DNS Amplification via Cyclic Delegation in Technitium DNS Server

Publication date: 2026-04-26

Last updated on: 2026-04-29

Assigner: MITRE

Description

Technitium DNS Server before 15.0 allows DNS traffic amplification via cyclic name server delegation.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-04-26

Last Modified

2026-04-29

Generated

2026-07-06

AI Q&A

2026-04-26

EPSS Evaluated

2026-07-05

NVD

CVE-2026-42255

EUVD

EUVD-2026-25688

Affected Vendors & Products

Vendor	Product	Version / Range
technitium	dnsserver	to 15.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-684	The code does not function according to its published specifications, potentially leading to incorrect usage.

Attack-Flow Graph

Executive Summary

This vulnerability exists in Technitium DNS Server versions before 15.0. It allows an attacker to exploit DNS traffic amplification through cyclic name server delegation.

Impact Analysis

The vulnerability can lead to DNS traffic amplification attacks, which may result in increased network traffic and potential denial of service conditions. The CVSS score indicates it can cause integrity and availability impacts without requiring privileges or user interaction.

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