8.8
CWE
502
Advisory Published
Advisory Published
Updated

CVE-2021-34520: Microsoft SharePoint SetVariableActivity Deserialization of Untrusted Data Remote Code Execution Vulnerability

First published: Wed Jul 14 2021(Updated: )

Microsoft SharePoint Server Remote Code Execution Vulnerability

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

Affected SoftwareAffected VersionHow to fix
=2013-sp1
=2016
=2019
Microsoft SharePoint Foundation=2013-sp1
Microsoft SharePoint Server=2016
Microsoft SharePoint Server=2019

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Frequently Asked Questions

  • What is CVE-2021-34520?

    CVE-2021-34520 is a vulnerability that allows remote attackers to execute arbitrary code on affected installations of Microsoft SharePoint.

  • How severe is CVE-2021-34520?

    CVE-2021-34520 has a severity rating of 8.8 out of 10, indicating a high level of risk.

  • What is the affected software by CVE-2021-34520?

    Microsoft SharePoint versions 2013 SP1, 2016, and 2019 are affected by CVE-2021-34520.

  • What is the specific flaw in CVE-2021-34520?

    The specific flaw in CVE-2021-34520 exists within the Microsoft.SharePoint.WorkflowActions.SetVariableActivity class.

  • How can I exploit CVE-2021-34520?

    Authentication is required to exploit CVE-2021-34520.

  • Are there any references for CVE-2021-34520?

    Yes, you can find more information about CVE-2021-34520 at the following references: [Reference 1](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34520), [Reference 2](https://www.zerodayinitiative.com/advisories/ZDI-21-828/), [Reference 3](https://msrc.microsoft.com/update-guide/en-us/vulnerability/CVE-2021-34520).

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