Windows Installer
CVE-2020-0859 — Windows Modules Installer Service Information Disclosure Vulnerability
Executive Summary
An information vulnerability exists when Windows Modules Installer Service improperly discloses file information. Successful exploitation of the vulnerability could allow the attacker to read any file on the file system. To exploit the vulnerability, an attacker would have to log onto an affected system and run a specially crafted application. The update addresses the vulnerability by changing the way Windows Modules Installer Service discloses file information.
Overview
5.5
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
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
0.01278
probability of exploitation in the next 30 days
0.66189 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
27 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4540693 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 for x64-based Systems | 4540693 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4540670 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4540670 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1709 for 32-bit Systems | 4540681 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1709 for ARM64-based Systems | 4540681 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4540681 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4540689 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4540689 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4540689 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4538461 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4538461 (Security Update) |
Important | Information Disclosure | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4538461 (Security Update) |
Important | Information Disclosure | Yes |
| 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 8.1 for 32-bit systems 4541509 (Monthly Rollup) 4541505 (Security Only) Important Information Disclosure 4537821 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes 4541509 4541505 Windows 8.1 for x64-based systems 4541509 (Monthly Rollup) 4541505 (Security Only) Important Information Disclosure 4537821 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes 4541509 4541505 Windows RT 8.1 | 4541509 (Monthly Rollup) |
Important | Information Disclosure | Yes |
| Windows Server 2012 4541510 (Monthly Rollup) 4540694 (Security Only) Important Information Disclosure 4537814 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes 4541510 4540694 Windows Server 2012 (Server Core installation) 4541510 (Monthly Rollup) 4540694 (Security Only) Important Information Disclosure 4537814 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes 4541510 4540694 Windows Server 2012 R2 4541509 (Monthly Rollup) 4541505 (Security Only) Important Information Disclosure 4537821 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes 4541509 4541505 Windows Server 2012 R2 (Server Core installation) 4541509 (Monthly Rollup) 4541505 (Security Only) Important Information Disclosure 4537821 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes 4541509 4541505 Windows Server 2016 | 4540670 (Security Update) |
Important | Information Disclosure | Yes |
| Windows Server 2016 (Server Core installation) | 4540670 (Security Update) |
Important | Information Disclosure | Yes |
| Windows Server 2019 | 4538461 (Security Update) |
Important | Information Disclosure | Yes |
| Windows Server 2019 (Server Core installation) | 4538461 (Security Update) |
Important | Information Disclosure | Yes |
| Windows Server, version 1803 (Server Core Installation) | 4540689 (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
7 patches
| Article | Type | Restart |
|---|---|---|
4540693 |
Security Update | Yes |
4540670 |
Security Update | Yes |
4540681 |
Security Update | Yes |
4540689 |
Security Update | Yes |
4538461 |
Security Update | Yes |
4540673 |
Security Update | Yes |
4541509 |
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
Edward Torkington of NCC Group https://www.nccgroup.trust/
References
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