CVE-2021-26420 : What You Need to Know

Microsoft SharePoint Server Remote Code Execution Vulnerability was first published on June 8, 2021, with a CVSS base score of 7.1.

Understanding CVE-2021-26420

This CVE relates to a Remote Code Execution vulnerability affecting Microsoft SharePoint Server.

What is CVE-2021-26420?

The CVE-2021-26420 is a critical Remote Code Execution vulnerability that allows threat actors to execute arbitrary code on a target system.

The Impact of CVE-2021-26420

The impact of this vulnerability is severe, with a CVSS base score of 7.1 (High), making it crucial to address promptly.

Technical Details of CVE-2021-26420

This section will delve into the specifics of the vulnerability.

Vulnerability Description

The vulnerability allows remote attackers to execute arbitrary code on vulnerable systems, posing a significant security risk.

Affected Systems and Versions

Microsoft SharePoint Enterprise Server 2016 versions less than 16.0.5173.1000 (x64-based Systems)
Microsoft SharePoint Server 2019 versions less than 16.0.10375.20000 (x64-based Systems)
Microsoft SharePoint Foundation 2013 Service Pack 1 versions less than 15.0.5353.1000 (x64-based Systems)

Exploitation Mechanism

Malicious actors can exploit this vulnerability remotely to run arbitrary code on the affected systems, compromising their integrity.

Mitigation and Prevention

To safeguard your systems from CVE-2021-26420, follow these guidelines:

Immediate Steps to Take

Apply security patches provided by Microsoft immediately.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Regularly update and patch your SharePoint servers.
Implement network segmentation to limit the vulnerability's impact.

Patching and Updates

Ensure that your SharePoint Server is always up to date with the latest security patches and updates to mitigate the risk of exploitation.