CVE-2026-20876: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 11 version 22H3
Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
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.
CVE-2026-20876: CWE-122: Heap-based Buffer Overflow in Microsoft 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
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.
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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