CVE-2021-28842 : Vulnerability Insights and Analysis

A Null Pointer Deference vulnerability has been identified in TRENDnet TEW-755AP 1.11B03, TEW-755AP2KAC 1.11B03, TEW-821DAP2KAC 1.11B03, and TEW-825DAP 1.11B03. This vulnerability could be exploited by a remote malicious user to cause a denial of service.

Understanding CVE-2021-28842

This section will discuss the details, impact, technical aspects, and mitigation strategies related to CVE-2021-28842.

What is CVE-2021-28842?

The CVE-2021-28842 is a Null Pointer Deference vulnerability found in specific TRENDnet devices. It allows an attacker to trigger a denial of service attack by sending a crafted POST request without a required parameter.

The Impact of CVE-2021-28842

If successfully exploited, this vulnerability could lead to a denial of service condition on the affected TRENDnet devices, impacting their availability and functionality.

Technical Details of CVE-2021-28842

In this section, we will delve into the technical aspects of the CVE-2021-28842 vulnerability.

Vulnerability Description

The vulnerability arises due to improper handling of POST requests on certain TRENDnet devices, allowing an unauthenticated remote attacker to disrupt the service.

Affected Systems and Versions

TRENDnet TEW-755AP 1.11B03, TEW-755AP2KAC 1.11B03, TEW-821DAP2KAC 1.11B03, and TEW-825DAP 1.11B03 are confirmed to be impacted by this vulnerability.

Exploitation Mechanism

An attacker can exploit this vulnerability by sending a malicious POST request to apply_cgi via action do_graph_auth without the required login_name key.

Mitigation and Prevention

This section will outline the steps to mitigate and prevent potential exploitation of CVE-2021-28842.

Immediate Steps to Take

Device owners are advised to restrict network access to the affected devices and monitor for any suspicious activities that could indicate an attack.

Long-Term Security Practices

Implementing strong authentication mechanisms, regular security audits, and keeping devices updated with the latest firmware are essential for long-term security.

Patching and Updates

Users should regularly check for security updates provided by TRENDnet and apply them promptly to address the CVE-2021-28842 vulnerability.