---
id: CVE-2021-34517
title: Microsoft SharePoint Server Spoofing Vulnerability
summary: Microsoft SharePoint Server Spoofing Vulnerability
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'
vendor: microsoft
product: sharepoint_foundation
affected:
  - sharepoint_foundation = 2013
  - sharepoint_server = 2013
  - sharepoint_server = 2016
  - sharepoint_server = 2019
published: '2021-07-14'
updated: '2026-08-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-34517'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34517'
    label: secure@microsoft.com
  - url: >-
      https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34517
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.0195
epssPercentile: 0.79411
ingestedAt: '2026-08-10T16:41:17.318Z'
---

## Overview

Microsoft SharePoint Server Spoofing Vulnerability

## Affected

- `sharepoint_foundation = 2013`
- `sharepoint_server = 2013`
- `sharepoint_server = 2016`
- `sharepoint_server = 2019`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.