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CVE-2018-8639

Severity
HIGH
CVSS
8.4
EPSS
0.22349
Risk score
66.42
CISA KEV
Yes
PoC
No
Published
2018-12-12
Modified
2025-10-21
First seen
2026-08-07
Aliases
EUVD-2018-20250, GHSA-93MM-G479-2CX4
Products
Microsoft:Windows, Microsoft:Windows 10 32-bit Systems, Microsoft:Windows 10 Servers version 1709 (Server Core Installation), Microsoft:Windows 10 Servers version 1803 (Server Core Installation), Microsoft:Windows 10 Version 1607 for 32-bit Systems, Microsoft:Windows 10 Version 1607 for x64-based Systems, Microsoft:Windows 10 Version 1703 for 32-bit Systems, Microsoft:Windows 10 Version 1703 for x64-based Systems, Microsoft:Windows 10 Version 1709 for 32-bit Systems, Microsoft:Windows 10 Version 1709 for ARM64-based Systems, Microsoft:Windows 10 Version 1709 for x64-based Systems, Microsoft:Windows 10 Version 1803 for 32-bit Systems, Microsoft:Windows 10 Version 1803 for ARM64-based Systems, Microsoft:Windows 10 Version 1803 for x64-based Systems, Microsoft:Windows 10 Version 1809 for 32-bit Systems, Microsoft:Windows 10 Version 1809 for ARM64-based Systems, Microsoft:Windows 10 Version 1809 for x64-based Systems, Microsoft:Windows 10 x64-based Systems, Microsoft:Windows 7 32-bit Systems Service Pack 1, Microsoft:Windows 7 x64-based Systems Service Pack 1, Microsoft:Windows 8.1 32-bit systems, Microsoft:Windows 8.1 x64-based systems, Microsoft:Windows RT 8.1 Windows RT 8.1, Microsoft:Windows Server 2008 32-bit Systems Service Pack 2, Microsoft:Windows Server 2008 32-bit Systems Service Pack 2 (Server Core installation), Microsoft:Windows Server 2008 Itanium-Based Systems Service Pack 2, Microsoft:Windows Server 2008 R2 Itanium-Based Systems Service Pack 1, Microsoft:Windows Server 2008 R2 x64-based Systems Service Pack 1, Microsoft:Windows Server 2008 R2 x64-based Systems Service Pack 1 (Server Core installation), Microsoft:Windows Server 2008 x64-based Systems Service Pack 2, Microsoft:Windows Server 2008 x64-based Systems Service Pack 2 (Server Core installation), Microsoft:Windows Server 2012 (Server Core installation), Microsoft:Windows Server 2012 R2 (Server Core installation), Microsoft:Windows Server 2016 (Server Core installation), Microsoft:Windows Server 2019 (Server Core installation)
Sources
cisa.gov CVE-2018-8639
euvd EUVD-2018-20250

Description

An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka "Win32k Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2019, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers. This CVE ID is unique from CVE-2018-8641.

References