CVEs / CVE-2020-0646
CVE-2020-0646: Microsoft .NET Framework Remote Code Execution Vulnerability
- Known exploited in the CISA KEV catalog since 3 Nov 2021
- critical 9.8 CVSS 3.1 (NVD)
- EPSS 99.2% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
Microsoft .NET Framework contains an improper input validation vulnerability that allows for remote code execution.
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'.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| 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 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 | Windows 7 for x64-based Systems Service Pack 1 | — |
| Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 | Windows 8.1 for 32-bit systems | — |
| Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 | Windows 8.1 for x64-based systems | — |
| Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 | Windows RT 8.1 | — |
| Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | — |
| Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | — |
| Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 | Windows Server 2012 | — |
| Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 | Windows Server 2012 (Server Core installation) | — |
| Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 | Windows Server 2012 R2 | — |
| Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 | Windows Server 2012 R2 (Server Core installation) | — |
| 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 | — |
Exploitation
| In CISA KEV since | 3 Nov 2021 |
|---|---|
| Due date for US federal agencies | 3 May 2022 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply updates per vendor instructions. |
Severity
| CVSS 3.1 | 9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HScored by NVD |
|---|---|
| Weakness | CWE-91 |
References
- CVE-2020-0646 on NVD
- CVE-2020-0646 in the CISA KEV catalog
- http://packetstormsecurity.com/files/156930/SharePoint-Workflows-XOML-Injection.html Exploit, Third Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0646 Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0646 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.