CVE-2021-28843 : Security Advisory and Response
Learn about CVE-2021-28843, a Null Pointer Dereference vulnerability in TRENDnet TEW-755AP, TEW-755AP2KAC, TEW-821DAP2KAC, and TEW-825DAP, allowing attackers to cause denial of service.
A Null Pointer Dereference vulnerability has been identified in TRENDnet TEW-755AP 1.11B03, TEW-755AP2KAC 1.11B03, TEW-821DAP2KAC 1.11B03, and TEW-825DAP 1.11B03. An attacker can exploit this issue by sending a POST request to apply_cgi with an unknown action name.
Understanding CVE-2021-28843
This section provides insights into the nature of the vulnerability and its implications.
What is CVE-2021-28843?
The CVE-2021-28843 is a Null Pointer Dereference vulnerability found in multiple TRENDnet devices, allowing an attacker to trigger the issue by using a specially crafted request.
The Impact of CVE-2021-28843
Exploitation of this vulnerability can lead to a denial of service (DoS) condition as it could result in a device crash or unresponsiveness.
Technical Details of CVE-2021-28843
In this section, we delve into the technical aspects of the CVE-2021-28843 vulnerability.
Vulnerability Description
The vulnerability arises from a flaw in how the affected TRENDnet devices handle POST requests with specific parameters, resulting in a Null Pointer Dereference.
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
By sending a POST request to apply_cgi with an unknown action name, an attacker can trigger the Null Pointer Dereference flaw.
Mitigation and Prevention
This section offers guidance on how to address and safeguard against the CVE-2021-28843 vulnerability.
Immediate Steps to Take
Users are advised to apply security patches provided by TRENDnet to mitigate the risk associated with CVE-2021-28843.
Long-Term Security Practices
Implementing network security measures, such as firewall rules and access controls, can help prevent unauthorized access to vulnerable devices.
Patching and Updates
Regularly check for firmware updates and security advisories from TRENDnet to ensure that your devices are protected against known vulnerabilities.