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CVE-2026-20876: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 11 version 22H3

0
Medium
VulnerabilityCVE-2026-20876cvecve-2026-20876cwe-122
Published: Tue Jan 13 2026 (01/13/2026, 17:56:36 UTC)
Source: CVE Database V5
Vendor/Project: Microsoft
Product: Windows 11 version 22H3

Description

Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 04/03/2026, 12:48:19 UTC

Technical Analysis

This vulnerability involves a heap-based buffer overflow in the VBS Enclave of Windows 11 version 22H3, which can be exploited by an authorized local attacker with high privileges to elevate their privileges. The CVSS vector indicates the attack requires local access, low attack complexity, and high privileges but no user interaction. The impact includes high confidentiality, integrity, and availability consequences. Microsoft has published this vulnerability and a patch is available to remediate it.

Potential Impact

Successful exploitation of this vulnerability could allow an authorized local attacker to elevate privileges, potentially leading to full system compromise including unauthorized access to sensitive information, modification of system data, and disruption of system availability. The vulnerability affects confidentiality, integrity, and availability at a high level. However, exploitation requires existing high privileges and local access.

Mitigation Recommendations

A patch is available for this vulnerability. It is recommended to apply the official Microsoft update for Windows 11 version 22H3 (build 10.0.22631.0) to remediate this issue. Since the vulnerability requires local high privileges, ensuring systems are updated will prevent privilege escalation via this flaw.

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Technical Details

Data Version
5.2
Assigner Short Name
microsoft
Date Reserved
2025-12-03T05:54:20.389Z
Cvss Version
3.1
State
PUBLISHED

Threat ID: 69668ae1a60475309f9ae175

Added to database: 1/13/2026, 6:11:45 PM

Last enriched: 4/3/2026, 12:48:19 PM

Last updated: 5/10/2026, 9:11:53 AM

Views: 134

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