Cloud Defense Logo

Products

Solutions

Company

Book A Live Demo

CVE-2021-21986 Explained : Impact and Mitigation

Learn about CVE-2021-21986 impacting VMware vCenter Server and Cloud Foundation, enabling unauthorized actions by attackers with network access to port 443.

A vulnerability in the vSphere Client (HTML5) authentication mechanism affects VMware vCenter Server and VMware Cloud Foundation. Attackers with network access to port 443 on vCenter Server can exploit this issue without authentication.

Understanding CVE-2021-21986

This CVE impacts the Virtual SAN Health Check, Site Recovery, vSphere Lifecycle Manager, and VMware Cloud Director Availability plug-ins.

What is CVE-2021-21986?

The vSphere Client (HTML5) vulnerability enables unauthorized actions by malicious actors with network access to port 443 on vCenter Server.

The Impact of CVE-2021-21986

The vulnerability allows attackers to perform actions permitted by the affected plug-ins without authentication, posing a significant security risk.

Technical Details of CVE-2021-21986

The vulnerability lies in the vSphere Client (HTML5) authentication mechanism. Affected systems include VMware vCenter Server versions 6.5 to 7.0 U2b and VMware Cloud Foundation versions 3.x to 4.2.1.

Vulnerability Description

A flaw in the authentication mechanism of vSphere Client (HTML5) exposes Virtual SAN Health Check, Site Recovery, and other plug-ins to unauthorized access.

Affected Systems and Versions

VMware vCenter Server versions 6.5 to 7.0 U2b and VMware Cloud Foundation versions 3.x to 4.2.1 are affected by this vulnerability.

Exploitation Mechanism

Malicious actors can exploit this vulnerability by gaining network access to port 443 on the vCenter Server.

Mitigation and Prevention

To safeguard your systems against CVE-2021-21986, immediate action is crucial.

Immediate Steps to Take

Ensure that access to port 443 on vCenter Server is restricted and monitor for any suspicious activities.

Long-Term Security Practices

Regularly update your VMware software to the latest versions and follow security best practices to enhance protection.

Patching and Updates

Apply the relevant security patches provided by VMware to address this vulnerability effectively.

Popular CVEs

CVE Id

Published Date

Is your System Free of Underlying Vulnerabilities?
Find Out Now