CVE-2021-33820 : What You Need to Know

A denial-of-service vulnerability has been discovered in UniFi Protect G3 FLEX Camera Version UVC.v4.30.0.67. An attacker could exploit this issue by sending a large number of TCP SYN packets to exhaust the web service's resources.

Understanding CVE-2021-33820

This section provides insights into the impact, technical details, and mitigation strategies related to CVE-2021-33820.

What is CVE-2021-33820?

CVE-2021-33820 refers to a denial-of-service vulnerability in UniFi Protect G3 FLEX Camera Version UVC.v4.30.0.67. Attackers can overwhelm the web server by flooding it with TCP SYN packets, resulting in a denial-of-service condition.

The Impact of CVE-2021-33820

The exploitation of this vulnerability can lead to service unavailability for legitimate users, causing disruption to normal operations and potentially exposing the system to further attacks.

Technical Details of CVE-2021-33820

This section outlines the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability allows attackers to launch a denial-of-service attack by sending a significant number of TCP SYN packets, depleting the resources of the web service and rendering it unavailable.

Affected Systems and Versions

UniFi Protect G3 FLEX Camera Version UVC.v4.30.0.67 is specifically impacted by this vulnerability.

Exploitation Mechanism

The exploitation involves sending a large volume of TCP SYN packets to overwhelm the targeted web server, leading to a denial-of-service scenario.

Mitigation and Prevention

In this section, we discuss the immediate steps to take, long-term security practices, and the importance of applying patches and updates.

Immediate Steps to Take

System administrators should consider implementing network-level protections, such as rate limiting and filtering, to mitigate the risk of exploitation. It is also crucial to monitor network traffic for unusual patterns that may indicate a potential attack.

Long-Term Security Practices

Regular security assessments, network monitoring, and timely software updates are essential for maintaining a secure environment and reducing the likelihood of successful attacks.

Patching and Updates

Vendors may release patches or updates to address the vulnerability. It is recommended to apply these patches promptly to safeguard systems against known security issues.