---
id: CVE-2021-31196
title: Microsoft Exchange Server Remote Code Execution Vulnerability
summary: Microsoft Exchange Server Remote Code Execution Vulnerability
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/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-2021-31196'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31196'
    label: secure@microsoft.com
  - url: >-
      https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31196
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31196
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - kev
  - in-the-wild
epss: 0.54056
epssPercentile: 0.98969
kev: true
kevDateAdded: '2024-08-21'
kevDueDate: '2024-09-11'
kevRansomware: false
exploited: true
ingestedAt: '2026-08-10T16:41:14.342Z'
---

## Overview

Microsoft Exchange Server Remote Code Execution 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.