CVE-2021-21820 : What You Need to Know

A hard-coded password vulnerability in D-Link DIR-3040 1.13B03 allows attackers to execute arbitrary code by sending crafted network requests.

Understanding CVE-2021-21820

This CVE highlights a critical hard-coded password issue in D-Link DIR-3040 1.13B03 that can be exploited for unauthorized code execution.

What is CVE-2021-21820?

The CVE-2021-21820 vulnerability involves a hardcoded password flaw in the Libcli Test Environment feature of D-Link DIR-3040 1.13B03. Attackers can leverage specially crafted network requests to achieve code execution.

The Impact of CVE-2021-21820

With a CVSS base score of 10 (Critical), the vulnerability poses high risks, impacting confidentiality, integrity, and availability. An attacker can exploit it without requiring any special privileges.

Technical Details of CVE-2021-21820

This section delves into the specifics of the CVE, detailing the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability stems from a hard-coded password flaw in the Libcli Test Environment functionality of D-Link DIR-3040 1.13B03. Crafted network requests can trigger this issue, leading to unauthorized code execution.

Affected Systems and Versions

D-Link DIR-3040 1.13B03 is the specific version affected by this vulnerability.

Exploitation Mechanism

Attackers exploit this vulnerability by sending a sequence of crafted network requests to the target system, enabling them to execute arbitrary code.

Mitigation and Prevention

This section provides guidance on mitigating the risks associated with CVE-2021-21820, including immediate steps and long-term security practices.

Immediate Steps to Take

Users are advised to apply security patches promptly, change default passwords, and restrict network access to vulnerable devices.

Long-Term Security Practices

Implement security best practices such as regular security assessments, network segmentation, and continuous monitoring to enhance overall cybersecurity posture.

Patching and Updates

Stay informed about security updates from D-Link and apply patches as soon as they are released to address the vulnerability effectively.