7.8
High
Exploited
· ransomware
CVE-2021-43226 Microsoft Windows Privilege Escalation Vulnerability
Active exploitation observed
· CISA KEV catalogue
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Ransomware campaigns
Known to be used
Description
Windows Common Log File System Driver Elevation of Privilege Vulnerability
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 Version 1809 10.0 | 10.0.0 → < 10.0.17763.2366 | 10.0.17763.2366 |
| Windows Server 2019 10.0 | 10.0.0 → < 10.0.17763.2366 | 10.0.17763.2366 |
| Windows Server 2019 (Server Core installation) 10.0 | 10.0.0 → < 10.0.17763.2366 | 10.0.17763.2366 |
| Windows 10 Version 1909 10.0 | 10.0.0 → < 10.0.18363.1977 | 10.0.18363.1977 |
| Windows 10 Version 21H1 10.0 | 10.0.0 → < 10.0.19043.1415 | 10.0.19043.1415 |
| Windows Server 2022 10.0 | 10.0.0 → < 10.0.20348.405 | 10.0.20348.405 |
| Windows 10 Version 2004 10.0 | 10.0.0 → < 10.0.19041.1415 | 10.0.19041.1415 |
| Windows Server version 2004 10.0 | 10.0.0 → < 10.0.19041.1415 | 10.0.19041.1415 |
| Windows 10 Version 20H2 10.0 | 10.0.0 → < 10.0.19042.1415 | 10.0.19042.1415 |
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| Product | Affected versions | Fixed in |
|---|---|---|
| Windows Server version 20H2 10.0 | 10.0.0 → < 10.0.19042.1415 | 10.0.19042.1415 |
| Windows 11 version 21H2 10.0 | 10.0.0 → < 10.0.22000.376 | 10.0.22000.376 |
| Windows 10 Version 21H2 10.0 | 10.0.0 → < 10.0.19044.1415 | 10.0.19044.1415 |
| Windows 10 Version 1507 10.0 | 10.0.0 → < 10.0.10240.19145 | 10.0.10240.19145 |
| Windows 10 Version 1607 10.0 | 10.0.0 → < 10.0.14393.4825 | 10.0.14393.4825 |
| Windows Server 2016 10.0 | 10.0.0 → < 10.0.14393.4825 | 10.0.14393.4825 |
| Windows Server 2016 (Server Core installation) 10.0 | 10.0.0 → < 10.0.14393.4825 | 10.0.14393.4825 |
| Windows 7 6.1 | 6.1.0 → < 6.1.7601.25796 | 6.1.7601.25796 |
| Windows 7 Service Pack 1 6.1 | 6.1.0 → < 6.1.7601.25796 | 6.1.7601.25796 |
| Windows 8.1 6.3 | 6.3.0 → < 6.3.9600.20207 | 6.3.9600.20207 |
| Windows Server 2008 Service Pack 2 6.0 | 6.0.0 → < 6.0.6003.21309 | 6.0.6003.21309 |
| Windows Server 2008 Service Pack 2 (Server Core installation) 6.0 | 6.0.0 → < 6.0.6003.21309 | 6.0.6003.21309 |
| Windows Server 2008 Service Pack 2 6.0 | 6.0.0 → < 6.0.6003.21309 | 6.0.6003.21309 |
| Windows Server 2008 R2 Service Pack 1 6.1 | 6.1.0 → < 6.1.7601.25796 | 6.1.7601.25796 |
| Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.0 | 6.0.0 → < 6.1.7601.25796 | 6.1.7601.25796 |
| Windows Server 2012 6.2 | 6.2.0 → < 6.2.9200.23545 | 6.2.9200.23545 |
| Windows Server 2012 (Server Core installation) 6.2 | 6.2.0 → < 6.2.9200.23545 | 6.2.9200.23545 |
| Windows Server 2012 R2 6.3 | 6.3.0 → < 6.3.9600.20207 | 6.3.9600.20207 |
| Windows Server 2012 R2 (Server Core installation) 6.3 | 6.3.0 → < 6.3.9600.20207 | 6.3.9600.20207 |
References
- portal.msrc.microsoft.com portal.msrc.microsoft.com
Timeline
- Published
- Added to the KEV catalogue
- Last modified
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