CVE-2021-1732

Confirmed PUBLISHED

Windows Win32k Elevation of Privilege Vulnerability

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

Exploited in the wild Used in malware PoC available

Recommended Action

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

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Confidence

Confirmed

Exploitation Status

Exploited in the wild

Observed in Sensors

Attempts (30d)

—

Unique Attacker IPs

—

CISA KEV

In CISA KEV

CVSS / EPSS

7.8 High EPSS 78.4%

At a Glance

Windows Win32k Elevation of Privilege Vulnerability

microsoft malware windows ransomware metasploit cisa

CVE Published: Feb 25, 2021
Exploitation Reported: Nov 03, 2021
CVSS: 7.8 High
EPSS: 78.4%

Low complexity No user interaction

Affected Versions

Vendor	Product	Version	Status
Microsoft	Windows 10 Version 1803	10.0.0 to < publication	Affected
Microsoft	Windows 10 Version 1809	10.0.0 to < publication	Affected
Microsoft	Windows Server 2019	10.0.0 to < publication	Affected
Microsoft	Windows Server 2019 (Server Core installation)	10.0.0 to < publication	Affected
Microsoft	Windows 10 Version 1909	10.0.0 to < publication	Affected
Microsoft	Windows Server, version 1909 (Server Core installation)	10.0.0 to < publication	Affected
Microsoft	Windows 10 Version 2004	10.0.0 to < publication	Affected
Microsoft	Windows Server version 2004	10.0.0 to < publication	Affected
Microsoft	Windows 10 Version 20H2	10.0.0 to < publication	Affected
Microsoft	Windows Server version 20H2	10.0.0 to < publication	Affected

CVE References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1732 portal.msrc.microsoft.com · CVE Record https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CV...
packetstormsecurity.com/files/161880/Win32k-ConsoleControl-Offset-Co... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/161880/Win32k-ConsoleControl-Off...
packetstormsecurity.com/files/166169/Win32k-ConsoleControl-Offset-Co... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/166169/Win32k-ConsoleControl-Off...

Recommended Actions

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.

Known Exploited Vulnerability Sources

Catalogues that list this CVE as a known exploited vulnerability.

Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.

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Source	Added
CISA First	2021-11-03 00:00 UTC
Tenable Blog	2026-06-02 14:20 UTC

Scanner Artifacts

Nuclei and Metasploit references linked to this CVE.

Scanner	Reference	Detected
Metasploit	https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/local/cve_2022_21882_win32k.rb	Apr 28, 2025

CVSS Scores

CVSS v3.1 7.8 High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 4.6 Medium

AV:L/AC:L/Au:N/C:P/I:P/A:P

Exploitation Status

Exploited in the wild

Recorded 2021-11-03 00:00:00 UTC · CISA

Used in malware

Recorded 2021-11-03 00:00:00 UTC · CISA

Proof of concept available

Recorded 2021-03-05 02:11:10 UTC · GitHub

Weaknesses (CWE)

CWE-787

Out-of-bounds Write

Scanner Integrations

Scanner	Reference	Detected
Metasploit	https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/local/cve_2022_21882_win32k.rb	Apr 28, 2025

Recent Mentions

Inside the customer environment: Where threat actors, vulnerabilities, and exposed assets intersect

Tenable Blog · May 27, 2026

Tenable Research has developed a graph-based model linking 600+ threat groups to real-world customer exposures. It reveals which vulnerabilities sit at the intersection of severity, active exploitation, and organizational risk.Key takeawaysThe "patch everything" strategy is dead: Vulnerability prioritization based on exploitation risk offers a path forward. A directed graph model linking 600+ threat actors to vulnerabilities in 7,800 customer environments reveals that 68% of organizations carry at least one CVE previously exploited by a named adversary, and 321 tracked threat groups can reach at least one customer environment through an active vulnerability. Prevalence of "Elite Arsenal" CVEs requires immediate attention: The 242 "Elite Arsenal" CVEs — those meeting all three criteria of critical VPR (≥ 9), CISA KEV listing, and documented threat group exploitation — are nearly universally present across the studied customer base, with 241 of 242 actively detected. More than half are five or more years old, and 78% of the persistently exploited core are simultaneously weaponized by nation-state APTs, commodity malware operators, and ransomware gangs. Non-CVE exposures are universally dangerous: Non-CVE exposures, including misconfigurations, weak credentials, and end-of-life software, are present in virtually 100% of studied organizations, with 60% carrying at least one that maps to a tracked threat actor's preferred techniques. Preliminary modeling suggests these exposures may confer more breach risk than CVE-linked findings, yet no industry-standard scoring infrastructure exists to prioritize them.While the first two posts in this blog series documented the accelerating vulnerability flood and the widening remediation gap, today we answer the outstanding question: Where do these forces actually collide inside customer environments? Using a directed graph model that maps more than 600 tracked threat groups to vulnerabilities observed across 7,800 organizations,...

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

yangshifan-git/CVE-2021-1732

github · Created 2023-06-29 12:23:51 UTC · 0 stars

4dp/CVE-2021-1732

github · Created 2023-03-09 07:14:45 UTC · 3 stars

CVE-2021-1732 Microsoft Windows 10 本地提权漏研究及Poc/Exploit开发

fenalik/CVE-2021-1732

github · Created 2022-11-01 13:06:17 UTC · 14 stars

CVE-2021-1732 Microsoft Windows 10 本地提权漏研究及Poc/Exploit开发

exploitblizzard/Windows-Privilege-Escalation-CVE-2021-1732

github · Created 2021-04-25 12:55:15 UTC · 31 stars

Read my blog for more info -

Pai-Po/CVE-2021-1732

github · Created 2021-04-23 08:21:54 UTC · 67 stars

CVE-2021-1732 poc & exp; tested on 20H2

linuxdy/CVE-2021-1732_exp

github · Created 2021-04-02 01:35:41 UTC · 2 stars

oneoy/CVE-2021-1732-Exploit

github · Created 2021-03-09 02:13:43 UTC · 0 stars

k-k-k-k-k/CVE-2021-1732

github · Created 2021-03-08 05:07:15 UTC · 81 stars

CVE-2021-1732 Microsoft Windows 10 本地提权漏研究及Poc/Exploit开发

KaLendsi/CVE-2021-1732-Exploit

github · Created 2021-03-05 02:11:10 UTC · 417 stars

CVE-2021-1732 Exploit

Automate This Intelligence with the Pro API

Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Pro API Example

GET /api/v2/pro/kevs/CVE-2021-1732

{
  "cve_id": "CVE-2021-1732",
  "title": "Windows Win32k Elevation of Privilege Vulnerability",
  "affected_vendor": "Microsoft",
  "affected_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",
  "affected_versions": [
    { "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
  ],
  "confidence": "Confirmed",
  "cvss_score": 7.8,
  "epss_score": 0.78376,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "...": "Pro API fields" },
  "proof_of_concepts": [ "..." ],
  "scanner_integrations": [ "..." ]
}

The free JSON API returns basic KEV fields only. Confidence, telemetry, and artifact enrichment require Pro API access.

CVE-2021-1732

At a Glance

Affected Versions

CVE References

Recommended Actions

Known Exploited Vulnerability Sources

Scanner Artifacts

Virtual Patch

CVSS Scores

Exploitation Status

Weaknesses (CWE)

Scanner Integrations

Recent Mentions

Potential Proof of Concepts

Timeline

Automate This Intelligence with the Pro API