CVE-2026-83677

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

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83677	Patch Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_24h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_25h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_26h1:::::::x64:*
	cpe:2.3:o:microsoft:windows_11_26h2:::::::arm64:*
	cpe:2.3:o:microsoft:windows_11_26h2:::::::x64:*
	cpe:2.3:o:microsoft:windows_server_2025:::::::x64:*

History

29 Oct 2026, 18:24

Type	Values Removed	Values Added
First Time		Microsoft windows 11 25h2 Microsoft Microsoft windows 11 26h2 Microsoft windows Server 2025 Microsoft windows 11 24h2 Microsoft windows 11 26h1
References	~~() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83677 -~~	() https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83677 - Patch, Vendor Advisory
CPE		cpe:2.3:o:microsoft:windows_11_26h2:::::::x64:* cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_26h1:::::::x64:* cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_24h2:::::::x64:* cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:* cpe:2.3:o:microsoft:windows_server_2025:::::::x64:* cpe:2.3:o:microsoft:windows_11_26h2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_25h2:::::::x64:*

13 Oct 2026, 19:20

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-13 19:20

Updated : 2026-10-29 18:24

NVD link : CVE-2026-83677

Mitre link : CVE-2026-83677

CVE.ORG link : CVE-2026-83677

JSON object : View

Products Affected

microsoft

windows_11_26h2
windows_11_25h2
windows_11_24h2
windows_11_26h1
windows_server_2025

CWE

CWE-401

Missing Release of Memory after Effective Lifetime

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