Reference page — cumulative record through Wednesday, October 7, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2020-0646

CVE-2020-0646CRITICAL

Microsoft .NET Framework

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  H  H  H    9.8   .9922   99.9   YES

AFFECTED
  Product                                                                                   Versions                                       Fixed
  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 –  —
  Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2                                            Windows 10 Version 1607 for 32-bit Systems –   —
  Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems                unspecified –                                  —
  Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems             unspecified –                                  —
  Microsoft .NET Framework 4.8 on Windows Server, version 1803  (Server Core Installation)  unspecified –                                  —
  Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems                unspecified –                                  —
  Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems             unspecified –                                  —
  Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems                unspecified –                                  —
  Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems             unspecified –                                  —
  Microsoft .NET Framework 4.8 on Windows Server 2016                                       unspecified –                                  —
  + 42 more

TIMELINE
  Nov 4   Reserved by microsoft
  Jan 14  Published (CNA: microsoft)
  Nov 3   Added to CISA KEV, remediation due 2022-05-03

CWE-91 · CNA: microsoft · CVSS v3.1 · 3 references · KEV due May 3, 2022

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'.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
November 4, 2019	Reserved	Reserved by microsoft
January 14, 2020	Published	Published (CNA: microsoft)
November 3, 2021	KEV ADDED	Added to CISA KEV, remediation due 2022-05-03

Affected

Affected products and packages — 52 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
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	—
Microsoft	Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2	—	Windows 10 Version 1607 for 32-bit Systems	—
Microsoft	Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows Server, version 1803 (Server Core Installation)	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows Server 2016	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation)	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows RT 8.1	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows Server 2012	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation)	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows Server 2012 R2	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation)	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation)	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32-bit Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64-based Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1903 (Server Core installation)	—	1903	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation)	—	unspecified	—
Microsoft	Microsoft .NET Framework 4.6	—	Windows Server 2008 for 32-bit Systems Service Pack 2	—
Microsoft	Microsoft .NET Framework 3.0	—	Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2	—
Microsoft	Microsoft .NET Framework 3.5	—	Windows 10 Version 1607 for 32-bit Systems	—
Microsoft	Microsoft .NET Framework 3.5.1	—	Windows 7 for 32-bit Systems Service Pack 1	—
Microsoft	Microsoft .NET Framework 4.5.2	—	Windows 7 for 32-bit Systems Service Pack 1	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32-bit Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1909 (Server Core installation)	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for x64-based Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server, version 1803 (Server Core Installation)	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 for 32-bit Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for 32-bit Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for x64-based Systems	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for x64-based Systems	—	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)	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 for x64-based Systems	—	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	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for 32-bit Systems	—	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	—	unspecified	—
Microsoft	Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016	—	unspecified	—

Weaknesses

CWE-91

References (3)

http://packetstormsecurity.com/files/156930/SharePoint-Workflows-XOML-Injection.html [x_refsource_MISC]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0646 [x_refsource_MISC]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0646 [government-resource]

Authoritative record: CVE-2020-0646 at cve.org

Vendors: microsoft

Weaknesses: CWE-91

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-0646 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, October 7, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.