Exploited
high
7.8
Advisory Published
Updated

CVE-2021-26858: Microsoft Exchange Server Remote Code Execution Vulnerability

First published: Tue Mar 02 2021(Updated: )

Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

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

Affected SoftwareAffected VersionHow to fix
Microsoft Exchange Server=2013-cumulative_update_23
Microsoft Exchange Server=2016-cumulative_update_18
Microsoft Exchange Server=2016-cumulative_update_19
Microsoft Exchange Server=2019-cumulative_update_7
Microsoft Exchange Server=2019-cumulative_update_8
Microsoft Exchange Server=2010-sp3
Microsoft Exchange Server=2013-cumulative_update_22
Microsoft Exchange Server=2013-sp1
Microsoft Exchange Server=2016-cumulative_update_10
Microsoft Exchange Server=2016-cumulative_update_11
Microsoft Exchange Server=2016-cumulative_update_12
Microsoft Exchange Server=2016-cumulative_update_13
Microsoft Exchange Server=2016-cumulative_update_14
Microsoft Exchange Server=2016-cumulative_update_15
Microsoft Exchange Server=2016-cumulative_update_16
Microsoft Exchange Server=2016-cumulative_update_17
Microsoft Exchange Server=2016-cumulative_update_8
Microsoft Exchange Server=2016-cumulative_update_9
Microsoft Exchange Server=2019
Microsoft Exchange Server=2019-cumulative_update_1
Microsoft Exchange Server=2019-cumulative_update_2
Microsoft Exchange Server=2019-cumulative_update_3
Microsoft Exchange Server=2019-cumulative_update_4
Microsoft Exchange Server=2019-cumulative_update_5
Microsoft Exchange Server=2019-cumulative_update_6
Microsoft Exchange Server
=2010-sp3
=2013-cumulative_update_22
=2013-cumulative_update_23
=2013-sp1
=2016-cumulative_update_10
=2016-cumulative_update_11
=2016-cumulative_update_12
=2016-cumulative_update_13
=2016-cumulative_update_14
=2016-cumulative_update_15
=2016-cumulative_update_16
=2016-cumulative_update_17
=2016-cumulative_update_18
=2016-cumulative_update_19
=2016-cumulative_update_8
=2016-cumulative_update_9
=2019
=2019-cumulative_update_1
=2019-cumulative_update_2
=2019-cumulative_update_3
=2019-cumulative_update_4
=2019-cumulative_update_5
=2019-cumulative_update_6
=2019-cumulative_update_7
=2019-cumulative_update_8

Remedy

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26858

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-26858?

    CVE-2021-26858 is the identifier for the Microsoft Exchange Server Remote Code Execution Vulnerability.

  • What is the severity of CVE-2021-26858?

    The severity of CVE-2021-26858 is critical.

  • How does CVE-2021-26858 impact Microsoft Exchange Server?

    CVE-2021-26858 allows for remote code execution in Microsoft Exchange Server.

  • How can I protect my Microsoft Exchange Server from CVE-2021-26858?

    To protect your Microsoft Exchange Server from CVE-2021-26858, apply the security updates provided by Microsoft.

  • Where can I find more information about CVE-2021-26858?

    You can find more information about CVE-2021-26858 at the following link: [https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26858](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-26858)

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