CVE-2020-0646

Confirmed PUBLISHED

A remote code execution vulnerability exists when the Microsoft .NET Framework fails to validate input properly, aka '.NET Framework Remote Code...

Microsoft · Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems, Microsoft .NET Framework 4.8 on Windows Server, version 1803 (Server Core Installation), Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems, Microsoft .NET Framework 4.8 on Windows Server 2016, Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation), Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1, Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1, Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems, Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems, Microsoft .NET Framework 4.8 on Windows RT 8.1, Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1, Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation), Microsoft .NET Framework 4.8 on Windows Server 2012, Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation), Microsoft .NET Framework 4.8 on Windows Server 2012 R2, Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation), Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation), Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1903 (Server Core installation), Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation), Microsoft .NET Framework 4.6, Microsoft .NET Framework 3.0, Microsoft .NET Framework 3.5, Microsoft .NET Framework 3.5.1, Microsoft .NET Framework 4.5.2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1909 (Server Core installation), Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server, version 1803 (Server Core Installation), Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 (Server Core installation), Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016

Exploited in the wild PoC available

Recommended Action

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

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Confidence

Confirmed

Exploitation Status

Exploited in the wild

Observed in Sensors

Attempts (30d)

—

Unique Attacker IPs

—

CISA KEV

In CISA KEV

CVSS / EPSS

9.8 Critical

At a Glance

A remote code execution vulnerability exists when the Microsoft .NET Framework fails to validate input properly, aka '.NET Framework Remote Code Execution Injection Vulnerability'.

cisa dotnet microsoft windows metasploit

CVE Published: Jan 14, 2020
Exploitation Reported: Nov 03, 2021
CVSS: 9.8 Critical
EPSS: —

Remote Low complexity No user interaction Unauthenticated

Affected Versions

87 version rows · page 3 of 4

Vendor	Product	Version	Status
Microsoft	Microsoft .NET Framework 3.5	Windows 8.1 for x64-based systems	Affected
Microsoft	Microsoft .NET Framework 3.5	Windows Server 2012	Affected
Microsoft	Microsoft .NET Framework 3.5	Windows Server 2012 (Server Core installation)	Affected
Microsoft	Microsoft .NET Framework 3.5	Windows Server 2012 R2	Affected
Microsoft	Microsoft .NET Framework 3.5	Windows Server 2012 R2 (Server Core installation)	Affected
Microsoft	Microsoft .NET Framework 3.5.1	Windows 7 for 32-bit Systems Service Pack 1	Affected
Microsoft	Microsoft .NET Framework 3.5.1	Windows 7 for x64-based Systems Service Pack 1	Affected
Microsoft	Microsoft .NET Framework 3.5.1	Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1	Affected
Microsoft	Microsoft .NET Framework 3.5.1	Windows Server 2008 R2 for x64-based Systems Service Pack 1	Affected
Microsoft	Microsoft .NET Framework 3.5.1	Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)	Affected
Microsoft	Microsoft .NET Framework 4.5.2	Windows 7 for 32-bit Systems Service Pack 1	Affected
Microsoft	Microsoft .NET Framework 4.5.2	Windows 7 for x64-based Systems Service Pack 1	Affected
Microsoft	Microsoft .NET Framework 4.5.2	Windows 8.1 for 32-bit systems	Affected
Microsoft	Microsoft .NET Framework 4.5.2	Windows 8.1 for x64-based systems	Affected
Microsoft	Microsoft .NET Framework 4.5.2	Windows RT 8.1	Affected
Microsoft	Microsoft .NET Framework 4.5.2	Windows Server 2008 for 32-bit Systems Service Pack 2	Affected
Microsoft	Microsoft .NET Framework 4.5.2	Windows Server 2008 for x64-based Systems Service Pack 2	Affected
Microsoft	Microsoft .NET Framework 4.5.2	Windows Server 2008 R2 for x64-based Systems Service Pack 1	Affected
Microsoft	Microsoft .NET Framework 4.5.2	Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)	Affected
Microsoft	Microsoft .NET Framework 4.5.2	Windows Server 2012	Affected
Microsoft	Microsoft .NET Framework 4.5.2	Windows Server 2012 (Server Core installation)	Affected
Microsoft	Microsoft .NET Framework 4.5.2	Windows Server 2012 R2	Affected
Microsoft	Microsoft .NET Framework 4.5.2	Windows Server 2012 R2 (Server Core installation)	Affected
Microsoft	Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32-bit Systems	unspecified	Affected
Microsoft	Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1909 (Server Core installation)	unspecified	Affected

CVE References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0646 portal.msrc.microsoft.com · CVE Record https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CV...
packetstormsecurity.com/files/156930/SharePoint-Workflows-XOML-Injec... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/156930/SharePoint-Workflows-XOML...

Recommended Actions

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.

Known Exploited Vulnerability Sources

Catalogues that list this CVE as a known exploited vulnerability.

Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.

Learn about Pro API access

Source	Added
CISA First	2021-11-03 00:00 UTC

Scanner Artifacts

Nuclei and Metasploit references linked to this CVE.

Scanner	Reference	Detected
Metasploit	https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/http/sharepoint_workflows_xoml.rb	Apr 28, 2025

CVSS Scores

CVSS v3.1 9.8 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 10.0 High

AV:N/AC:L/Au:N/C:C/I:C/A:C

Exploitation Status

Exploited in the wild

Recorded 2021-11-03 00:00:00 UTC · CISA

Proof of concept available

Recorded 2025-04-28 15:02:56 UTC

Weaknesses (CWE)

CWE-91

XML Injection (aka Blind XPath Injection)

Scanner Integrations

Scanner	Reference	Detected
Metasploit	https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/windows/http/sharepoint_workflows_xoml.rb	Apr 28, 2025

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

sharepoint_workflows_xoml

metasploit · Created Unknown

Metasploit module for CVE-2020-0646

Automate This Intelligence with the Pro API

Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Pro API Example

GET /api/v2/pro/kevs/CVE-2020-0646

{
  "cve_id": "CVE-2020-0646",
  "title": "A remote code execution vulnerability exists when the Microsoft .NET Framewor...",
  "affected_vendor": "Microsoft",
  "affected_product": "Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2, Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems, Microsoft .NET Framework 4.8 on Windows Server, version 1803  (Server Core Installation), Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems, Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems, Microsoft .NET Framework 4.8 on Windows Server 2016, Microsoft .NET Framework 4.8 on Windows Server 2016  (Server Core installation), Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1, Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1, Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems, Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems, Microsoft .NET Framework 4.8 on Windows RT 8.1, Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1, Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation), Microsoft .NET Framework 4.8 on Windows Server 2012, Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation), Microsoft .NET Framework 4.8 on Windows Server 2012 R2, Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation), Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019  (Server Core installation), Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1903 (Server Core installation), Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019  (Server Core installation), Microsoft .NET Framework 4.6, Microsoft .NET Framework 3.0, Microsoft .NET Framework 3.5, Microsoft .NET Framework 3.5.1, Microsoft .NET Framework 4.5.2, Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1909 (Server Core installation), Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server, version 1803  (Server Core Installation), Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016  (Server Core installation), Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for 32-bit Systems, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016",
  "affected_versions": [
    { "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
  ],
  "confidence": "Confirmed",
  "cvss_score": 9.8,
  "epss_score": null,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "...": "Pro API fields" },
  "proof_of_concepts": [ "..." ],
  "scanner_integrations": [ "..." ]
}

The free JSON API returns basic KEV fields only. Confidence, telemetry, and artifact enrichment require Pro API access.

CVE-2020-0646

At a Glance

Affected Versions

CVE References

Recommended Actions

Known Exploited Vulnerability Sources

Scanner Artifacts

Virtual Patch

CVSS Scores

Exploitation Status

Weaknesses (CWE)

Scanner Integrations

Potential Proof of Concepts

Timeline

Automate This Intelligence with the Pro API