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CVE record · CVE-2020-0646

XML injection in Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 and others

CVSS 9.8 CriticalCriticalIn CISA KEVEPSS 0.99 · 99th percentile

Critical, because:

  • In CISA’s KEV catalogue since 3 Nov 2021: it is known to be exploited.
  • CVSS score 9.8: 9.0 or more.
  • CVSS score 9.8 (7.0 or more) and EPSS 0.99 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the CVE Program (CNA: microsoft) at 14 Jan 2020, 23:11 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
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
  • and 1 more
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

And 12 more products. The full list is on the CVE record.

Identifiers
CVE-2020-0646
CNA
microsoft
Weakness (CWE)
CWE-91
Tags
Published
14 Jan 2020
Updated
21 Oct 2025

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H ADP (CISA-ADP)
  • CISA KEV Listed since 3 Nov 2021: known to be exploited.
  • EPSS 0.99, the 99th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 14 Jan 2020. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.