Description
An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs instead of being released immediately, by sending IXFR queries. This could be used to cause a denial of service if there is a limit to the number of concurrent connections to this backend, or if the process runs out of file descriptors.
Published: 2026-06-25
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6367-1 dnsdist security update
History

Thu, 25 Jun 2026 22:15:00 +0000

Type Values Removed Values Added
First Time appeared Powerdns
Powerdns dnsdist
Vendors & Products Powerdns
Powerdns dnsdist

Thu, 25 Jun 2026 17:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400

Thu, 25 Jun 2026 16:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-400

Thu, 25 Jun 2026 15:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-772
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 25 Jun 2026 13:00:00 +0000

Type Values Removed Values Added
Description An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs instead of being released immediately, by sending IXFR queries. This could be used to cause a denial of service if there is a limit to the number of concurrent connections to this backend, or if the process runs out of file descriptors.
Title Denial of service via IXFR queries
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}


Subscriptions

Powerdns Dnsdist
cve-icon MITRE

Status: PUBLISHED

Assigner: OX

Published:

Updated: 2026-06-25T13:56:22.793Z

Reserved: 2026-04-10T07:11:39.060Z

Link: CVE-2026-40209

cve-icon Vulnrichment

Updated: 2026-06-25T13:56:09.847Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-25T22:00:12Z

Weaknesses