Windows Installer
CVE-2021-1727 — Windows Installer Elevation of Privilege Vulnerability
Executive Summary
None
Overview
7.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
More Likely
MS Exploit Likelihood
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
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.0
EPSS Score
0.00756
probability of exploitation in the next 30 days
0.51384 percentile - updated 2026-07-25
View on FIRST.org
Affected Products
26 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4601331 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 for x64-based Systems | 4601331 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4601318 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4601318 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4601354 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4601354 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4601354 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4601345 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4601345 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4601345 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 4601315 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 4601315 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1909 for x64-based Systems | 4601315 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 2004 for 32-bit Systems | 4601319 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 2004 for ARM64-based Systems | 4601319 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 2004 for x64-based Systems | 4601319 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 20H2 for 32-bit Systems | 4601319 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 20H2 for ARM64-based Systems | 4601319 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 4601347 (Monthly Rollup) 4601363 (Security Only) Important Elevation of Privilege 4598279 Base: 7.8 Temporal: 7.0 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 Yes 4601347 4601363 Windows 7 for x64-based Systems Service Pack 1 4601347 (Monthly Rollup) 4601363 (Security Only) Important Elevation of Privilege 4598279 Base: 7.8 Temporal: 7.0 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 Yes 4601347 4601363 Windows 8.1 for 32-bit systems 4601384 (Monthly Rollup) 4601349 (Security Only) Important Elevation of Privilege 4598285 Base: 7.8 Temporal: 7.0 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 Yes 4601384 4601349 Windows 8.1 for x64-based systems 4601384 (Monthly Rollup) 4601349 (Security Only) Important Elevation of Privilege 4598285 Base: 7.8 Temporal: 7.0 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 Yes 4601384 4601349 Windows RT 8.1 | 4601384 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 4601360 (Monthly Rollup) 4601366 (Security Only) Important Elevation of Privilege 4598288 Base: 7.8 Temporal: 7.0 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 Yes 4601360 4601366 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4601360 (Monthly Rollup) 4601366 (Security Only) Important Elevation of Privilege 4598288 Base: 7.8 Temporal: 7.0 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 Yes 4601360 4601366 Windows Server 2008 for x64-based Systems Service Pack 2 4601360 (Monthly Rollup) 4601366 (Security Only) Important Elevation of Privilege 4598288 Base: 7.8 Temporal: 7.0 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 Yes 4601360 4601366 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4601360 (Monthly Rollup) 4601366 (Security Only) Important Elevation of Privilege 4598288 Base: 7.8 Temporal: 7.0 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 Yes 4601360 4601366 Windows Server 2008 R2 for x64-based Systems Service Pack 1 4601347 (Monthly Rollup) 4601363 (Security Only) Important Elevation of Privilege 4598279 Base: 7.8 Temporal: 7.0 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 Yes 4601347 4601363 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4601347 (Monthly Rollup) 4601363 (Security Only) Important Elevation of Privilege 4598279 Base: 7.8 Temporal: 7.0 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 Yes 4601347 4601363 Windows Server 2012 4601348 (Monthly Rollup) 4601357 (Security Only) Important Elevation of Privilege 4598278 Base: 7.8 Temporal: 7.0 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 Yes 4601348 4601357 Windows Server 2012 (Server Core installation) 4601348 (Monthly Rollup) 4601357 (Security Only) Important Elevation of Privilege 4598278 Base: 7.8 Temporal: 7.0 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 Yes 4601348 4601357 Windows Server 2012 R2 4601384 (Monthly Rollup) 4601349 (Security Only) Important Elevation of Privilege 4598285 Base: 7.8 Temporal: 7.0 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 Yes 4601384 4601349 Windows Server 2012 R2 (Server Core installation) 4601384 (Monthly Rollup) 4601349 (Security Only) Important Elevation of Privilege 4598285 Base: 7.8 Temporal: 7.0 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 Yes 4601384 4601349 Windows Server 2016 | 4601318 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2016 (Server Core installation) | 4601318 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 | 4601345 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 (Server Core installation) | 4601345 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server, version 1909 (Server Core installation) | 4601315 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server, version 2004 (Server Core installation) | 4601319 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server, version 20H2 (Server Core Installation) | 4601319 (Security Update) |
Important | Elevation of Privilege | Yes |
Patches
7 patches
| Article | Type | Restart |
|---|---|---|
4601331 |
Security Update | Yes |
4601318 |
Security Update | Yes |
4601354 |
Security Update | Yes |
4601345 |
Security Update | Yes |
4601315 |
Security Update | Yes |
4601319 |
Security Update | Yes |
4601384 |
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
None
References
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