CVE-2021-27821 Explained : Impact and Mitigation

A cross-site scripting vulnerability in the Web Interface for OpenWRT LuCI version 19.07 and lower has been discovered, potentially allowing attackers to execute arbitrary code.

Understanding CVE-2021-27821

This CVE concerns a security flaw in the Web Interface for OpenWRT LuCI, version 19.07 and earlier.

What is CVE-2021-27821?

The vulnerability in the Web Interface for OpenWRT LuCI version 19.07 and below could be exploited by malicious actors to conduct arbitrary code execution.

The Impact of CVE-2021-27821

The impact of this CVE is significant as it could enable attackers to execute arbitrary code on affected systems, leading to potential security breaches and unauthorized access.

Technical Details of CVE-2021-27821

The technical details of this CVE include:

Vulnerability Description

The Web Interface for OpenWRT LuCI version 19.07 and lower is prone to a cross-site scripting vulnerability.

Affected Systems and Versions

The vulnerability affects OpenWRT LuCI version 19.07 and earlier.

Exploitation Mechanism

Attackers can exploit this vulnerability to launch cross-site scripting attacks and potentially execute malicious code on vulnerable systems.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-27821, consider the following measures:

Immediate Steps to Take

Update OpenWRT LuCI to a patched version that addresses the cross-site scripting vulnerability.
Implement network security measures to prevent unauthorized access to the Web Interface.

Long-Term Security Practices

Regularly monitor for security updates and patches provided by the OpenWRT project.
Conduct vulnerability assessments and security audits to identify and address any potential weaknesses in the system.

Patching and Updates

Stay informed about security advisories related to OpenWRT LuCI and apply relevant patches promptly to protect your systems.