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Full vulnerability report · 2020
CVE-2020-1147High confidence

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

Microsoft · .NET Framework, SharePoint, Visual Studio

7.8HighCVSS 3.1
Recommended action
Patch now

CISA confirms exploitation in the wild and lists 2022-05-03 as the remediation due date.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:Critical, raised one band.upgradedsince 3 Nov 2021

Evidence used

  • CISA confirms exploitation in the wild.
  • A structured source references public exploit or proof-of-concept material.
  • EPSS is 93.97% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Microsoft .NET Framework, SharePoint, Visual Studio and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Open-source package ranges24 source-attributed ranges

These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.

Ecosystem and packageAffected rangeFirst fixed versionEvidence
NuGetMicrosoft.NETCore.AppECOSYSTEM: introduced 2.1.0; fixed 2.1.202.1.20OSV record ↗aggregator derived · 22 Oct 2025
NuGetMicrosoft.NETCore.App.Runtime.linux-armECOSYSTEM: introduced 3.1.0; fixed 3.1.63.1.6OSV record ↗aggregator derived · 22 Oct 2025
NuGetMicrosoft.NETCore.App.Runtime.linux-arm64ECOSYSTEM: introduced 3.1.0; fixed 3.1.63.1.6OSV record ↗aggregator derived · 22 Oct 2025
NuGetMicrosoft.NETCore.App.Runtime.linux-musl-arm64ECOSYSTEM: introduced 3.1.0; fixed 3.1.63.1.6OSV record ↗aggregator derived · 22 Oct 2025
NuGetMicrosoft.NETCore.App.Runtime.linux-musl-x64ECOSYSTEM: introduced 3.1.0; fixed 3.1.63.1.6OSV record ↗aggregator derived · 22 Oct 2025
NuGetMicrosoft.NETCore.App.Runtime.linux-x64ECOSYSTEM: introduced 3.1.0; fixed 3.1.63.1.6OSV record ↗aggregator derived · 22 Oct 2025
NuGetMicrosoft.NETCore.App.Runtime.osx-x64ECOSYSTEM: introduced 3.1.0; fixed 3.1.63.1.6OSV record ↗aggregator derived · 22 Oct 2025
NuGetMicrosoft.NETCore.App.Runtime.rhel.6-x64ECOSYSTEM: introduced 3.1.0; fixed 3.1.63.1.6OSV record ↗aggregator derived · 22 Oct 2025
NuGetMicrosoft.NETCore.App.Runtime.win-armECOSYSTEM: introduced 3.1.0; fixed 3.1.63.1.6OSV record ↗aggregator derived · 22 Oct 2025
NuGetMicrosoft.NETCore.App.Runtime.win-arm64ECOSYSTEM: introduced 3.1.0; fixed 3.1.63.1.6OSV record ↗aggregator derived · 22 Oct 2025
NuGetMicrosoft.NETCore.App.Runtime.win-x64ECOSYSTEM: introduced 3.1.0; fixed 3.1.63.1.6OSV record ↗aggregator derived · 22 Oct 2025
NuGetMicrosoft.NETCore.App.Runtime.win-x86ECOSYSTEM: introduced 3.1.0; fixed 3.1.63.1.6OSV record ↗aggregator derived · 22 Oct 2025
nugetMicrosoft.NETCore.App>= 2.1.0, < 2.1.202.1.20GitHub advisory ↗github reviewed aggregator · 22 Oct 2025
nugetMicrosoft.NETCore.App.Runtime.linux-arm>= 3.1.0, < 3.1.63.1.6GitHub advisory ↗github reviewed aggregator · 22 Oct 2025
nugetMicrosoft.NETCore.App.Runtime.linux-arm64>= 3.1.0, < 3.1.63.1.6GitHub advisory ↗github reviewed aggregator · 22 Oct 2025
nugetMicrosoft.NETCore.App.Runtime.linux-musl-arm64>= 3.1.0, < 3.1.63.1.6GitHub advisory ↗github reviewed aggregator · 22 Oct 2025
nugetMicrosoft.NETCore.App.Runtime.linux-musl-x64>= 3.1.0, < 3.1.63.1.6GitHub advisory ↗github reviewed aggregator · 22 Oct 2025
nugetMicrosoft.NETCore.App.Runtime.linux-x64>= 3.1.0, < 3.1.63.1.6GitHub advisory ↗github reviewed aggregator · 22 Oct 2025
nugetMicrosoft.NETCore.App.Runtime.osx-x64>= 3.1.0, < 3.1.63.1.6GitHub advisory ↗github reviewed aggregator · 22 Oct 2025
nugetMicrosoft.NETCore.App.Runtime.rhel.6-x64>= 3.1.0, < 3.1.63.1.6GitHub advisory ↗github reviewed aggregator · 22 Oct 2025
nugetMicrosoft.NETCore.App.Runtime.win-arm>= 3.1.0, < 3.1.63.1.6GitHub advisory ↗github reviewed aggregator · 22 Oct 2025
nugetMicrosoft.NETCore.App.Runtime.win-arm64>= 3.1.0, < 3.1.63.1.6GitHub advisory ↗github reviewed aggregator · 22 Oct 2025
nugetMicrosoft.NETCore.App.Runtime.win-x64>= 3.1.0, < 3.1.63.1.6GitHub advisory ↗github reviewed aggregator · 22 Oct 2025
nugetMicrosoft.NETCore.App.Runtime.win-x86>= 3.1.0, < 3.1.63.1.6GitHub advisory ↗github reviewed aggregator · 22 Oct 2025
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2022-3898

CISA KEV mirrored by ENISA

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'.

EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 3 Nov 2021. Evidence sources: cisa_kev.
ENISA score
7.8 · CVSS 3.1
Advisory evidence
6 linked advisory records
Explicit mitigation evidence

Only statements that explicitly mention a fix, patch, update, workaround or mitigation are shown here.

  • csaf_redhat · RHSA-2020:2988Red Hat Security Advisory: .NET Core security and bugfix update
  • csaf_redhat · RHSA-2020:2939Red Hat Security Advisory: .NET Core 3.1 on Red Hat Enterprise Linux security and bugfix update
  • csaf_redhat · RHSA-2020:2954Red Hat Security Advisory: .NET Core 3.1 security and bugfix update
  • csaf_redhat · RHSA-2020:2937Red Hat Security Advisory: .NET Core 2.1 on Red Hat Enterprise Linux security and bugfix update
  • csaf_redhat · RHSA-2020:2989Red Hat Security Advisory: .NET Core security update
  • csaf_redhat · RHSA-2020:2938Red Hat Security Advisory: .NET Core security and bugfix update
Recommended actionPatch now

CISA confirms exploitation in the wild and lists 2022-05-03 as the remediation due date.

Patch available
01

What, why and how

Microsoft .NET Framework, Microsoft SharePoint, and Visual Studio contain a remote code execution vulnerability when the software fails to check the source markup of XML file input. Successful exploitation allows an attacker to execute code in the context of the process responsible for deserialization of the XML content.

What

Microsoft .NET Framework, Microsoft SharePoint, and Visual Studio contain a remote code execution vulnerability when the software fails to check the source markup of XML file input. Successful exploitation allows an attacker to execute code in the context of the process responsible for deserialization of the XML content.

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through local access may attempt exploitation without authentication after a user interaction. If successful, the issue may execute code or commands in the affected security context.

What

Microsoft .NET Framework, Microsoft SharePoint, and Visual Studio contain a remote code execution vulnerability when the software fails to check the source markup of XML file input. Successful exploitation allows an attacker to execute code in the context of the process responsible for deserialization of the XML content.

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through local access may attempt exploitation without authentication after a user interaction. If successful, the issue may execute code or commands in the affected security context.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2021-11-03.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
local access → vulnerable operation → execute code or commands in the affected security context
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
Required interaction required
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration.
CWE not yet assigned
CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UIRequiredUser interaction: Another user must perform an action for exploitation to succeed.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
After compromise, an attacker may use built-in shells, scripting engines, scheduled tasks and native network utilities for discovery, persistence or movement. This is a plausible LoTL path, not evidence that it has occurred for every attack.
UnauthenticatedRemote code executionCISA KEVPublic exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2022-3898Known-exploited evidence recorded

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'.

Official EUVD record ↗
Cyber Security Agency of Singapore · English · CSA-SB-20200715Security Bulletin 15 Jul 2020

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 15 Jul 2020, published on 15 July 2020. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-451Vulnérabilité dans Red Hat .NET Core

Une vulnérabilité a été découverte dans Red Hat .NET Core. Elle permet à un attaquant de provoquer une exécution de code arbitraire à distance.

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-431Multiples vulnérabilités dans les produits Microsoft

De multiples vulnérabilités ont été corrigées dans les produits Microsoft . Elles permettent à un attaquant de provoquer une atteinte à la confidentialité des données, une exécution de code à distance, une usurpation d'identité, un déni de service et une élévation de privilèges.

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-430Vulnérabilité dans Microsoft .Net

Une vulnérabilité a été corrigée dans Microsoft .Net . Elle permet à un attaquant de provoquer une exécution de code à distance.

Official advisory ↗
CERT-FR · French · CERTFR-2020-AVI-428Multiples vulnérabilités dans Microsoft Office

De multiples vulnérabilités ont été corrigées dans Microsoft Office . Elles permettent à un attaquant de provoquer une atteinte à la confidentialité des données, une élévation de privilèges, une exécution de code à distance et une usurpation d'identité.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2020-008157複数の Microsoft 製品におけるリモートでコードを実行される脆弱性

複数の Microsoft 製品には、.NET Framework、Microsoft SharePoint および Visual Studio がXML ファイル入力のソース マークアップをチェックできない場合、リモートでコードを実行される脆弱性が存在します。 ベンダは、本脆弱性を「NET Framework、SharePoint Server および Visual Studio のリモートでコードが実行される脆弱性」として公開しています。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-5171MS 7월 보안 위협에 따른 정기 보안 업데이트 권고

영향받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 5. Microsoft Office 관련 소프트웨어 보안 업데이트 ##### □ 설명 o 공격자가 특수하게 제작된 악성 응용 프로그램을 실행할 경우, 원격코드실행을 허용하는 취약점 o 관련취약점 : - 원격코드실행 취약점(CVE-2020-1349, CVE-2020-1409, CVE-2020-1446, CVE-2020-1447, CVE-2020-1448, CVE-2020-1449) - 스푸핑 취약점(CVE-2020-1442) - 정보노출 취약점(CVE-2020-1342, CVE-2020-1445) o 영향 : 원격코드실행 o 중요도 : 긴급 o 관련 KB번호 - 4484357, 4484363, 4484381, 4484382, 4484433, 4484438, 4484441, 4484446, 4484450, 4484451, 4484456, 4484458, 4484463 ##### □ 해결책 o 영향받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 6. Microsoft SharePoint 관련 소프트웨어 보안 업데이트 ##### □ 설명 o 공격자가 특수하게 제작된 악성 응용 프로그램을 실행할 경우 발생하는 원격코드 취약점 o 관련취약점 : - 원격코드실행 취약점(CVE-2020-1147, CVE-2020-1439, CVE-2020-1444, CVE-2020-1446, CVE-2020-1447, CVE-2020-1448) - 권한상승 취약점(CVE-2020-1025) - 스푸핑 취약점(CVE-2020-1443, CVE-2020-1450, CVE-2020-1451, CVE-2020-1454, CVE-2020-1456) - 정보노출 취약점(CVE-2020-1342, CVE-2020-1445) o 영향 : 원격코드실행 o 중요도 : 긴급 o 관련 KB번호 - 4484348, 4484353, 4484370, 4484374, 4484411, 4484436, 4484440, 4484443, 4484448, 4484451, 4484452, 4484453, 4484460 ##### □ 해결책 o 영향받는 소프트웨어를 이용하는 경우 마이크로소프트사의 보안 패치 적용 7. Lync Server 및 비즈니스용 Skype 소프트웨어 보안 업데이트 ##### □ 설명 o 공격자가 특수하게 제작된 악성 응용 프로그램을 실행할 경우 발생하는 권한상승 취약점 o 관련취약점 : - 권한상승 취약점(CVE-2020-1025) o 영향 : 권한상승 o 중요도 : 긴급 o 관련 KB번호 - 4571332, 4571333, 4571334 ##### □ 해결책 o 영

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 14 Jul 2020 · Last source change 21 Oct 2025, 23:35 UTC · CWE not yet assigned

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2022-3898
Product sourceCISA KEV
Remediation sourceCVE/CNA references
CWE sourceUnavailable
NVD statusNVD enriched

Missing structured fields: CWE classification. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    2016; 2013 Service Pack 1; 2019; 2010 Service Pack 2; 16.0; unspecified; 2.1; 3.1 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    Microsoft SharePoint Enterprise Server: 2016, 2013 Service Pack 1; Microsoft SharePoint Server: 2019, 2010 Service Pack 2; Microsoft Visual Studio 2019: 16.0; Microsoft Visual Studio 2019 version 16.6 (includes 16.0 - 16.5): unspecified; Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8): unspecified; Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3): unspecified; .NET Core: 2.1, 3.1; Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2: Windows 7 for 32-bit Systems Service Pack 1, Windows 7 for x64-based Systems Service Pack 1, Windows 8.1 for 32-bit systems, Windows 8.1 for x64-based systems, Windows RT 8.1, Windows Server 2008 R2 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation), Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation); Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for 32-bit Systems: unspecified; Microsoft .NET Framework 4.8 on Windows 10 Version 1803 for x64-based Systems: unspecified; Microsoft .NET Framework 4.8 on Windows Server, version 1803 (Server Core Installation): unspecified; Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for 32-bit Systems: unspecified; Microsoft .NET Framework 4.8 on Windows 10 Version 1709 for x64-based Systems: unspecified; Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems: unspecified; Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems: unspecified; Microsoft .NET Framework 4.8 on Windows Server 2016: unspecified; Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation): unspecified; Microsoft .NET Framework 4.8 on Windows 7 for 32-bit Systems Service Pack 1: unspecified; Microsoft .NET Framework 4.8 on Windows 7 for x64-based Systems Service Pack 1: unspecified; Microsoft .NET Framework 4.8 on Windows 8.1 for 32-bit systems: unspecified; Microsoft .NET Framework 4.8 on Windows 8.1 for x64-based systems: unspecified; Microsoft .NET Framework 4.8 on Windows RT 8.1: unspecified; Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1: unspecified; Microsoft .NET Framework 4.8 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation): unspecified; Microsoft .NET Framework 4.8 on Windows Server 2012: unspecified; Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation): unspecified; Microsoft .NET Framework 4.8 on Windows Server 2012 R2: unspecified; Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation): unspecified; Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems: unspecified; Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems: unspecified; Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019: unspecified; Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation): unspecified; Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for 32-bit Systems: unspecified; Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1909 for x64-based Systems: unspecified; Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1909 (Server Core installation): unspecified; Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for 32-bit Systems: unspecified; Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1903 for x64-based Systems: unspecified; Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1903 (Server Core installation): 1903; Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for 32-bit Systems: unspecified; Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1803 for x64-based Systems: unspecified; 28 additional product groups retained in the authoritative source · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Added to CISA KEV
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2022-3898↗CISA KEV record↗CVE authority or vendor reference↗Public exploit reference↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2020-1147 · cve.blacktree.nl