CVE-2021-43217 : Vulnerability Insights and Analysis

Windows Encrypting File System (EFS) Remote Code Execution Vulnerability identified by Microsoft on 2021-12-15

Understanding CVE-2021-43217

This CVE relates to a Remote Code Execution vulnerability in Windows Encrypting File System (EFS).

What is CVE-2021-43217?

Windows EFS vulnerability allowing Remote Code Execution

The Impact of CVE-2021-43217

Severity: HIGH (CVSS Base Score: 8.1)
Attack Vector: Network
Attack Complexity: High
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality, Integrity, and Availability Impact: High
Exploit Code Maturity: Functional exploit code exists

Technical Details of CVE-2021-43217

This section provides in-depth technical aspects of the vulnerability.

Vulnerability Description

Windows EFS Remote Code Execution flaw

Affected Systems and Versions

Microsoft products and versions impacted:

Windows 10 Version 1809 (10.0.17763.2366)
Windows Server 2019 (10.0.17763.2366)
More affected systems and versions detailed in Microsoft's advisory

Exploitation Mechanism

Exploiting the EFS vulnerability to execute malicious code remotely

Mitigation and Prevention

Steps to secure systems against CVE-2021-43217

Immediate Steps to Take

Apply security patches promptly
Implement network segmentation
Monitor for malicious activity

Long-Term Security Practices

Conduct regular security audits
Train employees on cybersecurity best practices
Keep systems updated with the latest security patches
Use encryption and access controls