Learn about CVE-2021-21913, a critical vulnerability in D-Link DIR-3040 1.13B03 allowing attackers to execute commands via MQTT service. Find mitigation steps and security practices.
This article provides detailed information about CVE-2021-21913, which describes an information disclosure vulnerability in the WiFi Smart Mesh functionality of D-LINK DIR-3040 1.13B03, posing a critical threat to affected systems.
Understanding CVE-2021-21913
CVE-2021-21913 highlights a critical information disclosure vulnerability present in certain versions of D-Link routers that can be exploited through a specially-crafted network request.
What is CVE-2021-21913?
The vulnerability in D-LINK DIR-3040 1.13B03 allows attackers to execute malicious commands by connecting to the MQTT service, potentially compromising the confidentiality and integrity of the system.
The Impact of CVE-2021-21913
With a CVSS base score of 10, this critical vulnerability has a high impact on affected systems. It poses a significant risk to confidentiality, integrity, and availability due to the potential for command execution.
Technical Details of CVE-2021-21913
CVE-2021-21913 is classified under CWE-798, describing the use of hard-coded credentials to exploit the information disclosure vulnerability in D-LINK DIR-3040 1.13B03.
Vulnerability Description
The vulnerability arises from the WiFi Smart Mesh functionality, allowing unauthorized remote access to execute commands through a specially-crafted network request.
Affected Systems and Versions
The affected product is D-Link's D-LINK DIR-3040 1.13B03 version.
Exploitation Mechanism
Attackers can connect to the MQTT service over the network to exploit the vulnerability and execute unauthorized commands, leading to potential security breaches.
Mitigation and Prevention
To safeguard systems from CVE-2021-21913, immediate action and long-term security practices are essential.
Immediate Steps to Take
It is crucial to apply security patches or updates provided by D-Link to mitigate the vulnerability. Additionally, restricting network access and monitoring for suspicious activities can help prevent exploitation.
Long-Term Security Practices
Implementing network segmentation, using strong, unique passwords, and regularly updating firmware are vital practices to enhance overall system security.
Patching and Updates
Regularly check for firmware patches and updates from D-Link to address security issues and vulnerabilities effectively.