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Vulnerabilities

Vulnerability · CVE-2020-0646

Microsoft .NET Framework Remote Code Execution Vulnerability

Published Jan 14, 2020 · catalog updated Jun 16, 2026 · Microsoft .NET Framework

Patch now

CVE-2020-0646 is in the CISA known-exploited catalog, due May 3, 2022. Confirm Microsoft .NET Framework against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
99.22%
Remediation
Remediation guidance
Affected products
cpe microsoft/.net framework · vendor Microsoft .NET Framework

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/.net framework3.0
  • cpe microsoft/.net framework3.5
  • cpe microsoft/.net framework3.5.1
  • cpe microsoft/.net framework4.5.2
  • cpe microsoft/.net framework4.6.2
  • cpe microsoft/.net framework4.7
  • cpe microsoft/.net framework4.7.1
  • cpe microsoft/.net framework4.7.2
  • vendor Microsoft .NET Frameworkversion unspecified

How to fix CVE-2020-0646

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2020-0646 is in the CISA known-exploited catalog, due May 3, 2022. Confirm Microsoft .NET Framework against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with microsoft/.net framework 3.0; microsoft/.net framework 3.5; microsoft/.net framework 3.5.1; microsoft/.net framework 4.5.2. Apply updates per vendor instructions.

What should an analyst verify?

CWE-91: XML Injection. EPSS 99.22%. The CISA KEV listing is the exploitation evidence. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 14, 2020 · Catalog

    Detected

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

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. May 3, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

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

Sources

  • CISA KEVConfirmed exploitationCVE-2020-0646

    Microsoft .NET Framework contains an improper input validation vulnerability that allows for remote code execution.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2020-0646

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-0646

    30-day exploitation probability 99.2%

    first.org
  • Exploit DatabasePublic exploit reference48275

    Public archive entry. The exploit body is not stored here.

    exploit-db.com
  • Metasploit ModulesPublic exploit moduleexploit_windows/http/sharepoint_workflows_xoml

    Public module reference (excellent). Module source is not copied into this catalog.

    rapid7.com
  • NIST NVDVulnerability recordCVE-2020-0646

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

    nvd.nist.gov
  • Packet Storm SecurityCited referencehttp://packetstormsecurity.com/files/156930/SharePoint-Workflows-XOML-Injection.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com
  • VulnCheck KEVConfirmed exploitationCVE-2020-0646

    Microsoft .NET Framework contains an improper input validation vulnerability that allows for remote code execution.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.