CVE-2021-33755 : What You Need to Know

Windows Hyper-V Denial of Service Vulnerability was published by Microsoft on July 14, 2021.

Understanding CVE-2021-33755

This CVE involves a Denial of Service vulnerability impacting various Microsoft Windows versions.

What is CVE-2021-33755?

CVE-2021-33755 refers to a Denial of Service vulnerability in Windows Hyper-V.

The Impact of CVE-2021-33755

The vulnerability is rated as MEDIUM with a CVSS base score of 6.3. Attackers can exploit this issue and cause a denial of service on affected systems.

Technical Details of CVE-2021-33755

This section provides insight into the vulnerability details.

Vulnerability Description

The vulnerability allows attackers to launch denial of service attacks on Windows Hyper-V systems.

Affected Systems and Versions

Windows 10 Version 1809: less than 10.0.17763.2061
Windows Server 2019: less than 10.0.17763.2061
Windows Server 2019 (Server Core installation): less than 10.0.17763.2061
Windows 10 Version 1909: less than 10.0.18363.1679
Windows 10 Version 21H1: less than 10.0.19043.1110
Windows 10 Version 2004: less than 10.0.19041.1110
Windows Server version 2004: less than 10.0.19041.1110
Windows Server version 20H2: less than 10.0.19042.1110

Exploitation Mechanism

The vulnerability can be exploited by malicious actors to disrupt services and operations on vulnerable Windows Hyper-V systems.

Mitigation and Prevention

Protect your systems with the following measures.

Immediate Steps to Take

Apply security updates provided by Microsoft promptly.
Consider network segmentation to minimize the impact of potential attacks.

Long-Term Security Practices

Regularly monitor security advisories from Microsoft.
Implement security best practices to safeguard critical infrastructure.

Patching and Updates

Make sure to install the latest security patches and updates from Microsoft to mitigate the risk of exploitation.