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Fencer Vulns
high 7.5

CVE-2025-30193 json

Denial of service via crafted TCP exchange

published 2025-05-20 17 mo ago modified 2026-06-17 4 mo ago also EUVD-2025-15818

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service.

The remedy is: upgrade to the patched 1.9.10 version.

A workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting.

We would like to thank Renaud Allard for bringing this issue to our attention.

Patch / fix

  • PowerDNS DNSdist 1.9.10
  • dnsdist Debian 14, Debian 13 1.9.10-1

debian advisories DEBIAN-CVE-2025-30193

  • dnsdist Ubuntu Pro 22.04 LTS 1.6.1-1ubuntu0.1~esm2
  • dnsdist Ubuntu Pro 24.04 LTS 1.8.3-2ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2025-30193

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 15 SP3-LTSS, Enterprise Storage 7.1 1.8.0-150100.3.8.1
  • dnsdist SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +9 more 1.8.0-150400.9.6.1
  • dnsdist SLE Module for Basesystem 15 SP7 1.9.10-150700.3.3.1

suse advisories SUSE-SU-2025:01792-1SUSE-SU-2025:01745-1SUSE-SU-2025:01743-1

  • dnsdist Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 1.9.10-r0

alpine advisories ALPINE-CVE-2025-30193

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-2025-30193 updated cvss 7.5

dnsdist: Denial of service via crafted TCP 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
17 mo ago

Exploit prediction

0.62% chance of exploitation in the next 30 days, higher than 49% 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.