CVE-2021-28310
Win32k Elevation of Privilege Vulnerability
- High 7.8
- Exploited: added to CISA KEV 3 Nov 2021
Description
Win32k Elevation of Privilege Vulnerability
Key facts
- Published
- 13 Apr 2021
- Last changed
- 21 Oct 2025
- Assigned by
- microsoft
- KEV added
- 3 Nov 2021
- KEV fix due
- 17 Nov 2021
- EPSS
- 8.398% likely to be exploited in the next 30 days, higher than 95.071% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 7.8CVSS 3.1, Highfrom the CNA (microsoft)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1803 |
|
| Microsoft | Windows 10 Version 1809 |
|
| Microsoft | Windows Server 2019 |
|
| Microsoft | Windows Server 2019 (Server Core installation) |
|
| Microsoft | Windows 10 Version 1909 |
|
| Microsoft | Windows Server, version 1909 (Server Core installation) |
|
| Microsoft | Windows 10 Version 2004 |
|
| Microsoft | Windows Server version 2004 |
|
| Microsoft | Windows 10 Version 20H2 |
|
| Microsoft | Windows Server version 20H2 |
|
Timeline
- 13 Apr 2021 Published
- 3 Nov 2021 CVE-2021-28310 added to CISA KEV
- 3 Nov 2021 Added to the CISA KEV catalogue