CVE-2021-34516 — Win32k Elevation of Privilege Vulnerability

Executive Summary

None

Overview

7.8

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Elevation of Privilege

Released Jul 13 2021

Last Updated Jul 13 2021

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

NVD CVSS 7.8 HIGH — matches MSRC

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

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 6.8

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

53 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1809 for 32-bit Systems	`5004244 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 1809 for x64-based Systems	`5004244 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 1809 for ARM64-based Systems	`5004244 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server 2019	`5004244 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server 2019 (Server Core installation)	`5004244 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 1909 for 32-bit Systems	`5004245 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 1909 for x64-based Systems	`5004245 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 1909 for ARM64-based Systems	`5004245 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 21H1 for x64-based Systems	`5004237 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 21H1 for ARM64-based Systems	`5004237 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 21H1 for 32-bit Systems	`5004237 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 2004 for 32-bit Systems	`5004237 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 2004 for ARM64-based Systems	`5004237 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 2004 for x64-based Systems	`5004237 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server, version 2004 (Server Core installation)	`5004237 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 20H2 for 32-bit Systems	`5004237 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 20H2 for ARM64-based Systems	`5004237 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server, version 20H2 (Server Core Installation)	`5004237 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 for 32-bit Systems	`5004249 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 for x64-based Systems	`5004249 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 1607 for 32-bit Systems	`5004238 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 10 Version 1607 for x64-based Systems	`5004238 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server 2016	`5004238 (Security Update)`	Important	Elevation of Privilege	Yes
Windows Server 2016 (Server Core installation)	`5004238 (Security Update)`	Important	Elevation of Privilege	Yes
Windows 7 for 32-bit Systems Service Pack 1	`5004289 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows 7 for x64-based Systems Service Pack 1	`5004289 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows Server 2008 R2 for x64-based Systems Service Pack 1	`5004289 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)	`5004289 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows 7 for 32-bit Systems Service Pack 1	`5004307 (Security Only)`	Important	Elevation of Privilege	Yes
Windows 7 for x64-based Systems Service Pack 1	`5004307 (Security Only)`	Important	Elevation of Privilege	Yes
Windows Server 2008 R2 for x64-based Systems Service Pack 1	`5004307 (Security Only)`	Important	Elevation of Privilege	Yes
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)	`5004307 (Security Only)`	Important	Elevation of Privilege	Yes
Windows 8.1 for 32-bit systems	`5004298 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows 8.1 for x64-based systems	`5004298 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows Server 2012 R2	`5004298 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows Server 2012 R2 (Server Core installation)	`5004298 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows 8.1 for 32-bit systems	`5004285 (Security Only)`	Important	Elevation of Privilege	Yes
Windows 8.1 for x64-based systems	`5004285 (Security Only)`	Important	Elevation of Privilege	Yes
Windows Server 2012 R2	`5004285 (Security Only)`	Important	Elevation of Privilege	Yes
Windows Server 2012 R2 (Server Core installation)	`5004285 (Security Only)`	Important	Elevation of Privilege	Yes
Windows RT 8.1	`5004298 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows Server 2008 for 32-bit Systems Service Pack 2	`5004305 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)	`5004305 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows Server 2008 for x64-based Systems Service Pack 2	`5004305 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)	`5004305 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows Server 2008 for 32-bit Systems Service Pack 2	`5004299 (Security Only)`	Important	Elevation of Privilege	Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)	`5004299 (Security Only)`	Important	Elevation of Privilege	Yes
Windows Server 2008 for x64-based Systems Service Pack 2	`5004299 (Security Only)`	Important	Elevation of Privilege	Yes
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)	`5004299 (Security Only)`	Important	Elevation of Privilege	Yes
Windows Server 2012	`5004294 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows Server 2012 (Server Core installation)	`5004294 (Monthly Rollup)`	Important	Elevation of Privilege	Yes
Windows Server 2012	`5004302 (Security Only)`	Important	Elevation of Privilege	Yes
Windows Server 2012 (Server Core installation)	`5004302 (Security Only)`	Important	Elevation of Privilege	Yes

Patches

13 patches

Article	Type	Restart
`5004244`	Security Update	Yes
`5004245`	Security Update	Yes
`5004237`	Security Update	Yes
`5004249`	Security Update	Yes
`5004238`	Security Update	Yes
`5004289`	Monthly Rollup	Yes
`5004307`	Security Only	Yes
`5004298`	Monthly Rollup	Yes
`5004285`	Security Only	Yes
`5004305`	Monthly Rollup	Yes
`5004299`	Security Only	Yes
`5004294`	Monthly Rollup	Yes
`5004302`	Security Only	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Marcin Wiazowski working with Trend Micro Zero Day Initiative

References

MSRC Advisory MITRE NVD