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.

Classification

CVE ID: CVE-2025-30194

CVSS Base Severity: HIGH

CVSS Base Score: 7.5

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor: PowerDNS

Product: DNSdist

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.01% (probability of being exploited)

EPSS Percentile: 1.65% (scored less or equal to compared to others)

EPSS Date: 2025-05-28 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-30194
https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-02.html

Timeline