Exploitation evidence
Known exploited · CISA KEV listed
Added 2022-05-23. Ransomware campaign use: Unknown.
CISA required action: Apply updates per vendor instructions.
CISA due date: 2022-06-13. 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
Default status: Not specified
- affected: 10 Version 1803 for 32-bit Systems
- affected: 10 Version 1803 for x64-based Systems
- affected: 10 Version 1803 for ARM64-based Systems
- affected: 10 Version 1809 for 32-bit Systems
- affected: 10 Version 1809 for x64-based Systems
- affected: 10 Version 1809 for ARM64-based Systems
- affected: 10 Version 1709 for 32-bit Systems
- affected: 10 Version 1709 for x64-based Systems
- affected: 10 Version 1709 for ARM64-based Systems
- affected: 10 for 32-bit Systems
- affected: 10 for x64-based Systems
- affected: 10 Version 1607 for 32-bit Systems
- affected: 10 Version 1607 for x64-based Systems
- affected: 7 for 32-bit Systems Service Pack 1
- affected: 7 for x64-based Systems Service Pack 1
- affected: 8.1 for 32-bit systems
- affected: 8.1 for x64-based systems
- affected: RT 8.1
Microsoft / Windows Server
Default status: Not specified
- affected: version 1803 (Core Installation)
- affected: 2019
- affected: 2019 (Core installation)
- affected: 2016
- affected: 2016 (Core installation)
- affected: 2008 for 32-bit Systems Service Pack 2
- affected: 2008 for 32-bit Systems Service Pack 2 (Core installation)
- affected: 2008 for Itanium-Based Systems Service Pack 2
- affected: 2008 for x64-based Systems Service Pack 2
- affected: 2008 for x64-based Systems Service Pack 2 (Core installation)
- affected: 2008 R2 for Itanium-Based Systems Service Pack 1
- affected: 2008 R2 for x64-based Systems Service Pack 1
- affected: 2008 R2 for x64-based Systems Service Pack 1 (Core installation)
- affected: 2012
- affected: 2012 (Core installation)
- affected: 2012 R2
- affected: 2012 R2 (Core installation)
Microsoft / Windows 10 Version 1909 for 32-bit Systems
Default status: Not specified
- affected: unspecified
Microsoft / Windows 10 Version 1909 for x64-based Systems
Default status: Not specified
- affected: unspecified
Microsoft / Windows 10 Version 1909 for ARM64-based Systems
Default status: Not specified
- affected: unspecified
Microsoft / Windows Server, version 1909 (Server Core installation)
Default status: Not specified
- affected: unspecified
Microsoft / Windows 10 Version 1903 for 32-bit Systems
Default status: Not specified
- affected: unspecified
Microsoft / Windows 10 Version 1903 for x64-based Systems
Default status: Not specified
- affected: unspecified
Microsoft / Windows 10 Version 1903 for ARM64-based Systems
Default status: Not specified
- affected: unspecified
Microsoft / Windows Server, version 1903 (Server Core installation)
Default status: Not specified
- affected: unspecified
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
CVE Program record ↗ · Download tracked evidence as JSON
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1027
- http://packetstormsecurity.com/files/168068/Windows-sxs-CNodeFactory-XMLParser_Element_doc_assembly_assemblyIdentity-Heap-Buffer-Overflow.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-1027
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": 0.04723,
"percentile": 0.91963
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.04723,
"percentile": 0.91913
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.04723,
"percentile": 0.91903
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.04723,
"percentile": 0.91899
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.04723,
"percentile": 0.91893
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.04723,
"percentile": 0.9188
}06 Nov 2026, 06:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
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"status": "affected",
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"status": "affected",
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"status": "affected",
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},
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"vendor": "Microsoft",
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{
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{
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},
"cveMetadata": {
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"cveId": "CVE-2020-1027",
"datePublished": "2020-04-15T15:13:29.000Z",
"dateReserved": "2019-11-04T00:00:00.000Z",
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}05 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.04723,
"percentile": 0.91871
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.04723,
"percentile": 0.91865
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.04723,
"percentile": 0.9185
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.04723,
"percentile": 0.91839
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2020-1027",
"cwes": [
"CWE-787"
],
"dateAdded": "2022-05-23",
"dueDate": "2022-06-13",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://nvd.nist.gov/vuln/detail/CVE-2020-1027",
"product": "Windows",
"requiredAction": "Apply updates per vendor instructions.",
"shortDescription": "An elevation of privilege vulnerability exists in the way that the Windows Kernel handles objects in memory. An attacker who successfully exploited the vulnerability could execute code with elevated permissions.",
"vendorProject": "Microsoft",
"vulnerabilityName": "Microsoft Windows Kernel Privilege Escalation Vulnerability"
}