HIGH
Windows Installer Elevation of Privilege Vulnerability
Published Dec 15, 2021
7.8
HIGHCVSS 3.1
EPSS 11.96%
Description
Windows Installer Elevation of Privilege Vulnerability
Affected products
-
- Version 10.0.0StatusaffectedConstraints<10.0.10240.19145
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.14393.4825
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.17763.2366
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.18363.1977
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.19041.1415
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.19042.1415
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.19043.1415
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.19044.1415
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.22000.376
- Version
-
- Version 6.1.0StatusaffectedConstraints<6.1.7601.25796
- Version
-
- Version 6.1.0StatusaffectedConstraints<6.1.7601.25796
- Version
-
- Version 6.3.0StatusaffectedConstraints<6.3.9600.20207
- Version
-
- Version 6.0.0StatusaffectedConstraints<6.0.6003.21309
- Version
-
- Version 6.1.0StatusaffectedConstraints<6.1.7601.25796
- Version
- Vendor Microsoft Product Windows Server 2008 R2 Service Pack 1 (Server Core installation) Defaultn/a
- Version 6.0.0StatusaffectedConstraints<6.1.7601.25796
- Version
-
- Version 6.0.0StatusaffectedConstraints<6.0.6003.21309
- Version
-
- Version 6.0.0StatusaffectedConstraints<6.0.6003.21309
- Version
-
- Version 6.2.0StatusaffectedConstraints<6.2.9200.23540
- Version 6.2.0StatusaffectedConstraints<6.2.9200.23545
- Version
-
- Version 6.2.0StatusaffectedConstraints<6.2.9200.23540
- Version 6.2.0StatusaffectedConstraints<6.2.9200.23545
- Version
-
- Version 6.3.0StatusaffectedConstraints<6.3.9600.20207
- Version
-
- Version 6.3.0StatusaffectedConstraints<6.3.9600.20207
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.14393.4825
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.14393.4825
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.17763.2366
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.17763.2366
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.20348.405
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.19041.1415
- Version
-
- Version 10.0.0StatusaffectedConstraints<10.0.19042.1415
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Windows 10 Version 1507 | n/a |
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| Microsoft | Windows 10 Version 1607 | n/a |
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| Microsoft | Windows 10 Version 1809 | n/a |
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| Microsoft | Windows 10 Version 1909 | n/a |
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| Microsoft | Windows 10 Version 2004 | n/a |
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| Microsoft | Windows 10 Version 20H2 | n/a |
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| Microsoft | Windows 10 Version 21H1 | n/a |
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| Microsoft | Windows 10 Version 21H2 | n/a |
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| Microsoft | Windows 11 version 21H2 | n/a |
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| Microsoft | Windows 7 | n/a |
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| Microsoft | Windows 7 Service Pack 1 | n/a |
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| Microsoft | Windows 8.1 | n/a |
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| Microsoft | Windows Server 2008 Service Pack 2 | n/a |
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| Microsoft | Windows Server 2008 R2 Service Pack 1 | n/a |
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| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2008 Service Pack 2 | n/a |
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| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2012 | n/a |
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| Microsoft | Windows Server 2012 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2012 R2 | n/a |
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| Microsoft | Windows Server 2012 R2 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2016 | n/a |
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| Microsoft | Windows Server 2016 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2019 | n/a |
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| Microsoft | Windows Server 2019 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2022 | n/a |
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| Microsoft | Windows Server version 2004 | n/a |
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| Microsoft | Windows Server version 20H2 | n/a |
|
OR
- n/a
- n/a
- 20h2
- 20h2
- 20h2
- 21h1
- 21h1
- 21h1
- 21h2
- 21h2
- 21h2
- 1607
- 1607
- 1809
- 1809
- 1809
- 1909
- 1909
- 1909
- 2004
- 2004
- 2004
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- n/a
- 20h2
- 2022
- r2
- r2
- r2
- n/a
- r2
- n/a
- 2004
- n/a
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
7.8 HIGH NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
1 other source (CVE.org) ▾
7.8 HIGH CVE.org
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 Impact High
Integrity Impact High
Availability Impact High
Exploit Maturity Proof of Concept
No CVSS v3.0 score for this CVE.
4.6 MEDIUM NVD
AV:L/AC:L/Au:N/C:P/I:P/A:P
Access Vector Local
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed May 29, 2024 · SSVC 2.0.3
11.96% 0.11963
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
EPSS probability 0.11963
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (18 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 11.96% (0.11963) | 96.00th | v5 (v2026.06.15) |
| Jun 15, 2026 | 11.96% (0.11963) | 95.57th | v5 (v2026.06.15) |
| Oct 1, 2025 | 9.27% (0.09272) | 92.47th | v4 (v2025.03.14) |
| May 21, 2025 | 7.82% (0.07816) | 91.49th | v4 (v2025.03.14) |
| Mar 19, 2025 | 6.50% (0.06502) | 89.93th | v4 (v2025.03.14) |
| Mar 17, 2025 | 3.14% (0.03139) | 86.00th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00043) | 11.28th | v3 (v2023.03.01) |
| Jun 20, 2024 | 0.04% (0.00043) | 9.52th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00043) | 7.50th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.37% (0.01372) | 71.57th | v2 (v2022.01.01) |
| Feb 28, 2023 | 1.37% (0.01372) | 71.54th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.37% (0.01372) | 69.54th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.37% (0.01372) | 45.59th | v2 (v2022.01.01) |
| Feb 3, 2022 | 17.64% (0.17642) | 92.83th | v1 |
| Jan 6, 2022 | 17.64% (0.17642) | 92.74th | v1 |
| Dec 24, 2021 | 17.64% (0.17642) | 97.72th | v1 |
| Dec 18, 2021 | 1.84% (0.01840) | 76.25th | v1 |
| Dec 16, 2021 | 0.42% (0.00416) | 26.32th | v1 |
Weaknesses (0)
No CWE recorded.
References (1)
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43883 x_refsource_MISCPatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43883 | x_refsource_MISCPatchVendor Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner microsoft
Published Dec 15, 2021
Updated Aug 4, 2024
Reserved Nov 16, 2021
Link CVE-2021-43883
CISA Vulnrichment
Updated May 29, 2024