CVE-2020-1147
HighExploitedPublic exploit.NET Framework, SharePoint Server, and Visual Studio Remote Code Execution Vulnerability
Published May 24, 2022 · Updated Jul 8, 2026 · Also known as GHSA-g5vf-38cp-4px9
Key Facts
Patch immediately- CVE-2020-1147 is a high-severity vulnerability (CVSS 7.8 v3.1) affecting .NET Core (Microsoft), .net Framework (Microsoft), Sharepoint Enterprise Server (Microsoft) and 22 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 3, 2021. Public exploit code is available.
- EPSS estimates a 94% probability of exploitation in the next 30 days.
- Fixed versions are available, including aspnetcore-runtime-3.1 3.1.6-1.0.1.el8_2, aspnetcore-targeting-pack-3.1 3.1.6-1.0.1.el8_2, dotnet 0:2.1.516-1.el8_0.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
94%
Higher than 99.8% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2020-1147 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
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'.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Nov 3, 2021 | May 3, 2022 | Not reported |
| Industry KEV feed | Nov 3, 2021 | May 3, 2022 | Not reported |
| CIRCL KEV | Nov 3, 2021 | May 3, 2022 | Not reported |
| ENISA EUVD | Nov 3, 2021 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
122 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| .NET CoreMicrosoft | 2.1, 3.1, >= 2.1 | n/a |
| .net FrameworkMicrosoft | 2.0-sp2, 3.0-sp2, 3.5, 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2 | n/a |
| Sharepoint Enterprise ServerMicrosoft | 2013-sp1, 2016, >= 2016 | n/a |
| Sharepoint ServerMicrosoft | 2010-sp2, 2019, >= 2019 | n/a |
| Visual Studio 2017Microsoft | See advisory | 15.9 |
Patched Releases
aspnetcore-runtime-3.1
3.1.6-1.0.1.el8_2
aspnetcore-targeting-pack-3.1
3.1.6-1.0.1.el8_2
dotnet
0:2.1.516-1.el8_0, 3.1.106-1.0.1.el8_2
dotnet-apphost-pack-3.1
3.1.6-1.0.1.el8_2
dotnet-host
3.1.6-1.0.1.el8_2
dotnet-host-fxr-2.1
2.1.20-1.el8_2
dotnet-hostfxr-3.1
3.1.6-1.0.1.el8_2
dotnet-runtime-2.1
2.1.20-1.el8_2
dotnet-runtime-3.1
3.1.6-1.0.1.el8_2
dotnet-sdk
6.0.428-1.ph4, NA
dotnet-sdk-2.1
2.1.516-1.el8_2
dotnet-sdk-2.1.5xx
2.1.516-1.el8_2
dotnet-sdk-3.1
3.1.106-1.0.1.el8_2
dotnet-targeting-pack-3.1
3.1.6-1.0.1.el8_2
dotnet-templates-3.1
3.1.106-1.0.1.el8_2
dotnet3.1
0:3.1.106-1.el8_2
Visual Studio 2017
<=15.9
Visual Studio 2019
<=16.6
Microsoft.NETCore.App
2.1.20
Microsoft.NETCore.App.Runtime.linux-arm
3.1.6
Microsoft.NETCore.App.Runtime.linux-arm64
3.1.6
Microsoft.NETCore.App.Runtime.linux-musl-arm64
3.1.6
Microsoft.NETCore.App.Runtime.linux-musl-x64
3.1.6
Microsoft.NETCore.App.Runtime.linux-x64
3.1.6
Microsoft.NETCore.App.Runtime.osx-x64
3.1.6
Timeline
Added to CISA KEV
Nov 3, 2021
Added to Industry KEV feed
Nov 3, 2021
Added to CIRCL KEV
Nov 3, 2021
Added to ENISA EUVD
Nov 3, 2021
Publicly disclosed
May 24, 2022
Last updated
Jul 8, 2026
Weakness Type
- CWE-502 Deserialization of Untrusted Data
References
- advisoryRHSA-2020:2937
- advisoryRHSA-2020:2938
- advisoryRHSA-2020:2939
- advisoryRHSA-2020:2954
- advisoryRHSA-2020:2988
FAQ
Common Questions.
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'.
Affected: .NET Core (Microsoft) versions 2.1, 3.1, >= 2.1; .net Framework (Microsoft) versions 2.0-sp2, 3.0-sp2, 3.5, 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2; Sharepoint Enterprise Server (Microsoft) versions 2013-sp1, 2016, >= 2016, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 3, 2021.
Yes. It was added on Nov 3, 2021 with a federal remediation due date of May 3, 2022.
Public exploit code is available.
Fixed versions are available, including aspnetcore-runtime-3.1 3.1.6-1.0.1.el8_2, aspnetcore-targeting-pack-3.1 3.1.6-1.0.1.el8_2, dotnet 0:2.1.516-1.el8_0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2020-1147 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo