CVE-2021-27403 : Security Advisory and Response

This CVE-2021-27403 article provides detailed information on a cross-site scripting vulnerability affecting Askey RTF8115VW BR_SV_g11.11_RTF_TEF001_V6.54_V014 devices in the cgi-bin/te_acceso_router.cgi script.

Understanding CVE-2021-27403

This section will cover the impact, technical details, and mitigation strategies related to CVE-2021-27403.

What is CVE-2021-27403?

The CVE-2021-27403 vulnerability allows attackers to execute malicious scripts on the web interface of Askey RTF8115VW BR_SV_g11.11_RTF_TEF001_V6.54_V014 routers through cross-site scripting (XSS) in the curWebPage parameter of the cgi-bin/te_acceso_router.cgi script.

The Impact of CVE-2021-27403

Exploitation of this vulnerability could lead to unauthorized access to sensitive information, session hijacking, and potentially full control over the router settings.

Technical Details of CVE-2021-27403

In-depth technical details regarding the vulnerability, affected systems, and exploitation methods.

Vulnerability Description

The vulnerability lies in the improper validation of user-supplied input in the curWebPage parameter, allowing attackers to inject and execute malicious scripts.

Affected Systems and Versions

Askey RTF8115VW BR_SV_g11.11_RTF_TEF001_V6.54_V014 devices are confirmed to be affected by this vulnerability.

Exploitation Mechanism

Malicious actors can exploit this vulnerability by sending crafted HTTP requests containing malicious scripts to the targeted cgi-bin/te_acceso_router.cgi endpoint.

Mitigation and Prevention

This section outlines the immediate steps to take to mitigate the CVE-2021-27403 vulnerability and prevent future occurrences.

Immediate Steps to Take

Change default passwords, restrict access to the router's interface, and apply security updates recommended by the vendor.

Long-Term Security Practices

Regularly update firmware, monitor network activity for suspicious behavior, and educate users on safe browsing practices.

Patching and Updates

Stay informed about security advisories from Askey and promptly apply any patches or updates released to address CVE-2021-27403.