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Microsoft Windows

CVE-2020-1303 — Windows Runtime Elevation of Privilege Vulnerability

Important CVSS 5.5 EPSS 0.04256 2020-09 archive

Executive Summary

An elevation of privilege vulnerability exists when the Windows Runtime improperly handles objects in memory. An attacker who successfully exploited this vulnerability could run arbitrary code in an elevated context. An attacker could exploit this vulnerability by running a specially crafted application on the victim system. The update addresses the vulnerability by correcting the way the Windows Runtime handles objects in memory.

Overview

5.5
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Elevation of Privilege
Released Sep 8 2020
Last Updated Sep 8 2020
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.04256 — 0.89776 percentile
NVD CVSS 5.5 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 5.0

EPSS Score

0.04256
probability of exploitation in the next 30 days
0.89776 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 4577032 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1803 for ARM64-based Systems 4577032 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1803 for x64-based Systems 4577032 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for 32-bit Systems 4570333 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for ARM64-based Systems 4570333 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1809 for x64-based Systems 4570333 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for 32-bit Systems 4574727 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for ARM64-based Systems 4574727 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1903 for x64-based Systems 4574727 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1909 for 32-bit Systems 4574727 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1909 for ARM64-based Systems 4574727 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 1909 for x64-based Systems 4574727 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 2004 for 32-bit Systems 4571756 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 2004 for ARM64-based Systems 4571756 (Security Update) Important Elevation of Privilege Yes
Windows 10 Version 2004 for x64-based Systems 4571756 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 4570333 (Security Update) Important Elevation of Privilege Yes
Windows Server 2019 (Server Core installation) 4570333 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 1903 (Server Core installation) 4574727 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 1909 (Server Core installation) 4574727 (Security Update) Important Elevation of Privilege Yes
Windows Server, version 2004 (Server Core installation) 4571756 (Security Update) Important Elevation of Privilege Yes

Patches

4 patches
Article Type Restart
4577032 Security Update Yes
4570333 Security Update Yes
4574727 Security Update Yes
4571756 Security Update Yes

Known Exploits

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