CVE-2020-1147 microsoft · .net core

SharePoint DataSet / DataTable Deserialization

Vulnerability at a glance

Severity, exploitation likelihood & attack requirements

CVSS v3.1 severity
7.8High
EPSS · exploitation likelihood
93.966% Probability within 30 daysPercentile 99.8
EPSS trend
Unchanged Since 2026-10-14
Known exploitation
Known exploited CISA KEV catalog
Attack vector
LocalLocal execution or access
Attack complexity
LowFewer obstacles to exploitation
Privileges required
NoneNo authentication required
User interaction
RequiredUser action required
Exploit availability & maturity
Not scored Exploit reference available No explicit exploit maturity assessment View exploit evidence
How to read the colors & trend
Higher exposureElevatedModerateLower exposureUnknown / unassessed

CVSS colors follow its reported severity. Attack-factor colors describe each requirement, not an overall risk rating. Gray also covers absence from KEV; absence does not establish safety.

EPSS display bands: below 1% blue, 1–10% amber, 10–50% orange, 50% and above red. These are presentation bands, not FIRST severity categories. The trend compares daily EPSS probabilities, not percentile ranks; “pp” means percentage points. The sparkline shows relative movement, with its vertical scale fitted to the observed scores.

Already protected by existing Atomicorp rules No new CVE-specific rule required.

Atomicorp ModSecurity protection

Protected by Atomicorp rules

Atomicorp ModSecurity rules block attacks exploiting this vulnerability when blocking is enabled. Keep your rules current.

By targeting underlying attack techniques and CWE weakness classes, existing rules can protect against newly disclosed vulnerabilities. Rule changes are regression-tested against attack and false-positive corpora.

4 rules identified Verified 2026-10-21 View rules & research details →

WAF protection applies to the tested attack paths; it does not change the CVSS or EPSS score. Keep your software patched and your Atomicorp rules current.

CISA SSVC assessment

CISA ADP · Assessed 2025-02-04 · SSVC 2.0.3

Exploitation
Active exploitation
Automatable
No
Technical Impact
Total

Stakeholder-Specific Vulnerability Categorization records CISA’s assessment of exploitation, automation, and technical impact. “None reported” reflects the assessment date; it does not establish that no exploit exists. View SSVC source details.

On this page

CVE Details

  • Protection status: Protected by Atomicorp rules · About protection statuses
  • CVE: CVE-2020-1147
  • Name: SharePoint DataSet / DataTable Deserialization
  • Severity: High
  • CVSS: 7.8 (v3.1) (High)
  • CVSS version: 3.1
  • CVSS source: NVD
  • CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
    • Attack vector: Local
    • Attack complexity: Low
    • Privileges required: None
    • User interaction: Required
    • Scope: Unchanged
    • Confidentiality impact: High
    • Integrity impact: High
    • Availability impact: High
  • CWE: N/A
  • Vendor: microsoft
  • Vulnerable products: .net core , .net framework , sharepoint enterprise server , sharepoint server , visual studio 2017 , visual studio 2019
  • CVE published: 2020-07-14
  • CVE last modified: 2026-06-17
  • Affected versions (NVD configurations):
    • .net core: 2.1
    • .net core: 3.1
    • .net framework: 2.0 SP2
    • .net framework: 3.0 SP2
    • .net framework: 3.5
    • .net framework: 4.6.2
    • .net framework: 4.7
    • .net framework: 4.7.1
    • .net framework: 4.7.2
    • .net framework: 4.6
    • .net framework: 4.6.1
    • .net framework: 4.8
    • .net framework: 3.5.1
    • .net framework: 4.5.2
    • sharepoint enterprise server: 2013 SP1
    • sharepoint enterprise server: 2016
    • sharepoint server: 2010 SP2
    • sharepoint server: 2019
    • visual studio 2017: >= 15.0, <= 15.9
    • visual studio 2019: >= 16.0, <= 16.6
  • EPSS: 0.9397; 99.8th percentile as of 2026-10-21 (FIRST )
  • CISA KEV: Listed (added 2021-11-03)
    • Known ransomware campaign use: Unknown
  • Latest Update: 2026-10-21
  • Selected Rule IDs observed: 341256 , 344370 , 344380 , 350147
  • Matching rules: 4; rules with blocking actions: 4
  • Would-block Rule IDs: 341256 , 344370 , 344380 , 350147
  • Request surfaces inspected: JSON request data, Request argument names, Request arguments, Request body, Request cookies, SOAP request data, XML request data
Technical vulnerability details · CVSS assessments, exploit evidence & CPE data

CVSS assessments

CVSS v3.1 · NVD

  • Base score: 7.8
  • Base severity: HIGH
  • Exploitability subscore: 1.8
  • Impact subscore: 5.9
  • Assessment type: Primary
  • Source identifier: nvd@nist.gov
  • Full vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
    • Attack vector: Local
    • Attack complexity: Low
    • Privileges required: None
    • User interaction: Required
    • Scope: Unchanged
    • Confidentiality impact: High
    • Integrity impact: High
    • Availability impact: High
  • Exploit maturity: Not scored

CVSS v3.1 · CISA ADP

  • Base score: 7.8
  • Base severity: HIGH
  • Exploitability subscore: 1.8
  • Impact subscore: 5.9
  • Assessment type: Secondary
  • Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  • Full vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
    • Attack vector: Local
    • Attack complexity: Low
    • Privileges required: None
    • User interaction: Required
    • Scope: Unchanged
    • Confidentiality impact: High
    • Integrity impact: High
    • Availability impact: High
  • Exploit maturity: Not scored

CVSS v2.0 · NVD

  • Base score: 6.8
  • Base severity: MEDIUM
  • Exploitability subscore: 8.6
  • Impact subscore: 6.4
  • Assessment type: Primary
  • Source identifier: nvd@nist.gov
  • Full vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
    • Attack vector: Network
    • Attack complexity: Medium
    • Authentication: None
    • Confidentiality impact: Partial
    • Integrity impact: Partial
    • Availability impact: Partial
  • Exploit maturity: Not scored

Exploitability and impact subscores describe the vulnerability’s technical characteristics. Exploit maturity describes the reported state of exploitation; these are separate measures.

Assessment source: NVD record · CVE record

CISA SSVC assessments

These are CISA’s published decision points at the assessment time. They are not a complete organization-specific prioritization decision.

  • Provider: CISA ADP
  • Provider identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  • SSVC version: 2.0.3
  • Role: CISA Coordinator
  • Assessment timestamp: 2025-02-04T19:25:47.186130Z
  • Exploitation: active
  • Automatable: no
  • Technical Impact: total
  • Source: CISA ADP in the CVE record

Exploit references

The CVE source data tags these references as exploits. A reference alone does not establish reliability or active exploitation.

Vulnerable CPE configurations

  • cpe:2.3:a:microsoft:.net_core:2.1:*:*:*:*:*:*:*
    • NVD match criteria ID: 3BF7E3F6-D3AE-404D-8F0E-0C57BF23006C
  • cpe:2.3:a:microsoft:.net_core:3.1:*:*:*:*:*:*:*
    • NVD match criteria ID: 7B53B587-D639-45C0-AC33-90669934666A
  • cpe:2.3:a:microsoft:.net_framework:2.0:sp2:*:*:*:*:*:*
    • NVD match criteria ID: 42A6DF09-B8E1-414D-97E7-453566055279
  • cpe:2.3:a:microsoft:.net_framework:3.0:sp2:*:*:*:*:*:*
    • NVD match criteria ID: D400E856-2B2E-4CEA-8CA5-309FDF371CEA
  • cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:*
    • NVD match criteria ID: E039CE1F-B988-4741-AE2E-5B36E2AF9688
  • cpe:2.3:a:microsoft:.net_framework:4.6.2:*:*:*:*:*:*:*
    • NVD match criteria ID: A16AD2B0-2189-4E8E-B7FC-CE598CA1CB2D
  • cpe:2.3:a:microsoft:.net_framework:4.7:*:*:*:*:*:*:*
    • NVD match criteria ID: 734112B3-1383-4BE3-8721-C0F84566B764
  • cpe:2.3:a:microsoft:.net_framework:4.7.1:*:*:*:*:*:*:*
    • NVD match criteria ID: 36B0E40A-84EF-4099-A395-75D6B8CDA196
  • cpe:2.3:a:microsoft:.net_framework:4.7.2:*:*:*:*:*:*:*
    • NVD match criteria ID: 3EF7A75E-EE27-4AA7-8D84-9D696728A4CE
  • cpe:2.3:a:microsoft:.net_framework:4.6:*:*:*:*:*:*:*
    • NVD match criteria ID: 280FE663-23BE-45D2-9B31-5F577E390B48
  • cpe:2.3:a:microsoft:.net_framework:4.6.1:*:*:*:*:*:*:*
    • NVD match criteria ID: FF0B660D-1F30-4D45-B98B-726EDB8CB90F
  • cpe:2.3:a:microsoft:.net_framework:4.8:*:*:*:*:*:*:*
    • NVD match criteria ID: 2D3F18AF-84ED-473B-A8DF-65EB23C475AF
  • cpe:2.3:a:microsoft:.net_framework:3.5.1:*:*:*:*:*:*:*
    • NVD match criteria ID: 8EDC4407-7E92-4E60-82F0-0C87D1860D3A
  • cpe:2.3:a:microsoft:.net_framework:4.5.2:*:*:*:*:*:*:*
    • NVD match criteria ID: 40B3A045-B08A-44E0-91BE-726753F6A362
  • cpe:2.3:a:microsoft:sharepoint_enterprise_server:2013:sp1:*:*:*:*:*:*
    • NVD match criteria ID: A5D3A185-BE57-403E-914E-FDECEC3A477C
  • cpe:2.3:a:microsoft:sharepoint_enterprise_server:2016:*:*:*:*:*:*:*
    • NVD match criteria ID: 9C082CC4-6128-475D-BC19-B239E348FDB2
  • cpe:2.3:a:microsoft:sharepoint_server:2010:sp2:*:*:*:*:*:*
    • NVD match criteria ID: 9A57C675-05A9-4BC2-AE95-7CA5CA6B1F73
  • cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*
    • NVD match criteria ID: 6122D014-5BF1-4AF4-8B4D-80205ED7785E
  • cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*
    • Version start (inclusive): 15.0
    • Version end (inclusive): 15.9
    • NVD match criteria ID: CE03B37D-72FE-4C25-BE62-9C422AEFC80E
  • cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*
    • Version start (inclusive): 16.0
    • Version end (inclusive): 16.6
    • NVD match criteria ID: 65B6534A-CCBC-4576-85A1-FAE04DC2ACFB

Vulnerability 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’.

  1. Maintain the observed Atomicorp protections. Keep your Atomicorp commercial rules current and confirm that the selected observed rules (341256 , 344370 , 344380 , 350147 ) have not been locally disabled. Atomicorp commercial rules are enabled by default. If you use Atomic WAF, review the applicable policy and rule settings.

  2. Apply the vendor’s remediation. WAF protection is defense in depth and does not replace upgrading or following the affected vendor’s guidance.

    • Affected versions: Microsoft Microsoft SharePoint Enterprise Server version 2016.
    • Affected versions: Microsoft Microsoft SharePoint Enterprise Server version 2013 Service Pack 1.
    • Affected versions: Microsoft Microsoft SharePoint Server version 2019.
    • Affected versions: Microsoft Microsoft SharePoint Server version 2010 Service Pack 2.
    • Affected versions: Microsoft Microsoft Visual Studio 2019 version 16.0.
    • Affected versions: Microsoft .NET Core version 2.1.
    • Affected versions: Microsoft .NET Core version 3.1.
    • Affected versions: Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 version Windows 7 for 32-bit Systems Service Pack 1.
    • Affected versions: Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 version Windows 7 for x64-based Systems Service Pack 1.
    • Affected versions: Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 version Windows 8.1 for 32-bit systems.
    • Affected versions: Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 version Windows 8.1 for x64-based systems.
    • Affected versions: Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 version Windows RT 8.1.
    • Affected versions: Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 version Windows Server 2008 R2 for x64-based Systems Service Pack 1.
    • Affected versions: Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 version Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation).
    • Affected versions: Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 version Windows Server 2012.
    • Affected versions: Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 version Windows Server 2012 (Server Core installation).
    • Affected versions: Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 version Windows Server 2012 R2.
    • Affected versions: Microsoft Microsoft .NET Framework 4.6/4.6.1/4.6.2/4.7/4.7.1/4.7.2 version Windows Server 2012 R2 (Server Core installation).
    • Affected versions: Microsoft Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 1903 (Server Core installation) version 1903.
    • Affected versions: Microsoft Microsoft .NET Framework 4.6 version Windows Server 2008 for 32-bit Systems Service Pack 2.
    • Affected versions: Microsoft Microsoft .NET Framework 4.6 version Windows Server 2008 for x64-based Systems Service Pack 2.
    • Affected versions: Microsoft Microsoft .NET Framework 2.0 version Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2.
    • Affected versions: Microsoft Microsoft .NET Framework 2.0 version Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2.
    • Affected versions: Microsoft Microsoft .NET Framework 3.0 version Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2.
    • Affected versions: Microsoft Microsoft .NET Framework 3.0 version Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2.
    • Affected versions: Microsoft Microsoft .NET Framework 3.5 version Windows 8.1 for 32-bit systems.
    • Affected versions: Microsoft Microsoft .NET Framework 3.5 version Windows 8.1 for x64-based systems.
    • Affected versions: Microsoft Microsoft .NET Framework 3.5 version Windows Server 2012.
    • Affected versions: Microsoft Microsoft .NET Framework 3.5 version Windows Server 2012 (Server Core installation).
    • Affected versions: Microsoft Microsoft .NET Framework 3.5 version Windows Server 2012 R2.
    • Affected versions: Microsoft Microsoft .NET Framework 3.5 version Windows Server 2012 R2 (Server Core installation).
    • Affected versions: Microsoft Microsoft .NET Framework 3.5.1 version Windows 7 for 32-bit Systems Service Pack 1.
    • Affected versions: Microsoft Microsoft .NET Framework 3.5.1 version Windows 7 for x64-based Systems Service Pack 1.
    • Affected versions: Microsoft Microsoft .NET Framework 3.5.1 version Windows Server 2008 R2 for x64-based Systems Service Pack 1.
    • Affected versions: Microsoft Microsoft .NET Framework 4.5.2 version Windows 7 for 32-bit Systems Service Pack 1.
    • Affected versions: Microsoft Microsoft .NET Framework 4.5.2 version Windows 7 for x64-based Systems Service Pack 1.
    • Affected versions: Microsoft Microsoft .NET Framework 4.5.2 version Windows 8.1 for 32-bit systems.
    • Affected versions: Microsoft Microsoft .NET Framework 4.5.2 version Windows 8.1 for x64-based systems.
    • Affected versions: Microsoft Microsoft .NET Framework 4.5.2 version Windows RT 8.1.
    • Affected versions: Microsoft Microsoft .NET Framework 4.5.2 version Windows Server 2008 for 32-bit Systems Service Pack 2.
    • Affected versions: Microsoft Microsoft .NET Framework 4.5.2 version Windows Server 2008 for x64-based Systems Service Pack 2.
    • Affected versions: Microsoft Microsoft .NET Framework 4.5.2 version Windows Server 2008 R2 for x64-based Systems Service Pack 1.
    • Affected versions: Microsoft Microsoft .NET Framework 4.5.2 version Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation).
    • Affected versions: Microsoft Microsoft .NET Framework 4.5.2 version Windows Server 2012.
    • Affected versions: Microsoft Microsoft .NET Framework 4.5.2 version Windows Server 2012 (Server Core installation).
    • Affected versions: Microsoft Microsoft .NET Framework 4.5.2 version Windows Server 2012 R2.
    • Affected versions: Microsoft Microsoft .NET Framework 4.5.2 version Windows Server 2012 R2 (Server Core installation).
    • The CVE record does not include written upgrade or workaround instructions, but it does publish the following patch or mitigation reference:
    • CISA KEV required action: Apply updates per vendor instructions.
    • CISA KEV federal remediation due date: 2022-05-03

  3. Validate after changes. Confirm rule updates are current, review WAF events for the affected application, and test application behavior after vendor upgrades, mitigations, or local policy changes.

Research Notes

Atomicorp WAF protections are designed around attack techniques and exploit behaviors, allowing existing protections to apply across multiple vulnerabilities without requiring a unique rule for every CVE.

Public Vulnerability References

Test or Research Source

Research Note Context

This research note documents exploit-technique analysis associated with this vulnerability and references Atomicorp WAF protections observed during engineering review, testing, or validation activities.

Atomicorp security controls are generally designed to identify and mitigate attack techniques and exploit behaviors rather than individual CVE identifiers. As a result, protections developed for one vulnerability may also apply to related attack variants and future vulnerabilities using similar techniques.

Learn More

Atomicorp develops commercially supported security technologies for web applications, servers, endpoints, workloads, and legacy enterprise platforms.

Organizations interested in protecting systems against exploit techniques associated with vulnerabilities such as this one can learn more about:

  • Atomic ModSecurity Rules: commercially maintained WAF rules for ModSecurity deployments, including protections for web attacks, bots, scanners, malware, exploitation attempts, and emerging vulnerability classes.
  • Atomic WAF: an enterprise web application firewall with Atomicorp rules, centralized management, reporting, authentication controls, and operational tooling.
  • Atomic ModSecurity Integrator: a special licensing option for MSPs, MSSPs, OEMs, VARs, reverse proxy providers, and other integrators who want to incorporate Atomicorp ModSecurity rule technology into their own products or services.
  • Atomic OSSEC: an enterprise OSSEC-based intrusion detection, compliance, and security monitoring platform.
  • Atomic Protector: workload protection for Linux, web, cloud, data center, and hybrid environments.

For additional information, product evaluations, or technical discussions, visit https://www.atomicorp.com/ or https://modsecurity.io/ .