CVE DATABASE / CVE-2020-0646
CVE-2020-0646
Microsoft .NET Framework Remote Code Execution Vulnerability
CVSS 9.8 · CRITICAL
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2021-11-03.
Federal remediation due 2022-05-03.
Required action: Apply updates per vendor instructions.
Summary
A remote code execution vulnerability exists when the Microsoft .NET Framework fails to validate input properly, aka '.NET Framework Remote Code Execution Injection Vulnerability'.
CVSS 3.1 breakdown
| Base score | 9.8 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity | HIGH |
| Availability | HIGH |
Weakness type (CWE)
Affected products
Microsoft .net frameworkMicrosoft windows server 2008Microsoft windows 10 1607Microsoft windows 8.1Microsoft windows server 2012Microsoft windows server 2016Microsoft windows 10 1709Microsoft windows 10 1507Microsoft windows 10 1803Microsoft windows 10 1809Microsoft windows server 2019Microsoft windows 10 1903Microsoft windows 10 1909Microsoft windows 7Microsoft windows rt 8.1
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References
- http://packetstormsecurity.com/files/156930/SharePoint-Workflows-XOML-Injection.html
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0646
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-0646
Data: NIST NVD + CISA KEV. NVD last modified 2025-10-29. Always verify against the vendor advisory before acting.