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TI-2021-17534 Aliases CVE-2021-40487GHSA-w9qh-f4fr-cg94

Microsoft SharePoint Server Remote Code Execution Vulnerability

Priority HIGH 71CWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-94.

Summary

Microsoft SharePoint Server Remote Code Execution Vulnerability

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.48205 98th percentileScored 2026-11-07
Fix Fixed Microsoft SharePoint Enterprise Server 2016 (Microsoft): 16.0.5227.1000Microsoft SharePoint Server 2019 (Microsoft): 16.0.10379.20000+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft SharePoint Enterprise Server 201616.0.0 to before 16.0.5227.100016.0.5227.1000Patch availableCNA
MicrosoftMicrosoft SharePoint Server 201916.0.0 to before 16.0.10379.2000016.0.10379.20000Patch availableCNA
MicrosoftMicrosoft SharePoint Foundation 2013 Service Pack 115.0.0 to before 15.0.5389.100015.0.5389.1000Patch availableCNA
  • Microsoft SharePoint Enterprise Server 2016 VendorMicrosoft Affected 16.0.0 to before 16.0.5227.1000 Fixed in 16.0.5227.1000 Patch available CNA
  • Microsoft SharePoint Server 2019 VendorMicrosoft Affected 16.0.0 to before 16.0.10379.20000 Fixed in 16.0.10379.20000 Patch available CNA
  • Microsoft SharePoint Foundation 2013 Service Pack 1 VendorMicrosoft Affected 15.0.0 to before 15.0.5389.1000 Fixed in 15.0.5389.1000 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:sharepoint_enterprise_server:2016:*:*:*:*:*:*:*2016VulnerableMicrosoft
cpe:2.3:a:microsoft:sharepoint_foundation:2013:sp1:*:*:*:*:*:*2013 sp1VulnerableMicrosoft
cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*2019VulnerableMicrosoft
  • cpe:2.3:a:microsoft:sharepoint_enterprise_server:2016:*:*:*:*:*:*:* Versions 2016 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:sharepoint_foundation:2013:sp1:*:*:*:*:*:* Versions 2013 sp1 Vulnerable ·Microsoft
  • cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:* Versions 2019 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Microsoft SharePoint Enterprise Server 2016 (Microsoft) Fixed in 16.0.5227.1000
  • Fix · CNA Microsoft SharePoint Server 2019 (Microsoft) Fixed in 16.0.10379.20000
  • Fix · CNA Microsoft SharePoint Foundation 2013 Service Pack 1 (Microsoft) Fixed in 15.0.5389.1000

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-40487
  2. 2026-10-03 Alias added: GHSA-w9qh-f4fr-cg94

References

Patch 1

Advisory 1

  • TI-2019-00394 Improper input validation in Microsoft SharePoint Server KEVCVSS 3.1CRITICAL 9.8
  • TI-2020-01112 A remote code execution vulnerability exists in .NET Framework, Microsoft SharePoint, and… KEVCVSS 3.1HIGH 7.8
  • TI-2017-08774 Memory corruption in Microsoft Office KEVCVSS 3.1HIGH 7.8
  • TI-2023-10439 Microsoft SharePoint Server Remote Code Execution Vulnerability KEVCVSS 3.1HIGH 7.2
  • TI-2023-08100 Microsoft Word Remote Code Execution Vulnerability CVSS 3.1CRITICAL 9.8
  • TI-2025-31676 Microsoft SharePoint Server Spoofing Vulnerability KEVCVSS 3.1MEDIUM 6.5
See all 255 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences