CVE-2026-70167

Analyzed Analyzed - Analysis Complete

Type Confusion in DNS Server Leads to Remote Code Execution

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Access of resource using incompatible type ('type confusion') in DNS Server allows an authorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-16

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-70167

EUVD

EUVD-2026-99604

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-843	The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.
CWE-822	The product obtains a value from an untrusted source, converts this value to a pointer, and dereferences the resulting pointer.

Attack-Flow Graph

Executive Summary

This is a type confusion vulnerability in a DNS Server. It allows an authorized attacker to execute arbitrary code remotely over a network by exploiting a flaw where incompatible data types are mishandled.

Detection Guidance

This vulnerability involves type confusion in DNS Server leading to remote code execution. Detection requires monitoring DNS server logs for unusual activity, such as unexpected crashes or malformed DNS queries. Use tools like Windows Event Viewer to check for DNS server errors or crashes. Ensure DNS server software is updated to the latest patches.

Impact Analysis

An attacker could gain control of the affected system, leading to potential data breaches, system compromise, or further network infiltration. Systems running vulnerable DNS Server versions are at risk.

Compliance Impact

This vulnerability allows remote code execution via a type confusion flaw in the DNS Server. Such unauthorized code execution could lead to data breaches, unauthorized access, or data exfiltration, which are critical violations under GDPR and HIPAA. Compliance may be impacted if systems are not patched, as regulators may view unpatched vulnerabilities as negligence in protecting sensitive data.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the DNS Server vulnerability. Monitor Microsoft's security advisories for patches and install them promptly.

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