CVE-2026-70071
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Improper Cryptographic Signature Verification in DNS Server

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

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

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-14
AI Q&A
2026-10-13
EPSS Evaluated
N/A
NVD
CVE-2026-70071
EUVD
EUVD-2026-99864

Affected Vendors & Products

Showing 13 associated CPEs
Vendor Product Version / Range
Microsoft Windows 10 Version 1607 10.0.14393.0
Microsoft Windows 10 Version 1809 10.0.17763.0
Microsoft Windows Server 2012 6.2.9200.0
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0
Microsoft Windows Server 2012 R2 6.3.9600.0
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0
Microsoft Windows Server 2016 10.0.14393.0
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0
Microsoft Windows Server 2019 10.0.17763.0
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0
Microsoft Windows Server 2022 10.0.20348.0
Microsoft Windows Server 2025 10.0.26100.0
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-347 The product does not verify, or incorrectly verifies, the cryptographic signature for data.

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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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