What is CVE-2021-26427?

CVE-2021-26427 is a Remote Code Execution vulnerability in Microsoft Exchange Server.

How severe is CVE-2021-26427?

CVE-2021-26427 has a severity rating of 9, which is considered critical.

Which versions of Microsoft Exchange Server are affected by CVE-2021-26427?

CVE-2021-26427 affects Microsoft Exchange Server 2013 cumulative update 23, Microsoft Exchange Server 2016 cumulative update 21 and 22, and Microsoft Exchange Server 2019 cumulative update 10 and 11.

How can I fix CVE-2021-26427?

To fix CVE-2021-26427, apply the security updates provided by Microsoft. More information can be found in the Microsoft Security Advisory: [https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26427](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26427)

Vulnerability/
CVE-2021-26427

critical

9.6

13/10/2021

3/8/2024

CVE-2021-26427: Microsoft Exchange Server Remote Code Execution Vulnerability

First published: Wed Oct 13 2021(Updated: )

Microsoft Exchange Server Remote Code Execution Vulnerability

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

Affected Software	Affected Version	How to fix
Microsoft Exchange Server	=2013-cumulative_update_23
Microsoft Exchange Server	=2016-cumulative_update_21
Microsoft Exchange Server	=2016-cumulative_update_22
Microsoft Exchange Server	=2019-cumulative_update_10
Microsoft Exchange Server	=2019-cumulative_update_11

Remedy

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26427

Never miss a vulnerability like this again

Reference Links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26427

Frequently Asked Questions

What is CVE-2021-26427?
CVE-2021-26427 is a Remote Code Execution vulnerability in Microsoft Exchange Server.
How severe is CVE-2021-26427?
CVE-2021-26427 has a severity rating of 9, which is considered critical.
Which versions of Microsoft Exchange Server are affected by CVE-2021-26427?
CVE-2021-26427 affects Microsoft Exchange Server 2013 cumulative update 23, Microsoft Exchange Server 2016 cumulative update 21 and 22, and Microsoft Exchange Server 2019 cumulative update 10 and 11.
How can I fix CVE-2021-26427?
To fix CVE-2021-26427, apply the security updates provided by Microsoft. More information can be found in the Microsoft Security Advisory: [https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26427](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26427)

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agent/title
agent/tags
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collector/nvd-api
agent/software-canonical-lookup-request
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vendor/microsoft
canonical/microsoft exchange server
version/microsoft exchange server/2013-cumulative_update_23
version/microsoft exchange server/2016-cumulative_update_21
version/microsoft exchange server/2016-cumulative_update_22
version/microsoft exchange server/2019-cumulative_update_10
version/microsoft exchange server/2019-cumulative_update_11

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Contact

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