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Microsoft Windows

CVE-2020-1431 — Windows AppX Deployment Extensions Elevation of Privilege Vulnerability

Important CVSS 7.8 EPSS 0.00739 2020-07 archive

Executive Summary

An elevation of privilege vulnerability exists when the Windows AppX Deployment Extensions improperly performs privilege management, resulting in access to system files. To exploit this vulnerability, an authenticated attacker would need to run a specially crafted application to elevate privileges. The security update addresses the vulnerability by correcting how AppX Deployment Extensions manages privileges.

Overview

7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Elevation of Privilege
Released Jul 14 2020
Last Updated Jul 14 2020
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00739 — 0.49707 percentile
NVD CVSS 7.8 HIGH — differs from MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.4

EPSS Score

0.00739
probability of exploitation in the next 30 days
0.49707 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

20 affected products
Product KB Article Severity Impact Restart Required
Windows 10 Version 1803 for 32-bit Systems 4565489 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1803 for ARM64-based Systems 4565489 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1803 for x64-based Systems 4565489 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for 32-bit Systems 4558998 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for ARM64-based Systems 4558998 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for x64-based Systems 4558998 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for 32-bit Systems 4565483 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for ARM64-based Systems 4565483 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for x64-based Systems 4565483 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1909 for 32-bit Systems 4565483 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1909 for ARM64-based Systems 4565483 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1909 for x64-based Systems 4565483 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 2004 for 32-bit Systems 4565503 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 2004 for ARM64-based Systems 4565503 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 2004 for x64-based Systems 4565503 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 4558998 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 (Server Core installation) 4558998 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 1903 (Server Core installation) 4565483 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 1909 (Server Core installation) 4565483 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 2004 (Server Core installation) 4565503 (Security Update) Important Elevation of Privilege Yes

Patches

4 patches
Article Type Restart
4565489 Security Update Yes
4558998 Security Update Yes
4565483 Security Update Yes
4565503 Security Update Yes

Known Exploits

Acknowledgments

@itm4n

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