Windows Common Log File System Driver Elevation of Privilege Vulnerability
Priority CRITICAL 93Exploited in the wildPublished · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
Windows Common Log File System Driver Elevation of Privilege Vulnerability
Why it matters now
Exploitation Active In CISA KEV since 2025-10-06CISA due date 2025-10-27Known ransomware use
EPSS 0.03275 88th percentileScored 2026-11-07
Fix Fixed Windows 10 Version 1809 (Microsoft): 10.0.17763.2366Windows Server 2019 (Microsoft): 10.0.17763.2366+26 more products
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Active
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Windows 10 Version 1809 | 10.0.0 to before 10.0.17763.2366 | 10.0.17763.2366 | Patch available | CNA |
| Microsoft | Windows Server 2019 | 10.0.0 to before 10.0.17763.2366 | 10.0.17763.2366 | Patch available | CNA |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.0 to before 10.0.17763.2366 | 10.0.17763.2366 | Patch available | CNA |
| Microsoft | Windows 10 Version 1909 | 10.0.0 to before 10.0.18363.1977 | 10.0.18363.1977 | Patch available | CNA |
| Microsoft | Windows 10 Version 21H1 | 10.0.0 to before 10.0.19043.1415 | 10.0.19043.1415 | Patch available | CNA |
| Microsoft | Windows Server 2022 | 10.0.0 to before 10.0.20348.405 | 10.0.20348.405 | Patch available | CNA |
| Microsoft | Windows 10 Version 2004 | 10.0.0 to before 10.0.19041.1415 | 10.0.19041.1415 | Patch available | CNA |
| Microsoft | Windows Server version 2004 | 10.0.0 to before 10.0.19041.1415 | 10.0.19041.1415 | Patch available | CNA |
| Microsoft | Windows 10 Version 20H2 | 10.0.0 to before 10.0.19042.1415 | 10.0.19042.1415 | Patch available | CNA |
| Microsoft | Windows Server version 20H2 | 10.0.0 to before 10.0.19042.1415 | 10.0.19042.1415 | Patch available | CNA |
| Microsoft | Windows 11 version 21H2 | 10.0.0 to before 10.0.22000.376 | 10.0.22000.376 | Patch available | CNA |
| Microsoft | Windows 10 Version 21H2 | 10.0.0 to before 10.0.19044.1415 | 10.0.19044.1415 | Patch available | CNA |
| Microsoft | Windows 10 Version 1507 | 10.0.0 to before 10.0.10240.19145 | 10.0.10240.19145 | Patch available | CNA |
| Microsoft | Windows 10 Version 1607 | 10.0.0 to before 10.0.14393.4825 | 10.0.14393.4825 | Patch available | CNA |
| Microsoft | Windows Server 2016 | 10.0.0 to before 10.0.14393.4825 | 10.0.14393.4825 | Patch available | CNA |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.0 to before 10.0.14393.4825 | 10.0.14393.4825 | Patch available | CNA |
| Microsoft | Windows 7 | 6.1.0 to before 6.1.7601.25796 | 6.1.7601.25796 | Patch available | CNA |
| Microsoft | Windows 7 Service Pack 1 | 6.1.0 to before 6.1.7601.25796 | 6.1.7601.25796 | Patch available | CNA |
| Microsoft | Windows 8.1 | 6.3.0 to before 6.3.9600.20207 | 6.3.9600.20207 | Patch available | CNA |
| Microsoft | Windows Server 2008 Service Pack 2 | 6.0.0 to before 6.0.6003.21309 | 6.0.6003.21309 | Patch available | CNA |
| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) | 6.0.0 to before 6.0.6003.21309 | 6.0.6003.21309 | Patch available | CNA |
| Microsoft | Windows Server 2008 Service Pack 2 | 6.0.0 to before 6.0.6003.21309 | 6.0.6003.21309 | Patch available | CNA |
| Microsoft | Windows Server 2008 R2 Service Pack 1 | 6.1.0 to before 6.1.7601.25796 | 6.1.7601.25796 | Patch available | CNA |
| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) | 6.0.0 to before 6.1.7601.25796 | 6.1.7601.25796 | Patch available | CNA |
| Microsoft | Windows Server 2012 | 6.2.0 to before 6.2.9200.23545; 6.2.0 to before 6.2.9200.23540 | 6.2.9200.23545, 6.2.9200.23540 | Patch available | CNA |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.0 to before 6.2.9200.23545; 6.2.0 to before 6.2.9200.23540 | 6.2.9200.23545, 6.2.9200.23540 | Patch available | CNA |
| Microsoft | Windows Server 2012 R2 | 6.3.0 to before 6.3.9600.20207 | 6.3.9600.20207 | Patch available | CNA |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.0 to before 6.3.9600.20207 | 6.3.9600.20207 | Patch available | CNA |
- Windows 10 Version 1809 VendorMicrosoft Affected 10.0.0 to before 10.0.17763.2366 Fixed in 10.0.17763.2366 Patch available CNA
- Windows Server 2019 VendorMicrosoft Affected 10.0.0 to before 10.0.17763.2366 Fixed in 10.0.17763.2366 Patch available CNA
- Windows Server 2019 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before 10.0.17763.2366 Fixed in 10.0.17763.2366 Patch available CNA
- Windows 10 Version 1909 VendorMicrosoft Affected 10.0.0 to before 10.0.18363.1977 Fixed in 10.0.18363.1977 Patch available CNA
- Windows 10 Version 21H1 VendorMicrosoft Affected 10.0.0 to before 10.0.19043.1415 Fixed in 10.0.19043.1415 Patch available CNA
- Windows Server 2022 VendorMicrosoft Affected 10.0.0 to before 10.0.20348.405 Fixed in 10.0.20348.405 Patch available CNA
- Windows 10 Version 2004 VendorMicrosoft Affected 10.0.0 to before 10.0.19041.1415 Fixed in 10.0.19041.1415 Patch available CNA
- Windows Server version 2004 VendorMicrosoft Affected 10.0.0 to before 10.0.19041.1415 Fixed in 10.0.19041.1415 Patch available CNA
- Windows 10 Version 20H2 VendorMicrosoft Affected 10.0.0 to before 10.0.19042.1415 Fixed in 10.0.19042.1415 Patch available CNA
- Windows Server version 20H2 VendorMicrosoft Affected 10.0.0 to before 10.0.19042.1415 Fixed in 10.0.19042.1415 Patch available CNA
- Windows 11 version 21H2 VendorMicrosoft Affected 10.0.0 to before 10.0.22000.376 Fixed in 10.0.22000.376 Patch available CNA
- Windows 10 Version 21H2 VendorMicrosoft Affected 10.0.0 to before 10.0.19044.1415 Fixed in 10.0.19044.1415 Patch available CNA
- Windows 10 Version 1507 VendorMicrosoft Affected 10.0.0 to before 10.0.10240.19145 Fixed in 10.0.10240.19145 Patch available CNA
- Windows 10 Version 1607 VendorMicrosoft Affected 10.0.0 to before 10.0.14393.4825 Fixed in 10.0.14393.4825 Patch available CNA
- Windows Server 2016 VendorMicrosoft Affected 10.0.0 to before 10.0.14393.4825 Fixed in 10.0.14393.4825 Patch available CNA
- Windows Server 2016 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before 10.0.14393.4825 Fixed in 10.0.14393.4825 Patch available CNA
- Windows 7 VendorMicrosoft Affected 6.1.0 to before 6.1.7601.25796 Fixed in 6.1.7601.25796 Patch available CNA
- Windows 7 Service Pack 1 VendorMicrosoft Affected 6.1.0 to before 6.1.7601.25796 Fixed in 6.1.7601.25796 Patch available CNA
- Windows 8.1 VendorMicrosoft Affected 6.3.0 to before 6.3.9600.20207 Fixed in 6.3.9600.20207 Patch available CNA
- Windows Server 2008 Service Pack 2 VendorMicrosoft Affected 6.0.0 to before 6.0.6003.21309 Fixed in 6.0.6003.21309 Patch available CNA
- Windows Server 2008 Service Pack 2 (Server Core installation) VendorMicrosoft Affected 6.0.0 to before 6.0.6003.21309 Fixed in 6.0.6003.21309 Patch available CNA
- Windows Server 2008 Service Pack 2 VendorMicrosoft Affected 6.0.0 to before 6.0.6003.21309 Fixed in 6.0.6003.21309 Patch available CNA
- Windows Server 2008 R2 Service Pack 1 VendorMicrosoft Affected 6.1.0 to before 6.1.7601.25796 Fixed in 6.1.7601.25796 Patch available CNA
- Windows Server 2008 R2 Service Pack 1 (Server Core installation) VendorMicrosoft Affected 6.0.0 to before 6.1.7601.25796 Fixed in 6.1.7601.25796 Patch available CNA
- Windows Server 2012 VendorMicrosoft Affected 6.2.0 to before 6.2.9200.23545; 6.2.0 to before 6.2.9200.23540 Fixed in 6.2.9200.23545, 6.2.9200.23540 Patch available CNA
- Windows Server 2012 (Server Core installation) VendorMicrosoft Affected 6.2.0 to before 6.2.9200.23545; 6.2.0 to before 6.2.9200.23540 Fixed in 6.2.9200.23545, 6.2.9200.23540 Patch available CNA
- Windows Server 2012 R2 VendorMicrosoft Affected 6.3.0 to before 6.3.9600.20207 Fixed in 6.3.9600.20207 Patch available CNA
- Windows Server 2012 R2 (Server Core installation) VendorMicrosoft Affected 6.3.0 to before 6.3.9600.20207 Fixed in 6.3.9600.20207 Patch available CNA
CPE configurations NVD · 25
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x64:* | before 10.0.10240.19145 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x86:* | before 10.0.10240.19145 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:* | before 10.0.14393.4825 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:* | before 10.0.14393.4825 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:* | before 10.0.17763.2366 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:* | before 10.0.18363.1977 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:* | before 10.0.19041.1415 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:arm64:* | before 10.0.19042.1415 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:x86:* | before 10.0.19042.1415 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:* | before 10.0.19043.1415 | Vulnerable | Microsoft |
- cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x64:* Versions before 10.0.10240.19145 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x86:* Versions before 10.0.10240.19145 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:* Versions before 10.0.14393.4825 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:* Versions before 10.0.14393.4825 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:* Versions before 10.0.17763.2366 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:* Versions before 10.0.18363.1977 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:* Versions before 10.0.19041.1415 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:arm64:* Versions before 10.0.19042.1415 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:x86:* Versions before 10.0.19042.1415 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:* Versions before 10.0.19043.1415 Vulnerable ·Microsoft
Show 15 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:* | before 10.0.19044.1415 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_11_21h2:*:*:*:*:*:*:*:* | before 10.0.22000.376 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:* | before 10.0.19041.1415 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x64:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x86:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* | r2 sp1 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* | r2 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* | before 10.0.14393.4825 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* | before 10.0.17763.2366 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* | before 10.0.20348.405 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:* | before 10.0.19042.1415 | Vulnerable | Microsoft |
- cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:* Versions before 10.0.19044.1415 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_11_21h2:*:*:*:*:*:*:*:* Versions before 10.0.22000.376 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:* Versions before 10.0.19041.1415 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x64:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x86:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* Versions r2 sp1 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* Versions r2 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* Versions before 10.0.14393.4825 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* Versions before 10.0.17763.2366 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* Versions before 10.0.20348.405 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:* Versions before 10.0.19042.1415 Vulnerable ·Microsoft
Remediation
- Fix · CNA Windows 10 Version 1809 (Microsoft) Fixed in 10.0.17763.2366
- Fix · CNA Windows Server 2019 (Microsoft) Fixed in 10.0.17763.2366
- Fix · CNA Windows Server 2019 (Server Core installation) (Microsoft) Fixed in 10.0.17763.2366
- Fix · CNA Windows 10 Version 1909 (Microsoft) Fixed in 10.0.18363.1977
- Fix · CNA Windows 10 Version 21H1 (Microsoft) Fixed in 10.0.19043.1415
- Fix · CNA Windows Server 2022 (Microsoft) Fixed in 10.0.20348.405
- Fix · CNA Windows 10 Version 2004 (Microsoft) Fixed in 10.0.19041.1415
- Fix · CNA Windows Server version 2004 (Microsoft) Fixed in 10.0.19041.1415
- Fix · CNA Windows 10 Version 20H2 (Microsoft) Fixed in 10.0.19042.1415
- Fix · CNA Windows Server version 20H2 (Microsoft) Fixed in 10.0.19042.1415
- Fix · CNA Windows 11 version 21H2 (Microsoft) Fixed in 10.0.22000.376
- Fix · CNA Windows 10 Version 21H2 (Microsoft) Fixed in 10.0.19044.1415
- Fix · CNA Windows 10 Version 1507 (Microsoft) Fixed in 10.0.10240.19145
- Fix · CNA Windows 10 Version 1607 (Microsoft) Fixed in 10.0.14393.4825
- Fix · CNA Windows Server 2016 (Microsoft) Fixed in 10.0.14393.4825
- Fix · CNA Windows Server 2016 (Server Core installation) (Microsoft) Fixed in 10.0.14393.4825
- Fix · CNA Windows 7 (Microsoft) Fixed in 6.1.7601.25796
- Fix · CNA Windows 7 Service Pack 1 (Microsoft) Fixed in 6.1.7601.25796
- Fix · CNA Windows 8.1 (Microsoft) Fixed in 6.3.9600.20207
- Fix · CNA Windows Server 2008 Service Pack 2 (Microsoft) Fixed in 6.0.6003.21309
- Fix · CNA Windows Server 2008 Service Pack 2 (Server Core installation) (Microsoft) Fixed in 6.0.6003.21309
- Fix · CNA Windows Server 2008 Service Pack 2 (Microsoft) Fixed in 6.0.6003.21309
- Fix · CNA Windows Server 2008 R2 Service Pack 1 (Microsoft) Fixed in 6.1.7601.25796
- Fix · CNA Windows Server 2008 R2 Service Pack 1 (Server Core installation) (Microsoft) Fixed in 6.1.7601.25796
- Fix · CNA Windows Server 2012 (Microsoft) Fixed in 6.2.9200.23545, 6.2.9200.23540
- Fix · CNA Windows Server 2012 (Server Core installation) (Microsoft) Fixed in 6.2.9200.23545, 6.2.9200.23540
- Fix · CNA Windows Server 2012 R2 (Microsoft) Fixed in 6.3.9600.20207
- Fix · CNA Windows Server 2012 R2 (Server Core installation) (Microsoft) Fixed in 6.3.9600.20207
Timeline
- 2025-10-06 Added to CISA KEV
- 2026-10-02 Threatist record created from CVE-2021-43226
- 2026-10-03 Alias added: GHSA-98jh-5xvm-p5ph
More Microsoft Windows 10 1507 vulnerabilities
- TI-2017-06077 Microsoft Windows XP SP3, Windows XP x64 XP2, Windows Server 2003 SP2, Windows Vista… KEVCVSS 3.1CRITICAL 9.8
- TI-2025-24062 Windows SMB Client Elevation of Privilege Vulnerability KEVCVSS 3.1HIGH 8.8
- TI-2025-24042 Internet Shortcut Files Remote Code Execution Vulnerability KEVCVSS 3.1HIGH 8.8
- TI-2024-32708 Windows Task Scheduler Elevation of Privilege Vulnerability KEVCVSS 3.1HIGH 8.8
- TI-2024-29106 Windows MSHTML Platform Spoofing Vulnerability KEVCVSS 3.1HIGH 8.8
- TI-2024-19802 Windows MSHTML Platform Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2021-43226 · CVE Program
- CVE-2021-43226 · NVD
- CISA Known Exploited Vulnerabilities
- FIRST EPSS
- GHSA-98jh-5xvm-p5ph · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences