CVE-2021-1732 (GCVE-0-2021-1732)
Vulnerability from cvelistv5 – Published: 2021-02-25 23:01 – Updated: 2026-08-12 03:55Title
Windows Win32k Elevation of Privilege Vulnerability
Summary
Windows Win32k Elevation of Privilege Vulnerability
Severity
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2021-02-04 00:00 UTC
CWE
- Elevation of Privilege
- CWE-787 - Out-of-bounds Write
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://portal.msrc.microsoft.com/en-US/security-… | x_refsource_MISC |
| http://packetstormsecurity.com/files/161880/Win32… | x_refsource_MISC |
| http://packetstormsecurity.com/files/166169/Win32… | x_refsource_MISC |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
10 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1803 |
Affected:
10.0.0 , < publication
(custom)
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_10_1803:*:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_10_1803:*:*:*:*:*:*:arm64:* |
||
| Microsoft | Windows 10 Version 1809 |
Affected:
10.0.0 , < publication
(custom)
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:arm64:* |
||
| Microsoft | Windows Server 2019 |
Affected:
10.0.0 , < publication
(custom)
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* |
||
| Microsoft | Windows Server 2019 (Server Core installation) |
Affected:
10.0.0 , < publication
(custom)
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* |
||
| Microsoft | Windows 10 Version 1909 |
Affected:
10.0.0 , < publication
(custom)
cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* |
||
| Microsoft | Windows Server, version 1909 (Server Core installation) |
Affected:
10.0.0 , < publication
(custom)
cpe:2.3:o:microsoft:windows_server_1909:*:*:*:*:*:*:*:* |
||
| Microsoft | Windows 10 Version 2004 |
Affected:
10.0.0 , < publication
(custom)
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* |
||
| Microsoft | Windows Server version 2004 |
Affected:
10.0.0 , < publication
(custom)
cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:* |
||
| Microsoft | Windows 10 Version 20H2 |
Affected:
10.0.0 , < publication
(custom)
cpe:2.3:o:microsoft:windows_10_20H2:*:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_20H2:*:*:*:*:*:*:arm64:* |
||
| Microsoft | Windows Server version 20H2 |
Affected:
10.0.0 , < publication
(custom)
cpe:2.3:o:microsoft:windows_server_20H2:*:*:*:*:*:*:*:* |
Date Public
2021-02-09 08:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: a57b872c-aea7-4dc5-b9c6-f7a429b8887b
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: Microsoft Win32k Privilege Escalation Vulnerability | Affected: Microsoft / Win32k | Description: Microsoft Win32k 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): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-1732
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-787 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Win32k |
| Due Date | 2021-11-17 |
| Date Added | 2021-11-03 |
| Vendorproject | Microsoft |
| Vulnerabilityname | Microsoft Win32k Privilege Escalation Vulnerability |
| Knownransomwarecampaignuse | Known |
References
Created: 2026-02-02 12:28 UTC
| Updated: 2026-02-06 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 1be30167-a6bb-4d2a-8d2a-03efa2f8587f
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEVIntel entry: Windows Win32k Elevation of Privilege Vulnerability | Affected: Microsoft / Windows 10 Version 1803, Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows 10 Version 1909, Windows Server, version 1909 (Server Core installation), Windows 10 Version 2004, Windows Server version 2004, Windows 10 Version 20H2, Windows Server version 20H2 | CVSS: 7.8 (HIGH) | EPSS: 0.78376 | Used in malware: yes | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Confirmed Compromise
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Windows Win32k Elevation of Privilege Vulnerability |
| Vendor | Microsoft |
| Product | Windows 10 Version 1803, Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows 10 Version 1909, Windows Server, version 1909 (Server Core installation), 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 | 7.8 |
| Epss Score | 0.78376 |
| Cvss Severity | HIGH |
| Epss Percentile | 0.99526 |
| Used In Malware | yes |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 14:04 UTC
| Updated: 2026-07-10 06:14 UTC
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"cve": "CVE-2021-1732",
"id": "CVE-2021-1732",
"initial_release_date": "2021-02-09T08:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "Windows Win32k Elevation of Privilege Vulnerability",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-1732.json",
"version": "3"
},
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"dataType": "CVE_RECORD",
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}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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