ExploitedIn CISA KEVFix available

CVE-2020-1147

Exploitation confirmed. First attested on 2021-11-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

Published2020-07-14

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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'.

Timeline

dates in UTC

2020-07-1423:15CVE publishedNVD
2020-08-17Exploit-DB entryExploit-DB
2021-11-03Added to the CISA KEV catalogCISA KEV
2021-11-03Listed as exploited by GCVEGCVE
2021-11-03Exploitation first reportedCISA KEV
2025-02-0419:25SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-1147?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-1147?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Microsoft .net frameworkversion to verify

Branch	Affected	Fixed in	Source
2.0	= 2.0	no fix published	NVD
3.0	= 3.0	no fix published	NVD
3.5	= 3.5	no fix published	NVD
4.6	= 4.6.2	no fix published	NVD
4.7	= 4.7	no fix published	NVD
4.7	= 4.7.1	no fix published	NVD
4.7	= 4.7.2	no fix published	NVD
4.6	= 4.6	no fix published	NVD
4.6	= 4.6.1	no fix published	NVD
4.8	= 4.8	no fix published	NVD
3.5	= 3.5.1	no fix published	NVD
4.5	= 4.5.2	no fix published	NVD

Microsoft .net core

Branch	Affected	Fixed in	Source
2.1	= 2.1	no fix published	NVD
3.1	= 3.1	no fix published	NVD

Microsoft sharepoint enterprise server

Branch	Affected	Fixed in	Source
2013.x	= 2013	no fix published	NVD
2016.x	= 2016	no fix published	NVD

15 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA68 products

As microsoft, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

Microsoft SharePoint Enterprise Server
Affected
- = 2016no fix stated
- = 2013 Service Pack 1no fix stated
Microsoft SharePoint Server
Affected
- = 2019no fix stated
- = 2010 Service Pack 2no fix stated
Microsoft Visual Studio 2019
Affected
- = 16.0no fix stated
Microsoft Visual Studio 2019 version 16.6 (includes 16.0 - 16.5)
Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)
Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)

62 more products in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of Use CVE recordupdated 2021-07-23

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

dotnetRed Hat:rhel_eus:8.1::appstreamall versions · fixed in 0:2.1.516-1.el8_1and 5 other packages
dotnetRed Hat:rhel_e4s:8.0::appstreamall versions · fixed in 0:2.1.516-1.el8_0and 5 other packages
dotnetRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:2.1.516-1.el8_2and 5 other packages
dotnetRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:3.1.106-1.el8_2and 7 other packages
dotnet-hostRed Hat:rhel_e4s:8.0::appstreamall versions · fixed in 0:2.1.20-1.el8_0and 5 other packages
dotnet-hostRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:3.1.6-1.el8_2and 10 other packages
dotnet-runtime-2.1Red Hat:rhel_eus:8.1::appstreamall versions · fixed in 0:2.1.20-1.el8_1and 3 other packages
dotnet-runtime-2.1Red Hat:enterprise_linux:8::appstreamall versions · fixed in 0:2.1.20-1.el8_2and 3 other packages

5 more package ranges on OSV.dev

Vendor advisories

CVE-2020-1147 Red Hat Product Security121 products fixed
dotnet: XML source markup processing remote code execution
RHSA-2020:2989 Red Hat Product Security13 products fixed
Red Hat Security Advisory: .NET Core security update
RHSA-2020:2988 Red Hat Product Security10 products fixed
Red Hat Security Advisory: .NET Core security and bugfix update
RHSA-2020:2954 Red Hat Product Security19 products fixed
Red Hat Security Advisory: .NET Core 3.1 security and bugfix update
RHSA-2020:2938 Red Hat Product Security10 products fixed
Red Hat Security Advisory: .NET Core security and bugfix update
RHSA-2020:2939 Red Hat Product Security39 products fixed
Red Hat Security Advisory: .NET Core 3.1 on Red Hat Enterprise Linux security and bugfix update

1 more advisory

Full record on NVD

Fix

CISA’s required action: Apply updates per vendor instructions.due 2022-05-03
Vendor fix Red Hat Product Security RHSA-2020:2989 · 13 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258

Advisories and patches

portal.msrc.microsoft.comPatch · Vendor Advisory

Detection

read 2026-11-03 22:42 UTC

Nuclei template: none so far
Exploit-DB: EDB-48747 EDB-50151
Proof-of-concept repositories: none listed
Metasploit modules: 1 moduleexploit/windows/http/sharepoint_data_deserializationrank: excellentModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.

CISA Known Exploited Vulnerability

Date Added: 2021-11-03
Patch Due Date: 2022-05-03
Ransomware Use: Unknown
Required Action: Apply updates per vendor instructions.

Sources

CISA KEVKEV entry2021-11-03
ENISA EUVDexploitation2021-11-032021-11-03
GCVEexploitation2021-11-03
CISA-ADPSSVC decisionactive2025-02-04
OpenCVESSVC decisionactive—
CISA-ADPCVSS 3.17.82025-02-04
NVDCVSS 3.17.8read 2026-10-23
NVDCVSS 2.06.8read 2026-10-23
FIRST EPSSEPSS score95.8 %read 2026-11-03
Exploit-DBdetectionread 2026-11-03
Metasploit FrameworkMetasploit modules1known since 2026-11-01
OSVaffected packages—
GitHub AdvisoriesadvisoryHIGH2022-10-21

Identifiers

EUVD-2022-3898same flawENISA EUVD · LicenseRef-ENISA-legal-notice
GHSA-g5vf-38cp-4px9same flawGitHub Advisory Database · CC-BY-4.0
RHSA-2020:2937advisory covering several CVEsRed Hat · CC-BY-4.0
RHSA-2020:2938advisory covering several CVEsRed Hat · CC-BY-4.0
RHSA-2020:2939advisory covering several CVEsRed Hat · CC-BY-4.0
RHSA-2020:2954advisory covering several CVEsRed Hat · CC-BY-4.0
RHSA-2020:2988advisory covering several CVEsRed Hat · CC-BY-4.0
RHSA-2020:2989advisory covering several CVEsRed Hat · CC-BY-4.0

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: 2020-07-14
Last Modified: 2026-06-17
NVD status: Analyzed
GitHub Advisory: GHSA-g5vf-38cp-4px9

Frequently asked questions

What is CVE-2020-1147?

Is CVE-2020-1147 actively exploited?

Yes. CVE-2020-1147 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-05-03.

What is the CVSS score for CVE-2020-1147?

CVE-2020-1147 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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Back to CVE Database

Sources for this record

CISA KEV · CC0-1.0 (cisagov/kev-data)
CVE Program · CVE Program Terms of Use
ENISA EU Vulnerability Database · ENISA legal notice §1.2 (reproduction authorised, provided the source is acknowledged)
Exploit-DB · Exploit-DB terms of service · terms restrict redistribution
FIRST EPSS · EPSS terms of use (free use, attribution requested)
GCVE · GCVE dump terms (preserve source attribution)
GitHub Advisory Database · CC-BY-4.0 · GHSA-g5vf-38cp-4px9
Metasploit Framework · BSD-3-Clause
NVD · Public domain (17 U.S.C. § 105) for NVD-authored data; third-party content under its own terms
OpenCVE · OpenCVE terms of service · terms restrict redistribution
OSV.dev · Per record, as its publisher states it: each row carries the label in sourceLicense when one is served
Red Hat Product Security (CSAF and VEX) · CC-BY-4.0
CISA Vulnrichment · CC0-1.0

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