CVE-2021-33818 : Security Advisory and Response

This article discusses a vulnerability found in UniFi Protect G3 FLEX Camera Version UVC.v4.30.0.67 that can be exploited by attackers to launch a denial-of-service attack using the slowhttptest tool.

Understanding CVE-2021-33818

This section delves into the details of the CVE-2021-33818 vulnerability.

What is CVE-2021-33818?

The vulnerability in UniFi Protect G3 FLEX Camera Version UVC.v4.30.0.67 enables attackers to execute a denial-of-service attack by sending incomplete HTTP requests with the slowhttptest tool.

The Impact of CVE-2021-33818

The exploitation of this vulnerability could result in resource exhaustion, leading to a denial-of-service condition on the web server.

Technical Details of CVE-2021-33818

This section outlines the technical aspects of CVE-2021-33818.

Vulnerability Description

The vulnerability allows attackers to keep the server waiting indefinitely for packet completion, which can exhaust server resources.

Affected Systems and Versions

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

Exploitation Mechanism

By utilizing the slowhttptest tool, attackers can send incomplete HTTP requests to trigger a denial-of-service attack.

Mitigation and Prevention

In this section, we discuss the mitigation strategies for CVE-2021-33818.

Immediate Steps to Take

Users are advised to apply security patches provided by the vendor promptly and monitor for any unusual server behavior.

Long-Term Security Practices

Implementing network-level controls and regularly updating security measures can help prevent similar attacks in the future.

Patching and Updates

Regularly check for security advisories from the vendor and apply recommended patches to ensure system security.