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

CVE-2020-1147

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

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'.

HIGH · CVSS 7.8 ⚠ CISA KEV EPSS 0.9343
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

▤

Affected Products & Versions

6
microsoft .net coreall versions
microsoft .net frameworkall versions
microsoft sharepoint enterprise serverall versions
microsoft sharepoint serverall versions
microsoft visual studio 2017>= 15.0 and <= 15.9
microsoft visual studio 2019>= 16.0 and <= 16.6
▤

Affected Packages

12
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
NuGet Microsoft.NETCore.App HIGH fixed in 2.1.20
NuGet Microsoft.NETCore.App.Runtime.linux-arm HIGH fixed in 3.1.6
NuGet Microsoft.NETCore.App.Runtime.linux-arm64 HIGH fixed in 3.1.6
NuGet Microsoft.NETCore.App.Runtime.linux-musl-arm64 HIGH fixed in 3.1.6
NuGet Microsoft.NETCore.App.Runtime.linux-musl-x64 HIGH fixed in 3.1.6
NuGet Microsoft.NETCore.App.Runtime.linux-x64 HIGH fixed in 3.1.6
NuGet Microsoft.NETCore.App.Runtime.osx-x64 HIGH fixed in 3.1.6
NuGet Microsoft.NETCore.App.Runtime.rhel.6-x64 HIGH fixed in 3.1.6
NuGet Microsoft.NETCore.App.Runtime.win-arm HIGH fixed in 3.1.6
NuGet Microsoft.NETCore.App.Runtime.win-arm64 HIGH fixed in 3.1.6
NuGet Microsoft.NETCore.App.Runtime.win-x64 HIGH fixed in 3.1.6
NuGet Microsoft.NETCore.App.Runtime.win-x86 HIGH fixed in 3.1.6
⚠

Public Exploits & PoCs

6
webappsMicrosoft SharePoint Server 2019 - Remote Code Execution (2)2021-07-23
webappsMicrosoft SharePoint Server 2019 - Remote Code Execution2020-08-17
pocpacketstormsecurity.com · SharePoint-DataSet-DataTable-Deserialization.htmlpacketstormsecurity.com
pocpacketstormsecurity.com · Microsoft-SharePoint-Server-2019-Remote-Code-Execution.htmlpacketstormsecurity.com
pocpacketstormsecurity.com · Microsoft-SharePoint-Server-2019-Remote-Code-Execution.htmlpacketstormsecurity.com
pocwww.exploitalert.com · view-details.html?id=35992www.exploitalert.com
◈

Detection Rules (IDS/IPS)

1
et-openET EXPLOIT .NET Framework Remote Code Execution Injection (CVE-2020-1147)attempted-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
▣

Scoring & Timeline

7.8
HIGH · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD14 Jul 2020 · 11:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

8
cisaKEV-CVE-2020-1147
msrcCVE-2020-1147Remote Code Execution
rhsaRHSA-2020:2938Critical
rhsaRHSA-2020:2939Critical
rhsaRHSA-2020:2937Critical
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1147PatchVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-1147US Government Resource
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