Memory Leak in Windows DHCP Server

Publication date: 2026-09-08

Last updated on: 2026-09-24

Assigner: Microsoft Corporation

Description

Missing release of memory after effective lifetime in Windows DHCP Server allows an unauthorized attacker to deny service over a network.

CVSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-24

Generated

2026-09-29

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-70065

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_server_2025	to 10.0.26100.33438 (exc)
microsoft	windows_10_1607	to 10.0.14393.9512 (exc)
microsoft	windows_10_1607	to 10.0.14393.9512 (exc)
microsoft	windows_10_1809	to 10.0.17763.9245 (exc)
microsoft	windows_10_1809	to 10.0.17763.9245 (exc)
microsoft	windows_server_2016	to 10.0.14393.9512 (exc)
microsoft	windows_server_2019	to 10.0.17763.9245 (exc)
microsoft	windows_server_2022	to 10.0.20348.5622 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-401	The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

Attack-Flow Graph

Executive Summary

This vulnerability involves a missing release of memory after its effective lifetime in Windows DHCP Server. An unauthorized attacker can exploit this to deny service over a network by causing the DHCP server to run out of memory.

Impact Analysis

The impact includes network service disruption due to DHCP server failure. Users may experience connectivity issues as the DHCP server becomes unavailable to assign IP addresses.

Mitigation Strategies

Apply the latest security updates from Microsoft for the DHCP Server to address the memory release issue. Monitor network traffic for unusual DHCP server activity that may indicate exploitation attempts.

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