CVE-2021-40473 : Security Advisory and Response

Microsoft Excel Remote Code Execution Vulnerability has a high CVSS base score of 7.8.

Understanding CVE-2021-40473

This CVE involves a Remote Code Execution vulnerability in Microsoft Excel.

What is CVE-2021-40473?

CVE-2021-40473 is a vulnerability that allows attackers to execute malicious code remotely on systems running specific Microsoft Office versions.

The Impact of CVE-2021-40473

The vulnerability poses a high risk, with a CVSS base score of 7.8, indicating a significant security threat to affected systems.

Technical Details of CVE-2021-40473

This section provides specific technical details about the vulnerability.

Vulnerability Description

The vulnerability enables remote code execution, allowing threat actors to execute malicious code on compromised systems.

Affected Systems and Versions

Microsoft Office 2019 (Version: 19.0.0)
Microsoft 365 Apps for Enterprise (Version: 16.0.1)
Microsoft Office LTSC 2021 (Version: 16.0.1)
Microsoft Office 2016 (Version: 16.0.0, less than 16.0.5227.1000)
Microsoft Office 2013 Service Pack 1 (Version: 15.0.0, less than 15.0.5389.1000)

Exploitation Mechanism

The vulnerability can be exploited by luring a user to open a specially crafted Excel file, triggering the code execution.

Mitigation and Prevention

To protect systems from CVE-2021-40473, follow these security measures:

Immediate Steps to Take

Implement security updates provided by Microsoft.
Educate users about the risks of opening unknown attachments.

Long-Term Security Practices

Regularly update and patch Microsoft Office products.
Utilize advanced threat protection mechanisms to detect and prevent malicious activities.

Patching and Updates

Apply the latest security updates released by Microsoft to address the vulnerability.