CVE-2021-35325 : What You Need to Know

A stack overflow vulnerability in the checkLoginUser function of TOTOLINK A720R allows attackers to trigger a denial of service (DOS) attack.

Understanding CVE-2021-35325

This CVE identifies a stack overflow issue in TOTOLINK A720R routers that could be exploited by malicious actors to disrupt the router's services.

What is CVE-2021-35325?

The CVE-2021-35325 vulnerability is a stack overflow in the checkLoginUser function of TOTOLINK A720R routers, potentially leading to a denial of service.

The Impact of CVE-2021-35325

The impact of this vulnerability is that attackers could exploit it to cause a denial of service, rendering the affected TOTOLINK A720R router inoperable.

Technical Details of CVE-2021-35325

This section outlines the technical aspects of the CVE, detailing the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

The stack overflow vulnerability arises in the checkLoginUser function of TOTOLINK A720R routers, specifically in the A720R_Firmware v4.1.5cu.470_B20200911 version.

Affected Systems and Versions

The vulnerability affects TOTOLINK A720R routers running the v4.1.5cu.470_B20200911 firmware version.

Exploitation Mechanism

Attackers can exploit this vulnerability by triggering a stack overflow in the checkLoginUser function, causing a denial of service on the TOTOLINK A720R router.

Mitigation and Prevention

To secure systems from CVE-2021-35325, immediate actions and long-term security measures should be taken.

Immediate Steps to Take

Immediately update the firmware of the TOTOLINK A720R router to a patched version provided by the vendor.

Long-Term Security Practices

Implement network segmentation, access controls, and regular security audits to prevent future vulnerabilities.

Patching and Updates

Regularly check for firmware updates and patches released by TOTOLINK to mitigate the CVE-2021-35325 vulnerability.