CVE-2026-83665

Analyzed Analyzed - Analysis Complete

Null pointer dereference in Windows DHCP Server

Publication date: 2026-10-13

Last updated on: 2026-10-29

Assigner: Microsoft Corporation

Description

Null pointer dereference in Windows DHCP Server allows an unauthorized attacker to deny service over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-29

Generated

2026-11-08

AI Q&A

2026-10-15

EPSS Evaluated

2026-11-07

NVD

CVE-2026-83665

EUVD

EUVD-2026-99940

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-476	The product dereferences a pointer that it expects to be valid but is NULL.

Attack-Flow Graph

Executive Summary

This vulnerability is a null pointer dereference flaw in the Windows DHCP Server. It allows an unauthorized attacker to cause a denial of service over a network by exploiting this issue.

Impact Analysis

The impact is a denial of service, meaning affected systems may become unavailable or unresponsive on the network. This could disrupt network services dependent on the DHCP Server.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Windows DHCP Server vulnerability. Monitor network traffic for unusual DHCP server activity that may indicate exploitation attempts.

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