CVE-2026-83677

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Memory Leak in Windows DHCP Client Allows DoS

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Microsoft Corporation

Description

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

CVSS Scores

EPSS Scores

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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-2026-83677

EUVD

EUVD-2026-99945

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Windows	11 Version 24H2 10.0.26100.0
Microsoft	Windows	11 Version 25H2 10.0.26200.0
Microsoft	Windows	11 version 26H1 10.0.28000.0
Microsoft	Windows	11 Version 26H2 10.0.26300.0
Microsoft	Windows	Server 2025 10.0.26100.0
Microsoft	Windows	Server 2025 (Server Core installation) 10.0.26100.0

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 the Windows DHCP Client. An unauthorized attacker can exploit this to deny service over a network by causing a system to run out of available memory.

Impact Analysis

The impact is a denial of service, meaning affected systems may become unresponsive or crash due to memory exhaustion. This can disrupt network services relying on the DHCP Client.

Compliance Impact

This vulnerability enables denial-of-service attacks by allowing unauthorized network access to exhaust system resources. While not directly violating GDPR or HIPAA, such disruptions could impair data availability, potentially conflicting with requirements for timely access to personal or health data under these regulations.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows DHCP Client vulnerability. Monitor network traffic for unusual activity that may indicate a denial of service attempt.

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