CVE-2020-0646

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

Critical9.8Known exploitedEPSS 99.2%

Published: 14 Jan 2020
Updated: 21 Oct 2025
Reserved: 4 Nov 2019
Assigned by: microsoft

Description

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

Exploited in the wild

CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Microsoft .NET Framework Remote Code Execution Vulnerability.

Added: 3 Nov 2021
Fix due (US federal): 3 May 2022
Used by ransomware: Not known

Apply updates per vendor instructions.

Scores

CVSS scores of CVE-2020-0646, by who scored it
Scored by	CVSS	Score	Vector
CISA-ADPADP (enrichment)	3.1	Critical9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Analyzed	3.1	Critical9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS (exploitation in 30 days): 99.2% · top 0.1% of all CVEs (6 Nov 2026)
CISA SSVC: Exploitation: active · Automatable: yes · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.

Weakness

Remote Code Execution
CWE-91 XML Injection (aka Blind XPath Injection) (opens in a new tab)All about CWE-91 and its CVEs

Affected products

Microsoft · Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2
- affected Windows 7 for 32-bit Systems Service Pack 1
- affected Windows 7 for x64-based Systems Service Pack 1
- affected Windows 8.1 for 32-bit systems
- affected Windows 8.1 for x64-based systems
- affected Windows RT 8.1
- affected Windows Server 2008 R2 for x64-based Systems Service Pack 1
- affected Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
- affected Windows Server 2012
- affected Windows Server 2012 (Server Core installation)
- affected Windows Server 2012 R2
- affected Windows Server 2012 R2 (Server Core installation)
Microsoft · Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2
- affected Windows 10 Version 1607 for 32-bit Systems
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server, version 1803 (Server Core Installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2016
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows RT 8.1
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2012
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2012 R2
- affected unspecified
Microsoft · Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1903 (Server Core installation)
- affected 1903
Microsoft · Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 4.6
- affected Windows Server 2008 for 32-bit Systems Service Pack 2
- affected Windows Server 2008 for x64-based Systems Service Pack 2
Microsoft · Microsoft .NET Framework 3.0
- affected Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2
- affected Service Pack 2 on Windows Server 2008 for Itanium-Based Systems Service Pack 2
- affected Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2
Microsoft · Microsoft .NET Framework 3.5
- affected Windows 10 Version 1607 for 32-bit Systems
- affected Windows 8.1 for 32-bit systems
- affected Windows 8.1 for x64-based systems
- affected Windows Server 2012
- affected Windows Server 2012 (Server Core installation)
- affected Windows Server 2012 R2
- affected Windows Server 2012 R2 (Server Core installation)
Microsoft · Microsoft .NET Framework 3.5.1
- affected Windows 7 for 32-bit Systems Service Pack 1
- affected Windows 7 for x64-based Systems Service Pack 1
- affected Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1
- affected Windows Server 2008 R2 for x64-based Systems Service Pack 1
- affected Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Microsoft · Microsoft .NET Framework 4.5.2
- affected Windows 7 for 32-bit Systems Service Pack 1
- affected Windows 7 for x64-based Systems Service Pack 1
- affected Windows 8.1 for 32-bit systems
- affected Windows 8.1 for x64-based systems
- affected Windows RT 8.1
- affected Windows Server 2008 for 32-bit Systems Service Pack 2
- affected Windows Server 2008 for x64-based Systems Service Pack 2
- affected Windows Server 2008 R2 for x64-based Systems Service Pack 1
- affected Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
- affected Windows Server 2012
- affected Windows Server 2012 (Server Core installation)
- affected Windows Server 2012 R2
- affected Windows Server 2012 R2 (Server Core installation)
Microsoft · Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1909 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server, version 1803 (Server Core Installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for 32-bit Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for x64-based Systems
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 (Server Core installation)
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 for x64-based Systems
- affected unspecified
Microsoft · 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
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for 32-bit Systems
- affected unspecified
Microsoft · 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
- affected unspecified
Microsoft · Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016
- affected unspecified

References (3)

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0646 (opens in a new tab)x_refsource_MISCx_transferred
http://packetstormsecurity.com/files/156930/SharePoint-Workflows-XOML-Injection.html (opens in a new tab)x_refsource_MISCx_transferred
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0646 (opens in a new tab)government-resource

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

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Record last updated 21 Oct 2025, 23:35 UTC.