Windows Installer
CVE-2021-43883 — 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
0.11963
probability of exploitation in the next 30 days
0.95585 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
32 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 5008230 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 for x64-based Systems | 5008230 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 5008207 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for x64-based Systems | 5008207 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 5008218 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 5008218 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for x64-based Systems | 5008218 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 5008206 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 5008206 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1909 for x64-based Systems | 5008206 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 2004 for 32-bit Systems | 5008212 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 2004 for ARM64-based Systems | 5008212 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 2004 for x64-based Systems | 5008212 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 20H2 for 32-bit Systems | 5008212 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 20H2 for ARM64-based Systems | 5008212 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H1 for 32-bit Systems | 5008212 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H1 for ARM64-based Systems | 5008212 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H1 for x64-based Systems | 5008212 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for 32-bit Systems | 5008212 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for ARM64-based Systems | 5008212 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for x64-based Systems | 5008212 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 version 21H2 for ARM64-based Systems | 5008215 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 version 21H2 for x64-based Systems | 5008215 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 5008244 (Monthly Rollup) 5008282 (Security Only) Important Elevation of Privilege 5007236 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 6.1.7601.25796 Yes 5008244 5008282 Windows 7 for x64-based Systems Service Pack 1 5008244 (Monthly Rollup) 5008282 (Security Only) Important Elevation of Privilege 5007236 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 6.1.7601.25796 Yes 5008244 5008282 Windows 8.1 for 32-bit systems 5008263 (Monthly Rollup) 5008285 (Security Only) Important Elevation of Privilege 5007247 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 6.3.9600.20207 Yes 5008263 5008285 Windows 8.1 for x64-based systems 5008263 (Monthly Rollup) 5008285 (Security Only) Important Elevation of Privilege 5007247 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 6.3.9600.20207 Yes 5008263 5008285 Windows RT 8.1 | 5008263 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 5008274 (Monthly Rollup) 5008271 (Security Only) Important Elevation of Privilege 5007263 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 6.0.6003.21309 Yes 5008274 5008271 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 5008274 (Monthly Rollup) 5008271 (Security Only) Important Elevation of Privilege 5007263 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 6.0.6003.21309 Yes 5008274 5008271 Windows Server 2008 for x64-based Systems Service Pack 2 5008274 (Monthly Rollup) 5008271 (Security Only) Important Elevation of Privilege 5007263 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 6.0.6003.21309 Yes 5008274 5008271 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 5008274 (Monthly Rollup) 5008271 (Security Only) Important Elevation of Privilege 5007263 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 6.0.6003.21309 Yes 5008274 5008271 Windows Server 2008 R2 for x64-based Systems Service Pack 1 5008244 (Monthly Rollup) 5008282 (Security Only) Important Elevation of Privilege 5007236 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 6.1.7601.25796 Yes 5008244 5008282 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 5008244 (Monthly Rollup) 5008282 (Security Only) Important Elevation of Privilege 5007236 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 6.1.7601.25796 Yes 5008244 5008282 Windows Server 2012 5008277 (Monthly Rollup) 5008255 (Security Only) Important Elevation of Privilege 5007260 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 6.2.9200.23545 6.2.9200.23540 Yes 5008277 5008255 Windows Server 2012 (Server Core installation) 5008277 (Monthly Rollup) 5008255 (Security Only) Important Elevation of Privilege 5007260 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 6.2.9200.23545 6.2.9200.23540 Yes 5008277 5008255 Windows Server 2012 R2 5008263 (Monthly Rollup) 5008285 (Security Only) Important Elevation of Privilege 5007247 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 6.3.9600.20207 Yes 5008263 5008285 Windows Server 2012 R2 (Server Core installation) 5008263 (Monthly Rollup) 5008285 (Security Only) Important Elevation of Privilege 5007247 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 6.3.9600.20207 Yes 5008263 5008285 Windows Server 2016 | 5008207 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2016 (Server Core installation) | 5008207 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 | 5008218 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 (Server Core installation) | 5008218 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2022 | 5008223 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2022 (Server Core installation) | 5008223 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server, version 2004 (Server Core installation) | 5008212 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server, version 20H2 (Server Core Installation) | 5008212 (Security Update) |
Important | Elevation of Privilege | Yes |
Patches
8 patches
| Article | Type | Restart |
|---|---|---|
5008230 |
Security Update | Yes |
5008207 |
Security Update | Yes |
5008218 |
Security Update | Yes |
5008206 |
Security Update | Yes |
5008212 |
Security Update | Yes |
5008215 |
Security Update | Yes |
5008263 |
Monthly Rollup | Yes |
5008223 |
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
None
References
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