Win32k Elevation of Privilege Vulnerability
Priority CRITICAL 93Exploited in the wildCWE-787Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
Win32k Elevation of Privilege Vulnerability
Why it matters now
Exploitation Active In CISA KEV since 2021-11-03CISA due date 2021-11-17
EPSS 0.08398 95th percentileScored 2026-11-07
Fix Fixed Windows 10 Version 1803 (Microsoft): publicationWindows 10 Version 1809 (Microsoft): publication+8 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 1803 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1809 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2019 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1909 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server, version 1909 (Server Core installation) | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 2004 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server version 2004 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 20H2 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server version 20H2 | 10.0.0 to before publication | publication | Patch available | CNA |
- Windows 10 Version 1803 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1809 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2019 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2019 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1909 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server, version 1909 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 2004 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server version 2004 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 20H2 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server version 20H2 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
CPE configurations NVD · 9
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10_2004:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10_20h2:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_1909:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2004:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_20h2:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
- cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10_2004:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10_20h2:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_1909:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2004:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_20h2:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
Remediation
- Fix · CNA Windows 10 Version 1803 (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1809 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2019 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2019 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1909 (Microsoft) Fixed in publication
- Fix · CNA Windows Server, version 1909 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 2004 (Microsoft) Fixed in publication
- Fix · CNA Windows Server version 2004 (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 20H2 (Microsoft) Fixed in publication
- Fix · CNA Windows Server version 20H2 (Microsoft) Fixed in publication
Timeline
- 2021-11-03 Added to CISA KEV
- 2026-10-02 Threatist record created from CVE-2021-28310
- 2026-10-03 Alias added: GHSA-8mmc-r5c6-h963
- 2026-11-05 EPSS moved to the 95th–99th percentile
More Microsoft Windows 10 1803 vulnerabilities
- TI-2020-00989 Out-of-bounds write in Microsoft Windows KEVCVSS 3.1HIGH 8.8
- TI-2019-00654 A remote code execution vulnerability exists in the way that the Windows Graphics Device… KEVCVSS 3.1HIGH 8.8
- TI-2018-06097 Improper input validation in Microsoft Windows 10 Servers KEVCVSS 3.1HIGH 8.8
- TI-2018-00765 A remote code execution vulnerability exists in "Microsoft COM for Windows" when it fails… KEVCVSS 3.1HIGH 8.8
- TI-2018-06276 An elevation of privilege vulnerability exists in Windows when the Win32k component fails… KEVCVSS 3.1HIGH 8.4
- TI-2020-00578 Improper certificate validation in Microsoft Windows KEVCVSS 3.1HIGH 8.1
Sources
- CVE-2021-28310 · CVE Program
- CVE-2021-28310 · NVD
- CISA Known Exploited Vulnerabilities
- FIRST EPSS
- GHSA-8mmc-r5c6-h963 · 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