---
id: CVE-2021-34470
title: Microsoft Exchange Server Elevation of Privilege Vulnerability
summary: Microsoft Exchange Server Elevation of Privilege Vulnerability
severity: high
cvss: 8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
vendor: microsoft
product: exchange_server
affected:
  - exchange_server = 2013
  - exchange_server = 2016
  - exchange_server = 2019
published: '2021-07-14'
updated: '2026-08-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-34470'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34470'
    label: secure@microsoft.com
  - url: >-
      http://packetstormsecurity.com/files/163706/Microsoft-Exchange-AD-Schema-Misconfiguration-Privilege-Escalation.html
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34470
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - exploit-available
epss: 0.04379
epssPercentile: 0.9093
ingestedAt: '2026-08-10T16:41:16.152Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/technion/CVE-2021-34470scanner'
  checkedAt: '2026-09-26T09:05:26.720Z'
exploitAvailable: true
---

## Overview

Microsoft Exchange Server Elevation of Privilege Vulnerability

## Affected

- `exchange_server = 2013`
- `exchange_server = 2016`
- `exchange_server = 2019`

## Remediation

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