# CVE-2018-8639

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.

- Page: https://www.vulneraibility.com/cve/CVE-2018-8639
- CVSS: 7.8
- Known exploited: yes, in CISA KEV since 2025-03-03; CISA due date 2025-03-24; known ransomware use
- EPSS: 22.18%
- Unvetted proof-of-concept code on GitHub: 2 GitHub proofs of concept (first 2019-03-05)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2025-03-03)
- Weakness: CWE-404
- Published: 2018-12-12

## Affected versions

- Microsoft Windows 10: affected 32-bit Systems; Version 1607 for 32-bit Systems; Version 1607 for x64-based Systems; Version 1703 for 32-bit Systems; Version 1703 for x64-based Systems; Version 1709 for 32-bit Systems; Version 1709 for ARM64-based Systems; Version 1709 for x64-based Systems; Version 1803 for 32-bit Systems; Version 1803 for ARM64-based Systems; Version 1803 for x64-based Systems; Version 1809 for 32-bit Systems; Version 1809 for ARM64-based Systems; Version 1809 for x64-based Systems; x64-based Systems
- Microsoft Windows 10 Servers: affected version 1709  (Server Core Installation); version 1803  (Server Core Installation)
- Microsoft Windows 7: affected 32-bit Systems Service Pack 1; x64-based Systems Service Pack 1
- Microsoft Windows 8.1: affected 32-bit systems; x64-based systems
- Microsoft Windows RT 8.1: affected Windows RT 8.1
- Microsoft Windows Server 2008: affected 32-bit Systems Service Pack 2; 32-bit Systems Service Pack 2 (Server Core installation); Itanium-Based Systems Service Pack 2; x64-based Systems Service Pack 2; x64-based Systems Service Pack 2 (Server Core installation)
- Microsoft Windows Server 2008 R2: affected Itanium-Based Systems Service Pack 1; x64-based Systems Service Pack 1; x64-based Systems Service Pack 1 (Server Core installation)
- Microsoft Windows Server 2012: affected (Server Core installation)
- Microsoft Windows Server 2012 R2: affected (Server Core installation)
- Microsoft Windows Server 2016: affected (Server Core installation)
- Microsoft Windows Server 2019: affected (Server Core installation)

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] http://www.securityfocus.com/bid/106093
- [other] https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8639
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-8639

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.