Exploitation evidence
Known exploited · CISA KEV listed
Added 2025-03-03. Ransomware campaign use: Known.
CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA due date: 2025-03-24. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Microsoft / Windows 7
Default status: Not specified
- affected: 32-bit Systems Service Pack 1
- affected: x64-based Systems Service Pack 1
Microsoft / Windows Server 2012 R2
Default status: Not specified
- affected: (Server Core installation)
Microsoft / Windows RT 8.1
Default status: Not specified
- affected: Windows RT 8.1
Microsoft / Windows Server 2008
Default status: Not specified
- 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
Default status: Not specified
- affected: (Server Core installation)
Microsoft / Windows Server 2012
Default status: Not specified
- affected: (Server Core installation)
Microsoft / Windows 8.1
Default status: Not specified
- affected: 32-bit systems
- affected: x64-based systems
Microsoft / Windows Server 2016
Default status: Not specified
- affected: (Server Core installation)
Microsoft / Windows Server 2008 R2
Default status: Not specified
- 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
Default status: Not specified
- 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
Default status: Not specified
- affected: version 1709 (Server Core Installation)
- affected: version 1803 (Server Core Installation)
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.22349,
"percentile": 0.97722
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.22349,
"percentile": 0.97708
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.22349,
"percentile": 0.97705
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.22349,
"percentile": 0.97705
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.22349,
"percentile": 0.97704
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.22349,
"percentile": 0.97701
}06 Nov 2026, 12:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
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"status": "affected",
"version": "Version 1709 for ARM64-based Systems"
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{
"status": "affected",
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{
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"status": "affected",
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"datePublished": "2018-12-12T00:00:00.000Z",
"dateReserved": "2018-03-14T00:00:00.000Z",
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}05 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.22349,
"percentile": 0.97699
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.22349,
"percentile": 0.97698
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.22349,
"percentile": 0.97693
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.22179,
"percentile": 0.97675
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2018-8639",
"cwes": [
"CWE-404"
],
"dateAdded": "2025-03-03",
"dueDate": "2025-03-24",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Known",
"notes": "https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2018-8639 ; https://nvd.nist.gov/vuln/detail/CVE-2018-8639",
"product": "Windows",
"requiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
"shortDescription": "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.",
"vendorProject": "Microsoft",
"vulnerabilityName": "Microsoft Windows Win32k Improper Resource Shutdown or Release Vulnerability"
}