CVE-2021-40483 : Security Advisory and Response

A spoofing vulnerability in Microsoft SharePoint Server.

Understanding CVE-2021-40483

The details of the vulnerability affecting Microsoft SharePoint Server.

What is CVE-2021-40483?

The CVE-2021-40483 vulnerability is a spoofing issue in Microsoft SharePoint Server, which was published on October 13, 2021.

The Impact of CVE-2021-40483

This vulnerability has a base severity of HIGH with a CVSS base score of 7.6.

Technical Details of CVE-2021-40483

Exploring the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability allows spoofing, impacting the security of Microsoft SharePoint Server 2019 version 16.0.0 less than 16.0.10379.20000.

Affected Systems and Versions

Vendor: Microsoft
Product: Microsoft SharePoint Server 2019
Platforms: x64-based Systems
Version: 16.0.0 (less than 16.0.10379.20000)

Exploitation Mechanism

The vulnerability can be exploited by attackers to spoof certain aspects of the SharePoint Server, potentially leading to unauthorized access or other security breaches.

Mitigation and Prevention

Understanding how to mitigate and prevent exploitation of CVE-2021-40483.

Immediate Steps to Take

Apply the necessary security updates provided by Microsoft.
Monitor and restrict access to the SharePoint Server to authorized users only.
Educate users about potential phishing attempts or social engineering tactics.

Long-Term Security Practices

Keep software and systems up-to-date with the latest patches and security fixes.
Regularly conduct security audits and assessments to identify vulnerabilities.

Patching and Updates

Ensure that the Microsoft SharePoint Server 2019 version is updated to 16.0.10379.20000 or higher to mitigate the spoofing vulnerability.