An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory, aka…

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.

Scores

EPSS (exploitation in 30 days)

22.3% · top 2.3% of all CVEs (4 Nov 2026)

CISA SSVC

Exploitation: active · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.

Weakness

• Elevation of Privilege
• Information Disclosure
• CWE-404 Improper Resource Shutdown or Release (opens in a new tab)All about CWE-404 and its CVEs

Affected products

• Microsoft · Windows 7

  • affected 32-bit Systems Service Pack 1
  • affected x64-based Systems Service Pack 1

• Microsoft · Windows Server 2012 R2

  • affected (Server Core installation)

• Microsoft · Windows RT 8.1

  • affected Windows RT 8.1

• Microsoft · Windows Server 2008

  • affected 32-bit Systems Service Pack 2
  • affected 32-bit Systems Service Pack 2 (Server Core installation)
  • affected Itanium-Based Systems Service Pack 2
  • affected x64-based Systems Service Pack 2
  • affected x64-based Systems Service Pack 2 (Server Core installation)

• Microsoft · Windows Server 2019

  • affected (Server Core installation)

• Microsoft · Windows Server 2012

  • affected (Server Core installation)

• Microsoft · Windows 8.1

  • affected 32-bit systems
  • affected x64-based systems

• Microsoft · Windows Server 2016

  • affected (Server Core installation)

• Microsoft · Windows Server 2008 R2

  • affected Itanium-Based Systems Service Pack 1
  • affected x64-based Systems Service Pack 1
  • affected x64-based Systems Service Pack 1 (Server Core installation)

• Microsoft · Windows 10

  • affected 32-bit Systems
  • affected Version 1607 for 32-bit Systems
  • affected Version 1607 for x64-based Systems
  • affected Version 1703 for 32-bit Systems
  • affected Version 1703 for x64-based Systems
  • affected Version 1709 for 32-bit Systems
  • affected Version 1709 for ARM64-based Systems
  • affected Version 1709 for x64-based Systems
  • affected Version 1803 for 32-bit Systems
  • affected Version 1803 for ARM64-based Systems
  • affected Version 1803 for x64-based Systems
  • affected Version 1809 for 32-bit Systems
  • affected Version 1809 for ARM64-based Systems
  • affected Version 1809 for x64-based Systems
  • affected x64-based Systems

• Microsoft · Windows 10 Servers

  • affected version 1709 (Server Core Installation)
  • affected version 1803 (Server Core Installation)

References (3)

• 106093 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8639 (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-8639 (opens in a new tab)government-resource

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• CISA KEV catalog (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2018-8639](https://trackcve.app/badge/CVE-2018-8639.svg)](https://trackcve.app/cve/CVE-2018-8639)

Record last updated 21 Oct 2025, 23:45 UTC.