Is CVE-2020-0646 actively exploited?

Yes. KEV Intelligence tracks CVE-2020-0646 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has KEV Intelligence observed?

KEV Intelligence has not yet recorded sensor-observed exploitation attempts for CVE-2020-0646. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

CVE-2020-0646 affects Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 and 55 other products. KEV Intelligence lists 87 version rows; examples include Windows 7 for 32-bit Systems Service Pack 1, Windows 7 for x64-based Systems Service Pack 1, and Windows 8.1 for 32-bit systems.

Yes. CVE-2020-0646 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2020-0646

Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 Remote Code Execution

Microsoft / Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 · Windows 7 for 32-bit Systems Service Pack 1

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Severity: CVSS 9.8 · Critical
Confidence: Confirmed
Exploit status: Exploited in the wild
EPSS: 99.2%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2020-0646 is an unauthenticated vulnerability affecting Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 and 55 other products. A remote code execution vulnerability exists when the Microsoft...

Is it exploited?

Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.

Who is affected?

Microsoft / Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 windows 7 for 32-bit systems service pack 1.

What should we do?

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

Overview

Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 Remote Code Execution

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

Vendor Product Affected 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

Published: 14 Jan 2020
Exploitation Reported: 03 Nov 2021
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2020-0646
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...

Exploitation evidence

Why KEV Intelligence marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 03 Nov 2021

Independent exploitation attestation added to the KEV Intelligence record.

Proof of concept available

Recorded 28 Apr 2025

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

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

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

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets: 0
User-Agents: 0

Raw values available in Pro and Enterprise.

Scanner coverage

Metasploit template detected 28 Apr 2025.

View Metasploit template

Virtual patch status

No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework 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	28 Apr 2025

Risk and context

Severity, weaknesses, and research context

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

EPSS

99.2%

Weaknesses

XML Injection (aka Blind XPath Injection) CWE-91

All 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

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

Timeline

From disclosure to observed exploitation

28 Apr 2025
Metasploit module available

Exploit module available
28 Apr 2025
Public PoC available

Public proof-of-concept code published
03 Nov 2021
Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
14 Jan 2020
CVE published

Vulnerability disclosed publicly
04 Nov 2019
CVE ID reserved

Identifier reserved by the CNA

Pro API

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

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

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

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2020-0646",
  "confidence": "Confirmed",
  "cvss_score": 9.8,
  "cvss_estimated": false,
  "epss_score": 0.99222,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

Early warning alerts

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CVE-2020-0646

Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 Remote Code Execution

Tags

CVE References

Exploited in the wild

Proof of concept available

Known exploited vulnerability sources

Observed signals

Scanner coverage

Virtual patch status

Scanner Artifacts

Weaknesses

All CVSS Scores

Potential Proof of Concepts

Metasploit module available

Public PoC available

Added to CISA KEV

CVE published

CVE ID reserved

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