30194-mitigate-dnsdist-vulnerabilityhttp://www.openwall.com/lists/oss-security/2025/04/29/1