Microsoft Windows
CVE-2020-0876 — Win32k Information Disclosure Vulnerability
Executive Summary
An information disclosure vulnerability exists when the win32k component improperly provides kernel information. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user’s system. To exploit the vulnerability, an attacker would have to either log on locally to an affected system, or convince a locally authenticated user to execute a specially crafted application. The security update addresses the vulnerability by correcting how win32k handles objects in memory.
Overview
7.5
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.3
EPSS Score
0.058
probability of exploitation in the next 30 days
0.92146 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
8 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 Version 1903 for 32-bit Systems | 4540673 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1903 for ARM64-based Systems | 4540673 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1903 for x64-based Systems | 4540673 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 4540673 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 4540673 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1909 for x64-based Systems | 4540673 (Security Update) |
Important | Information Disclosure | Yes |
| Windows Server, version 1903 (Server Core installation) | 4540673 (Security Update) |
Important | Information Disclosure | Yes |
| Windows Server, version 1909 (Server Core installation) | 4540673 (Security Update) |
Important | Information Disclosure | Yes |
Patches
1 patch
| Article | Type | Restart |
|---|---|---|
4540673 |
Security Update | 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
JunGu and ZiMi of Alibaba Orion Security Lab
References
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