CVE-2020-0646
Microsoft .NET Framework Remote Code Execution Vulnerability
- Critical 9.8
- Exploited: added to CISA KEV 3 Nov 2021
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'.
Key facts
- Published
- 14 Jan 2020
- Last changed
- 21 Oct 2025
- Assigned by
- microsoft
- KEV added
- 3 Nov 2021
- KEV fix due
- 3 May 2022
- EPSS
- 99.222% likely to be exploited in the next 30 days, higher than 99.936% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: yes; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 9.8CVSS 3.1, Criticalfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 |
|
| Microsoft | Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 |
|
| 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 Server, version 1803 (Server Core Installation) |
|
| 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 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 Server 2016 |
|
| Microsoft | Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation) |
|
| 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 (Server Core installation) |
|
| 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 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 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 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 Server, version 1903 (Server Core installation) |
|
| 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 4.6 |
|
| Microsoft | Microsoft .NET Framework 3.0 |
|
| Microsoft | Microsoft .NET Framework 3.5 |
|
| Microsoft | Microsoft .NET Framework 3.5.1 |
|
| Microsoft | Microsoft .NET Framework 4.5.2 |
|
| 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 Server, version 1909 (Server Core installation) |
|
| 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 4.7.2 on Windows Server, version 1803 (Server Core Installation) |
|
| 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 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 4.7.1/4.7.2 on Windows 10 Version 1709 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 (Server Core installation) |
|
| Microsoft | Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 for x64-based Systems |
|
| Microsoft | Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems |
|
| Microsoft | Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 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 |
|
Timeline
- 14 Jan 2020 Published
- 3 Nov 2021 CVE-2020-0646 added to CISA KEV
- 3 Nov 2021 Added to the CISA KEV catalogue