Exploited
8.8
CWE
434
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2021-31207: (Pwn2Own) Microsoft Exchange Server Arbitrary File Write Remote Code Execution Vulnerability

First published: Tue May 11 2021(Updated: )

Microsoft Exchange Server contains an unspecified vulnerability that allows for security feature bypass.

Credit: secure@microsoft.com secure@microsoft.com secure@microsoft.com

Affected SoftwareAffected VersionHow to fix
Microsoft Exchange Server 2016=19
Microsoft Exchange Server 2013=23
Microsoft Exchange Server 2019=9
Microsoft Exchange Server 2019=8
Microsoft Exchange Server 2016=20
Microsoft Exchange Server=2013-cumulative_update_23
Microsoft Exchange Server=2016-cumulative_update_19
Microsoft Exchange Server=2016-cumulative_update_20
Microsoft Exchange Server=2019-cumulative_update_8
Microsoft Exchange Server=2019-cumulative_update_9
Microsoft Exchange
Microsoft Exchange Server
=2013-cumulative_update_23
=2016-cumulative_update_19
=2016-cumulative_update_20
=2019-cumulative_update_8
=2019-cumulative_update_9

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Frequently Asked Questions

  • What is CVE-2021-31207?

    CVE-2021-31207 is a security feature bypass vulnerability in Microsoft Exchange Server.

  • How does CVE-2021-31207 affect Microsoft Exchange Server?

    CVE-2021-31207 allows remote attackers to execute arbitrary code on affected installations of Microsoft Exchange Server.

  • What is the severity of CVE-2021-31207?

    CVE-2021-31207 has a severity rating of 8.8, which is classified as high severity.

  • Which versions of Microsoft Exchange Server are affected by CVE-2021-31207?

    Microsoft Exchange Server 2013 (cumulative update 23), 2016 (cumulative update 19 and 20), and 2019 (cumulative update 8 and 9) are affected by CVE-2021-31207.

  • How can the authentication mechanism be bypassed in CVE-2021-31207?

    CVE-2021-31207 allows bypassing the existing authentication mechanism.

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