Stack-based Buffer Overflow in Microsoft LSASS

Publication date: 2026-09-08

Last updated on: 2026-09-08

Assigner: Microsoft Corporation

Description

Stack-based buffer overflow in Microsoft Local Security Authority Server (lsasrv) allows an authorized attacker to elevate privileges locally.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-08

Generated

2026-09-09

AI Q&A

2026-09-09

EPSS Evaluated

N/A

NVD

CVE-2026-69277

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	local_security_authority_server	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

This is a stack-based buffer overflow vulnerability in Microsoft's Local Security Authority Server (lsasrv). It allows an authorized attacker with local access to escalate privileges by exploiting a flaw that overwrites memory on the stack.

Impact Analysis

An attacker could exploit this to gain higher privileges on your system, potentially allowing them to install programs, view or delete data, or create new accounts with full user rights. This requires the attacker to already have some level of access to the system.

Mitigation Strategies

Apply the latest security updates from Microsoft to patch the Local Security Authority Server (lsasrv) component. Monitor Microsoft's security advisories for patches and follow their recommended mitigation steps.

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