CVE-2021-33739 (GCVE-0-2021-33739)

Vulnerability from cvelistv5 – Published: 2021-06-08 22:46 – Updated: 2025-10-21 23:25
VLAI CISA KEV KEVintel KEV
Title
Microsoft DWM Core Library Elevation of Privilege Vulnerability
Summary
Microsoft DWM Core Library Elevation of Privilege Vulnerability
Severity
8.4 (High)
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
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Microsoft Windows 10 Version 1909 Affected: 10.0.0 , < 10.0.18363.1621 (custom)
    cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1621:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1621:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_10_1809:10.0.18363.1621:*:*:*:*:*:x64:*
 Create a notification for this product.
Microsoft Windows 10 Version 21H1 Affected: 10.0.0 , < 10.0.19043.1052 (custom)
    cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1052:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1052:*:*:*:*:*:arm64:*
    cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1052:*:*:*:*:*:x86:*
 Create a notification for this product.
Microsoft Windows 10 Version 2004 Affected: 10.0.0 , < 10.0.19041.1052 (custom)
    cpe:2.3:o:microsoft:windows_10_1809:10.0.19041.1052:*:*:*:*:*:x64:*
 Create a notification for this product.
Microsoft Windows Server version 2004 Affected: 10.0.0 , < 10.0.19041.1052 (custom)
    cpe:2.3:o:microsoft:windows_server_2004:10.0.19041.1052:*:*:*:*:*:*:*
 Create a notification for this product.
Microsoft Windows 10 Version 20H2 Affected: 10.0.0 , < 10.0.19042.1052 (custom)
    cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1052:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1052:*:*:*:*:*:arm64:*
 Create a notification for this product.
Microsoft Windows Server version 20H2 Affected: 10.0.0 , < 10.0.19042.1052 (custom)
    cpe:2.3:o:microsoft:windows_server_20H2:10.0.19042.1052:*:*:*:*:*:*:*
 Create a notification for this product.
Date Public
2021-06-08 07:00
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b51aa925-7438-444b-b0f8-405aba260e3e

Vulnerability ID: CVE-2021-33739

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: Microsoft Desktop Window Manager (DWM) Core Library Privilege Escalation Vulnerability | Affected: Microsoft / Windows | Description: Microsoft Desktop Window Manager (DWM) Core Library contains an unspecified vulnerability that allows for privilege escalation. | Required action: Apply updates per vendor instructions. | Due date: 2021-11-17 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-33739
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes
Feed CISA Known Exploited Vulnerabilities Catalog
Product Windows
Due Date 2021-11-17
Date Added 2021-11-03
Vendorproject Microsoft
Vulnerabilityname Microsoft Desktop Window Manager (DWM) Core Library Privilege Escalation Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:28 UTC | Updated: 2026-02-06 07:17 UTC
KEVintel KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: fef7ad28-732c-4e33-b593-6f3359fab390

Vulnerability ID: CVE-2021-33739

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEVIntel entry: Microsoft DWM Core Library Elevation of Privilege Vulnerability | Affected: Microsoft / Windows 10 Version 1909, Windows 10 Version 21H1, Windows 10 Version 2004, Windows Server version 2004, Windows 10 Version 20H2, Windows Server version 20H2 | CVSS: 8.4 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Microsoft DWM Core Library Elevation of Privilege Vulnerability
Vendor Microsoft
Product Windows 10 Version 1909, Windows 10 Version 21H1, Windows 10 Version 2004, Windows Server version 2004, Windows 10 Version 20H2, Windows Server version 20H2
Added Date 2021-11-03T00:00:00.000Z
Cvss Score 8.4
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-19 12:47 UTC | Updated: 2026-06-19 12:47 UTC
Show details on NVD website
To clipboard 

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      "cveMetadata": "{\"cveId\": \"CVE-2021-33739\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-21T23:25:43.048Z\", \"dateReserved\": \"2021-05-28T00:00:00.000Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2021-06-08T22:46:43.000Z\", \"assignerShortName\": \"microsoft\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.