CVE-2021-27076: Microsoft SharePoint InfoPath List Deserialization of Untrusted Data Remote Code Execution Vulnerability
Microsoft SharePoint Server Remote Code Execution Vulnerability
Other sources
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft SharePoint Server. Authentication is required to exploit this vulnerability. The specific flaw exists within the processing of InfoPath attachments. Tampering with client-side data can trigger the deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of the SharePoint web server process.
— ZDI
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10372.20000Patch KB4493230 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5134.1000Patch KB4493232 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 15.0.5327.1000Patch KB4493238 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 14.0.7267.5000Patch KB3101541
Event History
Frequently Asked Questions
What is the vulnerability ID for this issue?
The vulnerability ID for this issue is CVE-2021-27076.
What is the severity of CVE-2021-27076?
The severity of CVE-2021-27076 is high with a CVSS score of 8.8.
Which software versions are affected by CVE-2021-27076?
Microsoft SharePoint Enterprise Server 2016, SharePoint Server 2019, SharePoint Foundation 2013, and Business Productivity Servers 2010 are affected by CVE-2021-27076.
How can I fix CVE-2021-27076?
To fix CVE-2021-27076, apply the respective patches provided by Microsoft for the affected software versions.
Where can I find more information about CVE-2021-27076?
You can find more information about CVE-2021-27076 on the Microsoft Security Response Center advisory page and the Zero Day Initiative advisory page.