CVE-2021-33739
Microsoft DWM Core Library Elevation of Privilege Vulnerability
- High 8.4
- Exploited: added to CISA KEV 3 Nov 2021
Description
Microsoft DWM Core Library Elevation of Privilege Vulnerability
Key facts
- Published
- 8 Jun 2021
- Last changed
- 21 Oct 2025
- Assigned by
- microsoft
- KEV added
- 3 Nov 2021
- KEV fix due
- 17 Nov 2021
- EPSS
- 6.609% likely to be exploited in the next 30 days, higher than 93.957% 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.
- 8.4CVSS 3.1, Highfrom the CNA (microsoft)
CVSS:3.1/AV:L/AC:L/PR:N/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 1909 |
|
| Microsoft | Windows 10 Version 21H1 |
|
| Microsoft | Windows 10 Version 2004 |
|
| Microsoft | Windows Server version 2004 |
|
| Microsoft | Windows 10 Version 20H2 |
|
| Microsoft | Windows Server version 20H2 |
|
Timeline
- 8 Jun 2021 Published
- 3 Nov 2021 CVE-2021-33739 added to CISA KEV
- 3 Nov 2021 Added to the CISA KEV catalogue