CVE-2021-41357
Win32k Elevation of Privilege Vulnerability
- High 7.8
- Exploited: added to CISA KEV 25 Apr 2022
Description
Win32k Elevation of Privilege Vulnerability
Key facts
- Published
- 13 Oct 2021
- Last changed
- 21 Oct 2025
- Assigned by
- microsoft
- KEV added
- 25 Apr 2022
- KEV fix due
- 16 May 2022
- EPSS
- 1.523% likely to be exploited in the next 30 days, higher than 75.042% 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 21H1 |
|
| Microsoft | Windows Server 2022 |
|
| Microsoft | Windows 10 Version 2004 |
|
| Microsoft | Windows Server version 2004 |
|
| Microsoft | Windows 10 Version 20H2 |
|
| Microsoft | Windows Server version 20H2 |
|
| Microsoft | Windows 11 version 21H2 |
|
Timeline
- 13 Oct 2021 Published
- 25 Apr 2022 CVE-2021-41357 added to CISA KEV
- 25 Apr 2022 Added to the CISA KEV catalogue