SARA / Free Tools / CVE / CVE-2020-0646

CVE-2020-0646 — Microsoft .NET Framework Remote Code Execution Vulnerability

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
EPSS
93.86% (top 0.10%)
CWE
Published
2020-01-14T23:11:38.000Z
Last modified
2025-10-21T23:35:53.664Z
CVSS vector
CISA KEV — Actively Exploited
Added to KEV
2021-11-03
BOD 22-01 due
2022-05-03
Ransomware use
Unknown

01What is this vulnerability?

A remote code execution vulnerability exists when the Microsoft .NET Framework fails to validate input properly, aka '.NET Framework Remote Code Execution Injection Vulnerability'.

02Affected products

VendorProductVersions
MicrosoftMicrosoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2Windows 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)
MicrosoftMicrosoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2Windows 10 Version 1607 for 32-bit Systems
MicrosoftMicrosoft .NET Framework 4.8 on Windows 10 Version 1803 for 32bit Systems — unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows 10 Version 1803 for x64based Systems — unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows Server, version 1803 (Server Core Installation)unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows 10 Version 1709 for 32bit Systems — unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows 10 Version 1709 for x64based Systems — unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows 10 Version 1607 for 32bit Systems — unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows 10 Version 1607 for x64based Systems — unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows Server 2016unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation)unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows 7 for 32bit Systems Service Pack 1 — unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows 7 for x64based Systems Service Pack 1 — unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows 8.1 for 32bit systems — unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows 8.1 for x64based systems — unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows RT 8.1unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows Server 2008 R2 for x64based Systems Service Pack 1 — unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows Server 2008 R2 for x64based Systems Service Pack 1 (Server Core installation) — unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows Server 2012unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation)unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows Server 2012 R2unspecified
MicrosoftMicrosoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation)unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32bit Systems — unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64based Systems — unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8 on Windows Server 2019unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation)unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32bit Systems — unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64based Systems — unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1903 (Server Core installation)1903
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32bit Systems — unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64based Systems — unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation)unspecified
MicrosoftMicrosoft .NET Framework 4.6Windows Server 2008 for 32-bit Systems Service Pack 2, Windows Server 2008 for x64-based Systems Service Pack 2
MicrosoftMicrosoft .NET Framework 3.0Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2, Service Pack 2 on Windows Server 2008 for Itanium-Based Systems Service Pack 2, Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2
MicrosoftMicrosoft .NET Framework 3.5Windows 10 Version 1607 for 32-bit Systems, 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)
MicrosoftMicrosoft .NET Framework 3.5.1Windows 7 for 32-bit Systems Service Pack 1, Windows 7 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for Itanium-Based Systems Service Pack 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)
MicrosoftMicrosoft .NET Framework 4.5.2Windows 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)
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32bit Systems — unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1909 (Server Core installation)unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for x64based Systems — unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.2 on Windows Server, version 1803 (Server Core Installation)unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.2 on Windows 10 for 32bit Systems — unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for 32bit Systems — unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for x64based Systems — unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for x64based Systems — unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 (Server Core installation)unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.2 on Windows 10 for x64based Systems — unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32bit Systems — unspecified
MicrosoftMicrosoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for 32bit Systems — unspecified

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2021-11-03. Ransomware use: Unknown.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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