CVE-2021-34520 Microsoft SharePoint Server Remote Code Execution Vulnerability
An attacker can execute arbitrary code on Microsoft SharePoint Server via a deserialization vulnerability.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-34520?
CVE-2021-34520 is a high-severity unsafe deserialization vulnerability in Microsoft Sharepoint Foundation, published on 14 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Microsoft SharePoint Server Remote Code Execution Vulnerability
Weakness: CWE-502
Which versions are affected by CVE-2021-34520?
It affects 2 products.
Products include Microsoft Sharepoint Foundation, Microsoft Sharepoint Server.
How do I fix CVE-2021-34520?
No fix has been published for CVE-2021-34520 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2021-34520 being exploited?
There is no known exploitation of CVE-2021-34520 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Sharepoint Foundation
- CVE-2014-2816 Privilege escalation in n/a
- CVE-2023-21742 Microsoft SharePoint Server Remote Code Execution Vulnerability
- CVE-2023-21744 Microsoft SharePoint Server Remote Code Execution Vulnerability
- CVE-2022-44690 Microsoft SharePoint Server Remote Code Execution Vulnerability
- CVE-2022-41036 Microsoft SharePoint Server Remote Code Execution Vulnerability
Sources
Also known as GHSA-hr4m-jq9r-c4gx.