CVE-2023-21756

CVEs › CVE-2023-21756

Description

Windows Win32k Elevation of Privilege Vulnerability

Overview

State: PUBLISHED
Assigner (CNA): microsoft
CVSS severity: HIGH
CVSS score: 7.8 / 10
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Effective score: 7.8 / 10 HIGH source: CNA overview
MSRC score: 7.8 / 10 HIGH MS rating: Important · Elevation of Privilege
CWE(s): CWE-416
Reserved: 2022-12-13
Published: 2023-07-11 07:00 UTC
Last updated: 2023-07-11 07:00 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2023/21xxx/CVE-2023-21756.json
Linked Threat: CVE-2023-21756 — Windows Win32k Elevation of Privilege Vulnerability

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2023-25923
Assigner: microsoft
Published: Jul 11, 2023, 5:02:15 PM
Updated: Jan 1, 2025, 1:51:50 AM
EUVD base score (CVSS 3.1): 7.8 / 10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
EUVD-reported EPSS: 0.1300
Vendors: Microsoft
Products: Windows Server 2012 (6.2.9200.0 <6.2.9200.24374)

Windows 11 version 21H2 (10.0.0 <10.0.22000.2176)

Windows 10 Version 1809 (10.0.0 <10.0.17763.4645)

Windows Server 2019 (10.0.17763.0 <10.0.17763.4645)

Windows Server 2012 R2 (6.3.9600.0 <6.3.9600.21063)

Windows Server 2012 R2 (Server Core installation) (6.3.9600.0 <6.3.9600.21063)

Windows 10 Version 1507 (10.0.10240.0 <10.0.10240.20048)

Windows Server 2022 (10.0.20348.0 <10.0.20348.1850)

Windows Server 2019 (Server Core installation) (10.0.17763.0 <10.0.17763.4645)

Windows 10 Version 22H2 (10.0.19045.0 <10.0.19045.3208)

Windows Server 2016 (10.0.14393.0 <10.0.14393.6085)

Windows 10 Version 1809 (10.0.17763.0 <10.0.17763.4645)

Windows 10 Version 1607 (10.0.14393.0 <10.0.14393.6085)

Windows Server 2012 (Server Core installation) (6.2.9200.0 <6.2.9200.24374)

Windows 11 version 22H2 (10.0.22621.0 <10.0.22621.1992)

Windows 10 Version 21H2 (10.0.19043.0 <10.0.19044.3208)

Windows Server 2016 (Server Core installation) (10.0.14393.0 <10.0.14393.6085)
Aliases: GHSA-r586-f2rp-fgr6

ENISA description: Windows Win32k Elevation of Privilege Vulnerability

EUVD references (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21756

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-08-11 01:48 UTC (source: CVRF).

MS severity: Important
Impact: Elevation of Privilege
MS CVSS base score: 7.8 / 10 (temporal 6.8)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Exploit assessment: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely;Older Software Release:Exploitation Less Likely;DOS:N/A
Release: 2023-Jul

Microsoft remediations / KB articles (16)

5028168 — Vendor Fix / Security Update (fixed build 10.0.17763.4645)
5028168 — Update
5028171 — Vendor Fix / Security Update (fixed build 10.0.20348.1850)
5028171 — Update
5028182 — Vendor Fix / Security Update (fixed build 10.0.22000.2176)
5028182 — Update
5028166 — Vendor Fix / Security Update (fixed build 10.0.19044.3208)
5028166 — Update
5028185 — Vendor Fix / Security Update (fixed build 10.0.22621.1992)
5028185 — Update
5028186 — Vendor Fix / Security Update (fixed build 10.0.10240.20048)
5028169 — Vendor Fix / Security Update (fixed build 10.0.14393.6085)
5028232 — Vendor Fix / Monthly Rollup (fixed build 6.2.9200.24374)
5028233 — Vendor Fix / Security Only (fixed build 6.2.9200.24374)
5028228 — Vendor Fix / Monthly Rollup (fixed build 6.3.9600.21063)
5028223 — Vendor Fix / Security Only (fixed build 6.3.9600.21075)

Microsoft FAQ (1)

What privileges could be gained by an attacker who successfully exploited this vulnerability?

An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

Affected products (17)

Vendor	Product	Versions	Platforms
Microsoft	Windows 10 Version 1809	`10.0.17763.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows 10 Version 1809	`10.0.0` (affected)	ARM64-based Systems
Microsoft	Windows Server 2019	`10.0.17763.0` (affected)	x64-based Systems
Microsoft	Windows Server 2019 (Server Core installation)	`10.0.17763.0` (affected)	x64-based Systems
Microsoft	Windows Server 2022	`10.0.20348.0` (affected)	x64-based Systems
Microsoft	Windows 11 version 21H2	`10.0.0` (affected)	x64-based Systems, ARM64-based Systems
Microsoft	Windows 10 Version 21H2	`10.0.19043.0` (affected)	32-bit Systems, ARM64-based Systems, x64-based Systems
Microsoft	Windows 11 version 22H2	`10.0.22621.0` (affected)	ARM64-based Systems, x64-based Systems
Microsoft	Windows 10 Version 22H2	`10.0.19045.0` (affected)	x64-based Systems, ARM64-based Systems, 32-bit Systems
Microsoft	Windows 10 Version 1507	`10.0.10240.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows 10 Version 1607	`10.0.14393.0` (affected)	32-bit Systems, x64-based Systems
Microsoft	Windows Server 2016	`10.0.14393.0` (affected)	x64-based Systems
Microsoft	Windows Server 2016 (Server Core installation)	`10.0.14393.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012	`6.2.9200.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 (Server Core installation)	`6.2.9200.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 R2	`6.3.9600.0` (affected)	x64-based Systems
Microsoft	Windows Server 2012 R2 (Server Core installation)	`6.3.9600.0` (affected)	x64-based Systems

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

Windows Win32k Elevation of Privilege Vulnerability vendor-advisory

Web references (17)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

5028166 msrc
5028168 msrc
5028169 msrc
5028171 msrc
5028182 msrc
5028185 msrc
5028186 msrc
5028223 msrc
5028228 msrc
5028232 msrc
5028233 msrc
MSRC update guide: CVE-2023-21756 msrc
5028166 msrc
5028168 msrc
5028171 msrc
5028182 msrc
5028185 msrc

Remediations (15)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Critical Patch Updates, Critical Security Patch Updates ... - Oracle

web:www.oracle.com

Critical Security Patch Updates Critical Security Patch Updates provide security patches for supported Oracle on-premises products. A Critical Security Patch Update provides targeted, high-priority security fixes in a smaller, more focused format, making them easier to apply with minimal disruption.

2026-06-04 09:44 UTC
NVD - Home

web:nvd.nist.gov

The NVD is the U.S. government repository of standards based vulnerability management data represented using the Security Content Automation Protocol (SCAP). This data enables automation of vulnerability management, security measurement, and compliance. The NVD includes databases of security checklist references, security-related software flaws, product names, and impact metrics. For ...

2026-06-04 09:44 UTC
Patch Tuesday - March 2026 - Rapid7

web:www.rapid7.com

Microsoft is publishing 77 vulnerabilities this Patch Tuesday, including two publicly disclosed zero-day vulnerabilities.

2026-06-04 09:44 UTC
‎Google Gemini

web:gemini.google.com

Meet Gemini, Google's AI assistant. Get help with writing, planning, brainstorming, and more. Experience the power of generative AI.

2026-06-04 09:44 UTC
Windows 11, version 23H2 known issues and notifications

web:learn.microsoft.com

As of November 11, 2025, Home and Pro editions of Windows 11, version 23H2 have reached end of servicing. Enterprise and Education editions of version 23H2 will continue to receive monthly security updates until November 10, 2026.

2026-06-04 09:44 UTC
Microsoft provides mitigation for "YellowKey" BitLocker bypass flaw ...

web:www.helpnetsecurity.com

Microsoft is working on a fix for CVE -2026-45585 (aka "Yellowkey"), a vulnerability that can be used to bypass Windows' BitLocker protection.

2026-05-22 05:46 UTC
Microsoft Rushes Out Emergency Mitigation For 'YellowKey ... - LinkedIn

web:www.linkedin.com

Microsoft Security Response Center has issued an emergency mitigation for a newly disclosed BitLocker bypass vulnerability known as "YellowKey," after security researchers publicly released ...

2026-05-22 05:46 UTC
Oracle Critical Patch Update Advisory - April 2026

web:www.oracle.com

This Critical Patch Update contains 481 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at April 2026 Critical Patch Update: Executive Summary and Analysis.

2026-05-22 05:46 UTC
Microsoft Rolls Out Mitigations for 'YellowKey' BitLocker ...

web:www.securityweek.com

Microsoft has announced mitigations for CVE -2026-45585, a BitLocker bypass triggered via FsTx in Windows Recovery.

2026-05-22 05:46 UTC
Microsoft Releases Mitigation for Windows BitLocker Security Bypass 0 ...

web:cybersecuritynews.com

No patch has been released yet; Microsoft has instead issued a multi-step manual mitigation guide while a formal security update is prepared. Windows BitLocker Security Bypass The vulnerability originates in WinRE's handling of the BootExecute registry value under HKLM\ControlSet001\Control\Session Manager.

2026-05-22 05:46 UTC
I tested Windows 11 March 2026 Updates: Everything new ... - Windows Latest

web:www.windowslatest.com

Windows 11 March 2026 Patch Tuesday update adds Emoji 16.0, Sysmon, network speed test, reliability improvements, and security fixes.

2026-05-22 05:46 UTC
Patch Tuesday, May 2026 Edition - Krebs on Security

web:krebsonsecurity.com

Microsoft expects that exploitation is more likely. May's Patch Tuesday is a welcome respite from April, which saw Microsoft fix a near-record 167 security flaws.

2026-05-22 05:46 UTC
Security Update Guide - Loading - Microsoft

web:portal.msrc.microsoft.com

The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.

2026-05-22 05:46 UTC
Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws

web:www.bleepingcomputer.com

Today is Microsoft's March 2026 Patch Tuesday with security updates for 79 flaws, including 2 publicly disclosed zero-day vulnerabilities.

2026-05-22 05:46 UTC
CVE: Common Vulnerabilities and Exposures

web:www.cve.org

At cve .org, we provide the authoritative reference method for publicly known information-security vulnerabilities and exposures

2026-05-22 05:46 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2023-21756.json.

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        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
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