Microsoft Windows
CVE-2020-16922 — Windows Spoofing Vulnerability
Executive Summary
A spoofing vulnerability exists when Windows incorrectly validates file signatures. An attacker who successfully exploited this vulnerability could bypass security features and load improperly signed files. In an attack scenario, an attacker could bypass security features intended to prevent improperly signed files from being loaded. The update addresses the vulnerability by correcting how Windows validates file signatures.
Overview
5.3
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
Low
INTEGRITY
Low
AVAILABILITY
Low
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 4.8
EPSS Score
0.008
probability of exploitation in the next 30 days
0.52816 percentile - updated 2026-07-25
View on FIRST.org
Affected Products
30 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4580327 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 for x64-based Systems | 4580327 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4580346 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4580346 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1709 for 32-bit Systems | 4580328 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1709 for ARM64-based Systems | 4580328 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4580328 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4580330 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4580330 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4580330 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4577668 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4577668 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4577668 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1903 for 32-bit Systems | 4577671 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1903 for ARM64-based Systems | 4577671 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1903 for x64-based Systems | 4577671 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 4577671 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 4577671 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1909 for x64-based Systems | 4577671 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 2004 for 32-bit Systems | 4579311 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 2004 for ARM64-based Systems | 4579311 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 2004 for x64-based Systems | 4579311 (Security Update) |
Important | Spoofing | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 4580345 (Monthly Rollup) 4580387 (Security Only) Important Spoofing 4577051 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes 4580345 4580387 Windows 7 for x64-based Systems Service Pack 1 4580345 (Monthly Rollup) 4580387 (Security Only) Important Spoofing 4577051 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes 4580345 4580387 Windows 8.1 for 32-bit systems 4580347 (Monthly Rollup) 4580358 (Security Only) Important Spoofing 4577066 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes 4580347 4580358 Windows 8.1 for x64-based systems 4580347 (Monthly Rollup) 4580358 (Security Only) Important Spoofing 4577066 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes 4580347 4580358 Windows RT 8.1 | 4580347 (Monthly Rollup) |
Important | Spoofing | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 4580378 (Monthly Rollup) 4580385 (Security Only) Important Spoofing 4577064 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes 4580378 4580385 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4580378 (Monthly Rollup) 4580385 (Security Only) Important Spoofing 4577064 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes 4580378 4580385 Windows Server 2008 for x64-based Systems Service Pack 2 4580378 (Monthly Rollup) 4580385 (Security Only) Important Spoofing 4577064 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes 4580378 4580385 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4580378 (Monthly Rollup) 4580385 (Security Only) Important Spoofing 4577064 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes 4580378 4580385 Windows Server 2008 R2 for x64-based Systems Service Pack 1 4580345 (Monthly Rollup) 4580387 (Security Only) Important Spoofing 4577051 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes 4580345 4580387 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4580345 (Monthly Rollup) 4580387 (Security Only) Important Spoofing 4577051 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes 4580345 4580387 Windows Server 2012 4580382 (Monthly Rollup) 4580353 (Security Only) Important Spoofing 4577038 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes 4580382 4580353 Windows Server 2012 (Server Core installation) 4580382 (Monthly Rollup) 4580353 (Security Only) Important Spoofing 4577038 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes 4580382 4580353 Windows Server 2012 R2 4580347 (Monthly Rollup) 4580358 (Security Only) Important Spoofing 4577066 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes 4580347 4580358 Windows Server 2012 R2 (Server Core installation) 4580347 (Monthly Rollup) 4580358 (Security Only) Important Spoofing 4577066 Base: 5.3 Temporal: 4.8 Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C Yes 4580347 4580358 Windows Server 2016 | 4580346 (Security Update) |
Important | Spoofing | Yes |
| Windows Server 2016 (Server Core installation) | 4580346 (Security Update) |
Important | Spoofing | Yes |
| Windows Server 2019 | 4577668 (Security Update) |
Important | Spoofing | Yes |
| Windows Server 2019 (Server Core installation) | 4577668 (Security Update) |
Important | Spoofing | Yes |
| Windows Server, version 1903 (Server Core installation) | 4577671 (Security Update) |
Important | Spoofing | Yes |
| Windows Server, version 1909 (Server Core installation) | 4577671 (Security Update) |
Important | Spoofing | Yes |
| Windows Server, version 2004 (Server Core installation) | 4579311 (Security Update) |
Important | Spoofing | Yes |
Patches
8 patches
| Article | Type | Restart |
|---|---|---|
4580327 |
Security Update | Yes |
4580346 |
Security Update | Yes |
4580328 |
Security Update | Yes |
4580330 |
Security Update | Yes |
4577668 |
Security Update | Yes |
4577671 |
Security Update | Yes |
4579311 |
Security Update | Yes |
4580347 |
Monthly Rollup | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
RedDrip Team (@RedDrip7) of QiAnXin TIC (https://ti.qianxin.com)
References
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