Null Pointer Dereference in Windows LSASS Causes Remote DoS

Publication date: 2026-01-13

Last updated on: 2026-01-13

Assigner: Microsoft Corporation

Description

Null pointer dereference in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.

CVSS Scores

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Meta Information

Published

2026-01-13

Last Modified

2026-01-13

Generated

2026-07-06

AI Q&A

2026-01-14

EPSS Evaluated

2026-07-05

NVD

CVE-2026-20875

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_local_security_authority_subsystem_service	*

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 in the Windows Local Security Authority Subsystem Service (LSASS) that allows an unauthorized attacker to cause a denial of service over a network. [1]

Impact Analysis

An attacker can exploit this vulnerability to cause a denial of service, making the affected system unavailable or unresponsive over the network. [1]

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