CVE-2025-30194

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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OXCNA
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVEADP
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CISA-ADPADP
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Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 1%
Debian logo
Debian Releases
Debian Product
Codename
dnsdist
bullseye
1.5.1-3
not-affected
bookworm
1.7.3-2
not-affected
trixie
1.9.10-1
fixed
sid
1.9.10-1
fixed
Common Weakness Enumeration
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