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CVE-2021-27052: Microsoft SharePoint Server Information Disclosure Vulnerability

• Severity: medium (CVSS 4.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-11 · updated 2026-08-19

Description

Microsoft SharePoint Server Information Disclosure Vulnerability

Affected products

• Microsoft SharePoint Server: 2016
• Microsoft SharePoint Server: 2019
• Microsoft Sharepoint Enterprise Server 2016: from 16.0.0 before 16.0.5134.1000 — fixed in 16.0.5134.1000
• Microsoft SharePoint Server: from 16.0.0 before 16.0.10372.20000 — fixed in 16.0.10372.20000

How to fix

Upgrade to a fixed version: Microsoft Sharepoint Enterprise Server 2016 16.0.5134.1000; Microsoft SharePoint Server 16.0.10372.20000. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-27052
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-27052

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