CVE-2026-70071

Analyzed Analyzed - Analysis Complete

Improper Cryptographic Signature Verification in DNS Server

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Improper verification of cryptographic signature in DNS Server allows an authorized attacker to perform tampering locally.

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

2026-10-13

EPSS Evaluated

2026-10-18

NVD

CVE-2026-70071

EUVD

EUVD-2026-99864

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
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-347	The product does not verify, or incorrectly verifies, the cryptographic signature for data.

Attack-Flow Graph

Executive Summary

This vulnerability involves improper verification of cryptographic signatures in a DNS Server. An authorized attacker can exploit this to perform tampering locally, potentially altering DNS responses or redirecting traffic without detection.

Impact Analysis

An attacker could manipulate DNS responses to redirect users to malicious sites, intercept communications, or disrupt network services. This may lead to data theft, phishing attacks, or service outages affecting systems running vulnerable Windows versions.

Compliance Impact

This vulnerability could violate compliance requirements by enabling unauthorized data access or tampering with sensitive information. GDPR and HIPAA mandate data integrity and security; exploitation may result in breaches, leading to legal penalties or loss of certification.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the DNS Server component. Monitor Microsoft's security advisories for patches specific to CVE-2026-70071.

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