Security CISA KEV CVE-2018-8639 CVE-2018-8639 CISA KEV
Microsoft Windows Win32k Improper Resource Shutdown or Release Vulnerability
Severity unknown CVSS unknown Check the vendor advisory for fixed versions
CISA lists this Microsoft vulnerability as known exploited. Its MSRC release detail is outside this installation's collected history.
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.
Product Windows
Added to KEV 3 Mar 2025
Federal remediation due 24 Mar 2025
Known ransomware use Yes
Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.
Cite this version Field-level log (2)
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23 Oct 2026 · 09:33:49 UTC
Source coverage: cisa-kev Incomplete → Current 23 Oct 2026 · 08:31:50 UTC
Source coverage: cisa-kev Current → Incomplete Explore global source statements, affected packages and advisory history for CVE-2018-8639 . The catalog has a separate collection scope from Microsoft release records.
More advisories, affected versions and source history
cve-program · CVE-2018-8639 Published Windows 7 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"product": "Windows 7",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "32-bit Systems Service Pack 1"
},
{
"status": "affected",
"version": "x64-based Systems Service Pack 1"
}
]
} Windows Server 2012 R2 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"product": "Windows Server 2012 R2",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "(Server Core installation)"
}
]
} Windows RT 8.1 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"product": "Windows RT 8.1",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "Windows RT 8.1"
}
]
} Windows Server 2008 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"product": "Windows Server 2008",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "32-bit Systems Service Pack 2"
},
{
"status": "affected",
"version": "32-bit Systems Service Pack 2 (Server Core installation)"
},
{
"status": "affected",
"version": "Itanium-Based Systems Service Pack 2"
},
{
"status": "affected",
"version": "x64-based Systems Service Pack 2"
},
{
"status": "affected",
"version": "x64-based Systems Service Pack 2 (Server Core installation)"
}
]
} Windows Server 2019 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"product": "Windows Server 2019",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "(Server Core installation)"
}
]
} Windows Server 2012 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"product": "Windows Server 2012",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "(Server Core installation)"
}
]
} Windows 8.1 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"product": "Windows 8.1",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "32-bit systems"
},
{
"status": "affected",
"version": "x64-based systems"
}
]
} Windows Server 2016 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"product": "Windows Server 2016",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "(Server Core installation)"
}
]
} Windows Server 2008 R2 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"product": "Windows Server 2008 R2",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "Itanium-Based Systems Service Pack 1"
},
{
"status": "affected",
"version": "x64-based Systems Service Pack 1"
},
{
"status": "affected",
"version": "x64-based Systems Service Pack 1 (Server Core installation)"
}
]
} Windows 10 Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"product": "Windows 10",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "32-bit Systems"
},
{
"status": "affected",
"version": "Version 1607 for 32-bit Systems"
},
{
"status": "affected",
"version": "Version 1607 for x64-based Systems"
},
{
"status": "affected",
"version": "Version 1703 for 32-bit Systems"
},
{
"status": "affected",
"version": "Version 1703 for x64-based Systems"
},
{
"status": "affected",
"version": "Version 1709 for 32-bit Systems"
},
{
"status": "affected",
"version": "Version 1709 for ARM64-based Systems"
},
{
"status": "affected",
"version": "Version 1709 for x64-based Systems"
},
{
"status": "affected",
"version": "Version 1803 for 32-bit Systems"
},
{
"status": "affected",
"version": "Version 1803 for ARM64-based Systems"
},
{
"status": "affected",
"version": "Version 1803 for x64-based Systems"
},
{
"status": "affected",
"version": "Version 1809 for 32-bit Systems"
},
{
"status": "affected",
"version": "Version 1809 for ARM64-based Systems"
},
{
"status": "affected",
"version": "Version 1809 for x64-based Systems"
},
{
"status": "affected",
"version": "x64-based Systems"
}
]
} Windows 10 Servers Vendor product
Publisher's version information Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"product": "Windows 10 Servers",
"vendor": "Microsoft",
"versions": [
{
"status": "affected",
"version": "version 1709 (Server Core Installation)"
},
{
"status": "affected",
"version": "version 1803 (Server Core Installation)"
}
]
} Original source record · Cite this exact observation · Complete original publisher JSON