CVE-2021-31173

Name: CVE-2021-31173
Creator: NVD / NIST
Published: 2021-05-11T19:15:09.56+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 2.08%

Last modified Jun 17, 2026

CVE-2021-31173 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Microsoft SharePoint Server Information Disclosure Vulnerability. EPSS estimates a 2.08% chance of exploitation in the next 30 days.

Description

Microsoft SharePoint Server Information Disclosure Vulnerability

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

2.08%

79.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions	Update
Microsoft	Sharepoint Foundation	2013	Sp1
Microsoft	Sharepoint Server	2016	—
Microsoft	Sharepoint Server	2019	—

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31173Patch, Vendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31173Patch, Vendor Advisory

Timeline

Published: May 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31173?

Microsoft SharePoint Server Information Disclosure Vulnerability

How severe is CVE-2021-31173?

CVE-2021-31173 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 2.08% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31173?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-31173?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST