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Fencer Vulns
low 3.7

CVE-2025-30187 json

Denial of service via crafted DoH exchange in PowerDNS DNSdist

published 2025-09-18 13 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-30004

cvss
3.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits
0
none known

Summary

In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.

Patch / fix

  • PowerDNS DNSdist 1.9.11, 2.0.1
  • dnsdist Debian 13 1.9.10-1+deb13u1
  • dnsdist Debian 14 2.0.1-1

debian advisories DEBIAN-CVE-2025-30187

  • dnsdist Ubuntu 25.10 1.9.10-1ubuntu0.1

ubuntu advisories UBUNTU-CVE-2025-30187

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • dnsdist SLES for SAP applications 16.0, SLES 16.0 1.9.11-160000.1.1
  • dnsdist SLE Module for Basesystem 15 SP7 1.9.11-150700.3.6.1

suse advisories SUSE-SU-2026:20995-1SUSE-SU-2026:0888-1

  • dnsdist openSUSE Leap 16.0 1.9.11-160000.1.1

opensuse advisories openSUSE-SU-2026:20461-1

  • dnsdist Alpine 3.24, Alpine 3.23 2.0.1-r0

alpine advisories ALPINE-CVE-2025-30187

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-2025-30187 updated cvss 3.7

DNSdist: Denial of service via crafted DoH exchange in PowerDNS DNSdist

  • 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
no
Technical impact
partial
Assessed
13 mo ago

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

  • PowerDNS DNSdist

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

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.