All vulnerabilities
CVE-2018-8639

Microsoft Windows Win32k Improper Resource Shutdown or Release Vulnerability

Microsoft WindowsOperating systems
Open in ThreatlineRecord JSON
CVSS
8.4High
ExploitationExploited in the wildAdded to KEV 3 Mar 2025. Known ransomware useCISA KEV
Exploit odds (EPSS)22.2%Chance of exploitation activity in the next 30 days, higher than 97% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Federal deadline24 Mar 2025Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA KEV

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Timeline

  1. 12 Dec 2018, 00:00 UTCPublishedCVE List
  2. 3 Mar 2025Added to CISA KEVCISA KEV

Description

Microsoft Windows Win32k contains an improper resource shutdown or release vulnerability that allows for local, authenticated privilege escalation. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode.

Text from CVE List

Affected versions 34

  • Windows 7affected: 32-bit Systems Service Pack 1CVE List
  • Windows 7affected: x64-based Systems Service Pack 1CVE List
  • Windows Server 2012 R2affected: (Server Core installation)CVE List
  • Windows RT 8.1affected: Windows RT 8.1CVE List
  • Windows Server 2008affected: 32-bit Systems Service Pack 2CVE List
  • Windows Server 2008affected: 32-bit Systems Service Pack 2 (Server Core installation)CVE List
  • Windows Server 2008affected: Itanium-Based Systems Service Pack 2CVE List
  • Windows Server 2008affected: x64-based Systems Service Pack 2CVE List
  • Windows Server 2008affected: x64-based Systems Service Pack 2 (Server Core installation)CVE List
  • Windows Server 2019affected: (Server Core installation)CVE List
  • Windows Server 2012affected: (Server Core installation)CVE List
  • Windows 8.1affected: 32-bit systemsCVE List
  • Windows 8.1affected: x64-based systemsCVE List
  • Windows Server 2016affected: (Server Core installation)CVE List
  • Windows Server 2008 R2affected: Itanium-Based Systems Service Pack 1CVE List
  • Windows Server 2008 R2affected: x64-based Systems Service Pack 1CVE List
  • Windows Server 2008 R2affected: x64-based Systems Service Pack 1 (Server Core installation)CVE List
  • Windows 10affected: 32-bit SystemsCVE List
  • Windows 10affected: Version 1607 for 32-bit SystemsCVE List
  • Windows 10affected: Version 1607 for x64-based SystemsCVE List
  • Windows 10affected: Version 1703 for 32-bit SystemsCVE List
  • Windows 10affected: Version 1703 for x64-based SystemsCVE List
  • Windows 10affected: Version 1709 for 32-bit SystemsCVE List
  • Windows 10affected: Version 1709 for ARM64-based SystemsCVE List
  • Windows 10affected: Version 1709 for x64-based SystemsCVE List
  • Windows 10affected: Version 1803 for 32-bit SystemsCVE List
  • Windows 10affected: Version 1803 for ARM64-based SystemsCVE List
  • Windows 10affected: Version 1803 for x64-based SystemsCVE List
  • Windows 10affected: Version 1809 for 32-bit SystemsCVE List
  • Windows 10affected: Version 1809 for ARM64-based SystemsCVE List
  • Windows 10affected: Version 1809 for x64-based SystemsCVE List
  • Windows 10affected: x64-based SystemsCVE List
  • Windows 10 Serversaffected: version 1709 (Server Core Installation)CVE List
  • Windows 10 Serversaffected: version 1803 (Server Core Installation)CVE List

References 4