CVE-2026-70066
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Use After Free in Windows DHCP Server Allows Local Privilege Escalation

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description
Use after free in Windows DHCP Server allows an authorized attacker to elevate privileges locally.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-19
AI Q&A
2026-10-14
EPSS Evaluated
2026-10-18
NVD
CVE-2026-70066
EUVD
EUVD-2026-99861

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-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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Executive Summary

This vulnerability is a use-after-free issue in the Windows DHCP Server. It allows an authorized attacker to elevate their privileges locally by exploiting memory corruption after it has been freed.

Impact Analysis

An attacker with local access could exploit this to gain higher privileges on the system, potentially allowing them to install programs, view or delete data, or create new accounts with full user rights.

Compliance Impact

This vulnerability allows local privilege escalation in Windows DHCP Server, which could enable unauthorized access to sensitive systems. This may impact compliance by increasing risks to data confidentiality and integrity, potentially violating requirements in GDPR (data protection) and HIPAA (health information security).

Mitigation Strategies

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

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