# CVE-2020-0646: Microsoft .NET Framework Remote Code Execution Vulnerability > CVE-2020-0646: Microsoft .NET Framework Remote Code Execution Vulnerability. CVSS 9.8 (CVSS 3.1), in CISA KEV. Canonical: https://rewindex.com/cve/CVE-2020-0646 Last updated: 2025-10-21T23:35:53Z - Published: 2020-01-14 23:11 UTC · Updated: 2025-10-21 23:35 UTC · Assigner: microsoft - CVSS: 9.8 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS: 99.2%, 100th percentile (scored 2026-10-25) - CISA KEV: yes, added 2021-11-03, federal due date 2022-05-03, ransomware use: Unknown ## 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'. ## CISA required action Apply updates per vendor instructions. ## Affected vendors and products - Microsoft: Microsoft .NET Framework 3.0 - Microsoft: Microsoft .NET Framework 3.5 - Microsoft: Microsoft .NET Framework 3.5.1 - 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 - 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 - Microsoft: Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 - 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) - Microsoft: Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for 32-bit Systems - Microsoft: Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for x64-based Systems - Microsoft: Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 for 32-bit Systems - Microsoft: Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 for x64-based Systems - Microsoft: Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for 32-bit Systems - Microsoft: Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for x64-based Systems - Microsoft: Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems - Microsoft: Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems - Microsoft: Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 - Microsoft: Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation) - Microsoft: Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server, version 1803 (Server Core Installation) - Microsoft: Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems - Microsoft: Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems - Microsoft: Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32-bit Systems - Microsoft: Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64-based Systems - Microsoft: Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32-bit Systems - Microsoft: Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for x64-based Systems - Microsoft: Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 - Microsoft: Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation) - Microsoft: Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1903 (Server Core installation) - Microsoft: Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1909 (Server Core installation) - Microsoft: Microsoft .NET Framework 4.5.2 - Microsoft: Microsoft .NET Framework 4.6 - Microsoft: Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 - Microsoft: Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 - Microsoft: Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems - Microsoft: Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems - Microsoft: Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems - Microsoft: Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems - Microsoft: Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems - Microsoft: Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems - Microsoft: Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1 - Microsoft: Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1 - Microsoft: Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems - Microsoft: Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems - Microsoft: Microsoft .NET Framework 4.8 on Windows RT 8.1 - Microsoft: Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 - Microsoft: Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) - Microsoft: Microsoft .NET Framework 4.8 on Windows Server 2012 - Microsoft: Microsoft .NET Framework 4.8 on Windows Server 2012 R2 - Microsoft: Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation) - Microsoft: Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation) - Microsoft: Microsoft .NET Framework 4.8 on Windows Server 2016 - Microsoft: Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation) - Microsoft: Microsoft .NET Framework 4.8 on Windows Server, version 1803 (Server Core Installation) ## References - [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2020-0646) - [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2020-0646) - [http://packetstormsecurity.com/files/156930/SharePoint-Workflows-XOML-Injection.html](http://packetstormsecurity.com/files/156930/SharePoint-Workflows-XOML-Injection.html) - [https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0646](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0646) --- _Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_ --- Canonical: https://rewindex.com/cve/CVE-2020-0646 · Markdown: https://rewindex.com/cve/CVE-2020-0646.md · JSON: https://rewindex.com/api/v1/cves/CVE-2020-0646 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:05:43.054Z