Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2018-8639

CVE-2018-8639HIGH

Microsoft Windows

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   N   N  U  H  H  H    8.4   .2218   97.6   YES

AFFECTED
  Product                 Versions                                Fixed
  Windows 7               32-bit Systems Service Pack 1 –         —
  Windows Server 2012 R2  (Server Core installation) –            —
  Windows RT 8.1          Windows RT 8.1 –                        —
  Windows Server 2008     32-bit Systems Service Pack 2 –         —
  Windows Server 2019     (Server Core installation) –            —
  Windows Server 2012     (Server Core installation) –            —
  Windows 8.1             32-bit systems –                        —
  Windows Server 2016     (Server Core installation) –            —
  Windows Server 2008 R2  Itanium-Based Systems Service Pack 1 –  —
  Windows 10              32-bit Systems –                        —
  + 1 more

TIMELINE
  Mar 14  Reserved by microsoft
  Dec 12  Published (CNA: microsoft)
  Mar 3   Added to CISA KEV, remediation due 2025-03-24

CWE-404 · CNA: microsoft · CVSS v3.1 · 3 references · KEV due March 24, 2025

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
March 14, 2018	Reserved	Reserved by microsoft
December 12, 2018	Published	Published (CNA: microsoft)
March 3, 2025	KEV ADDED	Added to CISA KEV, remediation due 2025-03-24

Affected

Affected products and packages — 11 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Windows 7	—	32-bit Systems Service Pack 1	—
Microsoft	Windows Server 2012 R2	—	(Server Core installation)	—
Microsoft	Windows RT 8.1	—	Windows RT 8.1	—
Microsoft	Windows Server 2008	—	32-bit Systems Service Pack 2	—
Microsoft	Windows Server 2019	—	(Server Core installation)	—
Microsoft	Windows Server 2012	—	(Server Core installation)	—
Microsoft	Windows 8.1	—	32-bit systems	—
Microsoft	Windows Server 2016	—	(Server Core installation)	—
Microsoft	Windows Server 2008 R2	—	Itanium-Based Systems Service Pack 1	—
Microsoft	Windows 10	—	32-bit Systems	—
Microsoft	Windows 10 Servers	—	version 1709 (Server Core Installation)	—

Weaknesses

CWE-404

References (3)

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

Authoritative record: CVE-2018-8639 at cve.org

Vendors: microsoft

Weaknesses: CWE-404

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2018-8639 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, October 7, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.