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Fencer Vulns
high 7.5

CVE-2025-30194 json

Denial of service via crafted DoH exchange

published 2025-04-29 18 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-14811

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

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.

Patch / fix

  • PowerDNS DNSdist 1.9.9
  • dnsdist Debian 14, Debian 13 1.9.9-1

debian advisories DEBIAN-CVE-2025-30194

  • dnsdist SLE Module for Basesystem 15 SP7 1.9.10-150700.3.3.1

suse advisories SUSE-SU-2025:01743-1

  • dnsdist openSUSE Tumbleweed 1.9.10-2.1

opensuse advisories openSUSE-SU-2025:15157-1

  • dnsdist Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 1.9.9-r0

alpine advisories ALPINE-CVE-2025-30194

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-30194 updated cvss 7.5

dnsdist: Denial of service via crafted DoH exchange

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

2.29% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • PowerDNS DNSdist

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.