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NVD / CVE Program· CNA microsoft

CVE-2020-1147: A remote code execution vulnerability exists in .NET Framework, Microsoft SharePoint, and Visual Studio when the software fails to check the

Noroxi assessment

Priority: Now (action score 90/100)

  • CISA has confirmed exploitation in the wild (Nov 3, 2021). Remediation deadline for US federal agencies: May 3, 2022.
  • A ready-made attack module is public (Metasploit); exploiting it takes no special expertise.
  • Probability of exploitation in the next 30 days: 95.8% (FIRST EPSS); higher than 99.8% of all records.
  • Someone with local access to the system can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: Microsoft.NETCore.App (NuGet) 2.1.20; Microsoft.NETCore.App.Runtime.linux-arm (NuGet) 3.1.6; Microsoft.NETCore.App.Runtime.linux-arm64 (NuGet) 3.1.6.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Patch today or shut off access. Upgrade to Microsoft.NETCore.App (NuGet) 2.1.20; Microsoft.NETCore.App.Runtime.linux-arm (NuGet) 3.1.6; Microsoft.NETCore.App.Runtime.linux-arm64 (NuGet) 3.1.6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

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'.

HighCVSS 7.8 · v3.1KEVWeaponized Fix available
Published
Jul 14, 2020
Updated
Jun 16, 2026
EPSS
95.8% · 99th percentile
CWE
—

Report tools

JSON

Action score

90

Now

Patch today or shut off access.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
30 / 30 · Listed
EPSS
29 / 30 · 95.8%

CISA SSVC decision

Exploitation
active
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Nov 3, 2021. That signals real attacks, not theory.

Remediation deadline for US federal agencies: May 3, 2022.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2020-1147

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
microsoft.net core
microsoft.net framework
microsoftwindows server 2008
microsoftwindows 8.1
microsoftwindows server 2012
microsoftwindows 10
microsoftwindows server 2016
microsoftwindows server 2019
microsoftwindows 7
microsoftwindows rt 8.1
microsoftsharepoint enterprise server
microsoftsharepoint server

and 2 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft .net core2.1
  • microsoft .net core3.1
  • microsoft .net framework2.0
  • microsoft .net framework3.0
  • microsoft .net framework3.5
  • microsoft .net framework3.5.1
  • microsoft .net framework4.5.2
  • microsoft .net framework4.6
  • microsoft .net framework4.6.1
  • microsoft .net framework4.6.2
  • microsoft .net framework4.7
  • microsoft .net framework4.7.1
  • microsoft .net framework4.7.2
  • microsoft .net framework4.8
  • microsoft sharepoint enterprise server2013
  • microsoft sharepoint enterprise server2016
  • microsoft sharepoint server2010
  • microsoft sharepoint server2019
  • microsoft visual studio 201715.0 and later · up to 15.9 inclusive
  • microsoft visual studio 201916.0 and later · up to 16.6 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft .NET Core

    • 2.1, 3.1affected

  • Microsoft Microsoft .NET Framework 2.0

    • Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2, Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2affected

  • Microsoft Microsoft .NET Framework 3.0

    • Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2, Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2affected

  • Microsoft Microsoft .NET Framework 3.5

    • 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)affected

  • Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for 32-bit Systems

    • unspecifiedaffected

  • Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 Version 1607 for x64-based Systems

    • unspecifiedaffected

  • Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016

    • unspecifiedaffected

  • Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 (Server Core installation)

    • unspecifiedaffected

  • Microsoft Microsoft .NET Framework 3.5 AND 4.6/4.6.1/4.6.2 on Windows 10 for 32-bit Systems

    • unspecifiedaffected

  • Microsoft Microsoft .NET Framework 3.5 AND 4.6/4.6.1/4.6.2 on Windows 10 for x64-based Systems

    • unspecifiedaffected

  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for 32-bit Systems

    • unspecifiedaffected

  • Microsoft Microsoft .NET Framework 3.5 AND 4.7.1/4.7.2 on Windows 10 Version 1709 for ARM64-based Systems

    • unspecifiedaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
NuGetMicrosoft.NETCore.Appfrom 2.1.0 · before 2.1.202.1.20
NuGetMicrosoft.NETCore.App.Runtime.linux-armfrom 3.1.0 · before 3.1.63.1.6
NuGetMicrosoft.NETCore.App.Runtime.linux-arm64from 3.1.0 · before 3.1.63.1.6
NuGetMicrosoft.NETCore.App.Runtime.linux-musl-arm64from 3.1.0 · before 3.1.63.1.6
NuGetMicrosoft.NETCore.App.Runtime.linux-musl-x64from 3.1.0 · before 3.1.63.1.6
NuGetMicrosoft.NETCore.App.Runtime.linux-x64from 3.1.0 · before 3.1.63.1.6
NuGetMicrosoft.NETCore.App.Runtime.osx-x64from 3.1.0 · before 3.1.63.1.6
NuGetMicrosoft.NETCore.App.Runtime.rhel.6-x64from 3.1.0 · before 3.1.63.1.6
NuGetMicrosoft.NETCore.App.Runtime.win-armfrom 3.1.0 · before 3.1.63.1.6
NuGetMicrosoft.NETCore.App.Runtime.win-arm64from 3.1.0 · before 3.1.63.1.6
NuGetMicrosoft.NETCore.App.Runtime.win-x64from 3.1.0 · before 3.1.63.1.6
NuGetMicrosoft.NETCore.App.Runtime.win-x86from 3.1.0 · before 3.1.63.1.6
Red Hat:enterprise_linux:8::appstreamaspnetcore-runtime-3.1before 0:3.1.6-1.el8_20:3.1.6-1.el8_2
Red Hat:enterprise_linux:8::appstreamaspnetcore-targeting-pack-3.1before 0:3.1.6-1.el8_20:3.1.6-1.el8_2
Red Hat:enterprise_linux:8::appstreamdotnetbefore 0:2.1.516-1.el8_20:2.1.516-1.el8_2
Red Hat:enterprise_linux:8::appstreamdotnetbefore 0:3.1.106-1.el8_20:3.1.106-1.el8_2
Red Hat:enterprise_linux:8::appstreamdotnet-apphost-pack-3.1before 0:3.1.6-1.el8_20:3.1.6-1.el8_2
Red Hat:enterprise_linux:8::appstreamdotnet-apphost-pack-3.1-debuginfobefore 0:3.1.6-1.el8_20:3.1.6-1.el8_2
Red Hat:enterprise_linux:8::appstreamdotnet-debuginfobefore 0:2.1.516-1.el8_20:2.1.516-1.el8_2
Red Hat:enterprise_linux:8::appstreamdotnet-debugsourcebefore 0:2.1.516-1.el8_20:2.1.516-1.el8_2
Red Hat:enterprise_linux:8::appstreamdotnet-hostbefore 0:3.1.6-1.el8_20:3.1.6-1.el8_2
Red Hat:enterprise_linux:8::appstreamdotnet-host-debuginfobefore 0:3.1.6-1.el8_20:3.1.6-1.el8_2
Red Hat:enterprise_linux:8::appstreamdotnet-host-fxr-2.1before 0:2.1.20-1.el8_20:2.1.20-1.el8_2
Red Hat:enterprise_linux:8::appstreamdotnet-host-fxr-2.1-debuginfobefore 0:2.1.20-1.el8_20:2.1.20-1.el8_2

+59

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

  • CVE-2018-0764Microsoft .NET Framework 1.1, 2.0, 3.0, 3.5, 3.5.1, 4, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2 and 5.7 and .NET Core 1.0.
    33Monitor
  • CVE-2019-1301A denial of service vulnerability exists when .NET Core improperly handles web requests, aka '.NET Core Denial of Service Vulnerability'.
    32Monitor
  • CVE-2019-0820A denial of service vulnerability exists when .NET Framework and .NET Core improperly process RegEx strings, aka '.NET Framework and .NET Co
    32Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2019-0657Mar 5, 2019 · A vulnerability exists in certain .Net Framework API's and Visual Studio in the way they parse URL's, aka '.NET Framework and Visual Studio
    24Monitor
  • ← EarlierCVE-2019-0980May 16, 2019 · A denial of service vulnerability exists when .NET Framework or .NET Core improperly handle web requests, aka '.Net Framework and .Net Core
    31Monitor
  • ← EarlierCVE-2019-0981May 16, 2019 · A denial of service vulnerability exists when .NET Framework or .NET Core improperly handle web requests, aka '.Net Framework and .Net Core
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
NuGet:Microsoft.NETCore.App2.1.20Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.linux-arm3.1.6Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.linux-arm643.1.6Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.linux-musl-arm643.1.6Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.linux-musl-x643.1.6Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.linux-x643.1.6Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.osx-x643.1.6Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.rhel.6-x643.1.6Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.win-arm3.1.6Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.win-arm643.1.6Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.win-x643.1.6Package registry (OSV)
NuGet:Microsoft.NETCore.App.Runtime.win-x863.1.6Package registry (OSV)
red hat:dotnet0:2.1.516-1.el8_2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:dotnet-debuginfo0:2.1.516-1.el8_2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:dotnet-debugsource0:2.1.516-1.el8_2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:dotnet-host-fxr-2.10:2.1.20-1.el8_2 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:rh-dotnet210:2.1-19.el7 · Red Hat:rhel_dotnet:2.1::el7Package registry (OSV)
red hat:rh-dotnet21-dotnet0:2.1.516-1.el7 · Red Hat:rhel_dotnet:2.1::el7Package registry (OSV)
red hat:rh-dotnet21-dotnet-debuginfo0:2.1.516-1.el7 · Red Hat:rhel_dotnet:2.1::el7Package registry (OSV)
red hat:rh-dotnet21-dotnet-host0:2.1.20-1.el7 · Red Hat:rhel_dotnet:2.1::el7Package registry (OSV)
red hat:rh-dotnet21-dotnet-runtime-2.10:2.1.20-1.el7 · Red Hat:rhel_dotnet:2.1::el7Package registry (OSV)
red hat:rh-dotnet21-dotnet-sdk-2.10:2.1.516-1.el7 · Red Hat:rhel_dotnet:2.1::el7Package registry (OSV)
red hat:rh-dotnet21-dotnet-sdk-2.1.5xx0:2.1.516-1.el7 · Red Hat:rhel_dotnet:2.1::el7Package registry (OSV)
red hat:rh-dotnet21-runtime0:2.1-19.el7 · Red Hat:rhel_dotnet:2.1::el7Package registry (OSV)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Metasploit module ×1
  • Exploit-DB entry ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Metasploit moduleexploit/windows/http/sharepoint_data_deserializationSharePoint DataSet / DataTable Deserializationexploit2020-07-14
Exploit-DB entrywebapps2020-08-17
Exploit-DB entrywebapps2021-07-23

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Metasploit-1 d
  2. Published
  3. First PoC+33 d
  4. CISA KEV+476 d
  5. TodayNov 5, 2026+2305 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records