<p>A security feature bypass vulnerability exists when Microsoft Windows fails to handle file creation permissions, which could allow an attacker to create files in a protected Unified Extensible Firmware Interface (UEFI) location.</p>
<p>To exploit this vulnerability, an attacker could run a specially crafted application to bypass Unified Extensible Firmware Interface (UEFI) variable security in Windows.</p>
<p>The security update addresses the vulnerability by correcting security feature behavior to enforce permissions.</p>
An official patch is available. Apply the patch as soon as possible.
CVSS v4.0 Metrics
Exploitability
Attack VectorLocal
ComplexityLow
RequirementsPresent
PrivilegesNone
User InteractionNone
Threat
Exploit MaturityPoC
Vulnerable System
ConfidentialityNone
IntegrityHigh
AvailabilityNone
Subsequent System
ConfidentialityNone
IntegrityNone
AvailabilityNone
Supplemental
SafetyNegligible
AutomatableYes
RecoveryAutomatic
Value DensityConcentrated
UrgencyMedium
Patch StatusOfficial Patch
Change Log
| Date | Source | Changes | Score |
|---|
| 2026-07-21 | nvd | patch: Unavailable→Official Patch | 5.0 → 5.0 |
| 2026-07-21 | cve.org | initial, patch: Unavailable | 5.0 |
Affected Software
| Vendor | Product | Version |
|---|
| Microsoft | Windows 10 Version 1507 | ≥ 10.0.0, < publication |
| Microsoft | Windows 10 Version 1607 | ≥ 10.0.0, < publication |
| Microsoft | Windows 10 Version 1709 | ≥ 10.0.0, < publication |
| Microsoft | Windows 10 Version 1709 for 32-bit Systems | ≥ 10.0.0, < publication |
| Microsoft | Windows 10 Version 1803 | ≥ 10.0.0, < publication |
| Microsoft | Windows 10 Version 1809 | ≥ 10.0.0, < publication |
| Microsoft | Windows 10 Version 1903 for 32-bit Systems | ≥ 10.0.0, < publication |
| Microsoft | Windows 10 Version 1903 for ARM64-based Systems | ≥ 10.0.0, < publication |
| Microsoft | Windows 10 Version 1903 for x64-based Systems | ≥ 10.0.0, < publication |
| Microsoft | Windows 10 Version 1909 | ≥ 10.0.0, < publication |
| Microsoft | Windows 10 Version 2004 | ≥ 10.0.0, < publication |
| Microsoft | Windows Server 2016 | ≥ 10.0.0, < publication |
| Microsoft | Windows Server 2016 (Server Core installation) | ≥ 10.0.0, < publication |
| Microsoft | Windows Server 2019 | ≥ 10.0.0, < publication |
| Microsoft | Windows Server 2019 (Server Core installation) | ≥ 10.0.0, < publication |
| Microsoft | Windows Server version 2004 | ≥ 10.0.0, < publication |
| Microsoft | Windows Server, version 1903 (Server Core installation) | ≥ 10.0.0, < publication |
| Microsoft | Windows Server, version 1909 (Server Core installation) | ≥ 10.0.0, < publication |
| microsoft | windows_10 | All versions |
| microsoft | windows_10 | 1607 |
| microsoft | windows_10 | 1709 |
| microsoft | windows_10 | 1803 |
| microsoft | windows_10 | 1809 |
| microsoft | windows_10 | 1903 |
| microsoft | windows_10 | 1909 |
| microsoft | windows_10 | 2004 |
| microsoft | windows_server_2016 | All versions |
| microsoft | windows_server_2016 | 1903 |
| microsoft | windows_server_2016 | 1909 |
| microsoft | windows_server_2016 | 2004 |
| microsoft | windows_server_2019 | All versions |
Published: 2020-10-16
