Exploited
high
7.8
CWE
502
Advisory Published
Updated

CVE-2021-26857: 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=2010-sp3
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=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-2021-26857

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-26857?

    CVE-2021-26857 is a vulnerability in Microsoft Exchange Server that allows for remote code execution.

  • How does CVE-2021-26857 affect Microsoft Exchange Server?

    CVE-2021-26857 affects Microsoft Exchange Server by enabling remote code execution.

  • What is the severity of CVE-2021-26857?

    CVE-2021-26857 is classified as critical severity.

  • How can I mitigate CVE-2021-26857?

    To mitigate CVE-2021-26857, apply the security updates provided by Microsoft and follow their recommended guidance.

  • Where can I find more information about CVE-2021-26857?

    For more information about CVE-2021-26857, you can refer to the official CISA website at https://www.cisa.gov/emergency-directive-21-02.

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