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Weekly Signal
Live intelligence Updated 19 Aug 2026 · 20:27 UTC

Microsoft · .net Core, .net Framework, .NET Framework, SharePoint, Visual Studio +4 more

CVE-2020-1147

Microsoft .NET Framework, SharePoint, and Visual Studio Remote Code Execution Vulnerability

Recommended action

Validate affected assets and exposure now, then remediate on an accelerated schedule. Microsoft Security patch CVE-2020-1147

View response plan
CVSS7.8
EPSS94.3%
KEVYes
ExploitationConfirmed exploitation
RemediationExplicit patch identified ↓

Assessment

Why it matters

CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 94.3%; technical severity is CVSS 7.8.

A remote code execution vulnerability exists in .NET Framework, Microsoft SharePoint, and Visual Studio when the software fails to check the source markup of XML file input, aka '.NET Framework, SharePoint Server, and Visual Studio Remote Code Execution Vulnerability'.

Who should care

  • Teams operating .net Core, .net Framework, .NET Framework, SharePoint, Visual Studio +4 more
  • Vulnerability and exposure management teams
  • Security operations teams monitoring exploitation activity

Response plan

What I would do

  1. Confirm whether .net Core, .net Framework, .NET Framework, SharePoint, Visual Studio +4 more is present in the environment.
  2. Identify affected versions and establish whether vulnerable services are exposed or reachable.
  3. Microsoft Security patch CVE-2020-1147
  4. Review relevant security telemetry for evidence of attempted or successful exploitation.
  5. Document the remediation decision and track it to verified completion.

Treatment intelligence

Remediation intelligence

Not yet verified

Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.

Verification noteAutomated link verification has not completed for this guidance yet.

Patch

Required Action

Technical details

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
Not classified
Affected versions
Microsoft .net Core (Version 2.1 | Version 3.1); Microsoft .net Framework (Version 2.0 | Version 3.0 | Version 3.5 | Version 3.5); Microsoft .NET Framework, SharePoint, Visual Studio; Microsoft Sharepoint Enterprise Server (Version 2013 | Version 2016); Microsoft Sharepoint Server (Version 2010 | Version 2019); Microsoft Visual Studio 2017 (Start Including 15.0, End Including 15.9); Microsoft Visual Studio 2019 (Start Including 16.0, End Including 16.6)
Fixed versions
No explicit fixed version is currently recorded.
Published
14 July 2020
Attack vector
Local
Privileges required
None
User interaction
Required

Signal timeline

  1. CVE published
  2. Added to CISA KEV
  3. Latest EPSS score: 94.3%
  4. Signal calculated at 82

External references

Live public intelligence This assessment combines public-source evidence. Validate the affected product, version and exposure against your own environment before making a risk decision.