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 Software | Affected Version | How to fix |
|---|---|---|
| =2013-sp1 | ||
| =2016 | ||
| =2019 | ||
| Microsoft SharePoint Foundation | =2013-sp1 | |
| Microsoft SharePoint Server | =2016 | |
| Microsoft SharePoint Server | =2019 | |
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Reference Links
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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