CVE-2021-41366 Explained : Impact and Mitigation

Credential Security Support Provider Protocol (CredSSP) Elevation of Privilege Vulnerability was published by Microsoft on November 10, 2021.

Understanding CVE-2021-41366

This CVE details a security vulnerability impacting various Microsoft Windows versions.

What is CVE-2021-41366?

The vulnerability affects the Credential Security Support Provider Protocol (CredSSP).

The Impact of CVE-2021-41366

Type: Elevation of Privilege
Severity: High (CVSS Base Score 7.8)
Attack Vector: Local
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality, Integrity, and Availability Impact: High
Remediation Level: Official Fix
Report Confidence: Confirmed

Technical Details of CVE-2021-41366

This section provides technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows attackers to elevate privileges through CredSSP.

Affected Systems and Versions

The following Microsoft products and versions are affected:

Windows 10 Version 1809, 1909, 21H1, 2004, 20H2
Windows Server 2019, 2022
Windows 11 version 21H2
Windows 10 Version 1507, 1607
Windows 8.1
Windows Server 2012, 2012 R2, 2016

Exploitation Mechanism

Attackers can exploit this vulnerability locally to escalate privileges within the affected systems.

Mitigation and Prevention

Steps to address and prevent exploitation of CVE-2021-41366.

Immediate Steps to Take

Apply official patches and updates provided by Microsoft.
Implement the principle of least privilege to limit potential impacts.

Long-Term Security Practices

Regularly update systems with the latest security patches.
Conduct security assessments and penetration tests to identify and remediate vulnerabilities.

Patching and Updates

Apply the security updates released by Microsoft to address CVE-2021-41366.