Vulnerability Intelligence Report
Windows Common Log File System Driver Elevation of Privilege Vulnerability
CVE-2021-43226
Windows Common Log File System Driver Elevation of Privilege Vulnerability
CISA KEV
SSVC: Active Exploitation
CVSS Base Score
7.8
HIGH
Exploitability:1.9
Impact Score:5.9
EPSS Probability:3.07%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
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Weaponization
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SSVC Action
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Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1809 | 10.0.0 < 10.0.17763.2366 (affected) |
| Microsoft | Windows Server 2019 | 10.0.0 < 10.0.17763.2366 (affected) |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.0 < 10.0.17763.2366 (affected) |
| Microsoft | Windows 10 Version 1909 | 10.0.0 < 10.0.18363.1977 (affected) |
| Microsoft | Windows 10 Version 21H1 | 10.0.0 < 10.0.19043.1415 (affected) |
| Microsoft | Windows Server 2022 | 10.0.0 < 10.0.20348.405 (affected) |
| Microsoft | Windows 10 Version 2004 | 10.0.0 < 10.0.19041.1415 (affected) |
| Microsoft | Windows Server version 2004 | 10.0.0 < 10.0.19041.1415 (affected) |
| Microsoft | Windows 10 Version 20H2 | 10.0.0 < 10.0.19042.1415 (affected) |
| Microsoft | Windows Server version 20H2 | 10.0.0 < 10.0.19042.1415 (affected) |
| Microsoft | Windows 11 version 21H2 | 10.0.0 < 10.0.22000.376 (affected) |
| Microsoft | Windows 10 Version 21H2 | 10.0.0 < 10.0.19044.1415 (affected) |
| Microsoft | Windows 10 Version 1507 | 10.0.0 < 10.0.10240.19145 (affected) |
| Microsoft | Windows 10 Version 1607 | 10.0.0 < 10.0.14393.4825 (affected) |
| Microsoft | Windows Server 2016 | 10.0.0 < 10.0.14393.4825 (affected) |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.0 < 10.0.14393.4825 (affected) |
| Microsoft | Windows 7 | 6.1.0 < 6.1.7601.25796 (affected) |
| Microsoft | Windows 7 Service Pack 1 | 6.1.0 < 6.1.7601.25796 (affected) |
| Microsoft | Windows 8.1 | 6.3.0 < 6.3.9600.20207 (affected) |
| Microsoft | Windows Server 2008 Service Pack 2 | 6.0.0 < 6.0.6003.21309 (affected) |
| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) | 6.0.0 < 6.0.6003.21309 (affected) |
| Microsoft | Windows Server 2008 Service Pack 2 | 6.0.0 < 6.0.6003.21309 (affected) |
| Microsoft | Windows Server 2008 R2 Service Pack 1 | 6.1.0 < 6.1.7601.25796 (affected) |
| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) | 6.0.0 < 6.1.7601.25796 (affected) |
| Microsoft | Windows Server 2012 | 6.2.0 < 6.2.9200.23545 (affected), 6.2.0 < 6.2.9200.23540 (affected) |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.0 < 6.2.9200.23545 (affected), 6.2.0 < 6.2.9200.23540 (affected) |
| Microsoft | Windows Server 2012 R2 | 6.3.0 < 6.3.9600.20207 (affected) |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.0 < 6.3.9600.20207 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Microsoft Corporation · Vendor · USA |
| Reserved | 2021-11-02T00:00:00 |
| Published | 2021-12-15T14:15:12 |
| Patch Date | 2021-12-14 |
| Last Updated | 2026-08-22T03:55:15 |
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