CVE-2021-45382 : Vulnerability Insights and Analysis

A Remote Command Execution (RCE) vulnerability exists in D-Link routers DIR-810L, DIR-820L/LW, DIR-826L, DIR-830L, and DIR-836L via the DDNS function.

Understanding CVE-2021-45382

This CVE describes a critical vulnerability in various D-Link router models that can allow remote attackers to execute commands on the affected devices.

What is CVE-2021-45382?

The vulnerability exists in the ncc2 binary file of D-Link routers, specifically affecting models DIR-810L, DIR-820L/LW, DIR-826L, DIR-830L, and DIR-836L. Notably, these devices have reached their end of life.

The Impact of CVE-2021-45382

Due to the RCE ability, attackers can exploit this vulnerability to run arbitrary commands on the routers, potentially leading to unauthorized access, data theft, or further network compromise.

Technical Details of CVE-2021-45382

This section provides additional technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows remote attackers to execute commands on D-Link routers through the DDNS function, posing a serious security risk.

Affected Systems and Versions

All series hardware revisions of D-Link DIR-810L, DIR-820L/LW, DIR-826L, DIR-830L, and DIR-836L routers are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending malicious commands via the ncc2 binary file, gaining unauthorized access to the routers.

Mitigation and Prevention

It is crucial to take immediate actions to protect the affected devices and prevent potential exploitation.

Immediate Steps to Take

Disable the affected routers if feasible, especially since they are end-of-life and will not receive patches.
Implement network segmentation to limit the impact of a potential breach.
Monitor network traffic for any unusual or suspicious activity.

Long-Term Security Practices

Regularly update hardware to supported and actively maintained versions.
Implement strong access controls and authentication mechanisms.
Conduct regular security assessments and audits to identify vulnerabilities.

Patching and Updates

As the affected D-Link routers have reached their end of life, no patches will be issued to address this vulnerability.