CVE-2021-45739 : Exploit Details and Defense Strategies

TOTOLINK A720R v4.1.5cu.470_B20200911 was discovered to contain a stack overflow in the Form_Login function, leading to a Denial of Service (DoS) vulnerability.

Understanding CVE-2021-45739

This CVE identifies a vulnerability in the TOTOLINK A720R router that could be exploited for DoS attacks.

What is CVE-2021-45739?

The vulnerability in TOTOLINK A720R v4.1.5cu.470_B20200911 enables attackers to trigger a DoS condition through the flag parameter.

The Impact of CVE-2021-45739

The vulnerability allows malicious actors to disrupt network services and cause a DoS attack on the affected device.

Technical Details of CVE-2021-45739

This section delves into the specifics of the vulnerability.

Vulnerability Description

A stack overflow in the Form_Login function of TOTOLINK A720R v4.1.5cu.470_B20200911 can be exploited by attackers for DoS attacks.

Affected Systems and Versions

Product: TOTOLINK A720R
Version: v4.1.5cu.470_B20200911

Exploitation Mechanism

Attackers can exploit the vulnerability by manipulating the flag parameter to trigger the stack overflow.

Mitigation and Prevention

Protecting systems from this vulnerability requires specific actions.

Immediate Steps to Take

Implement network-level protections to filter and block potential malicious traffic.
Apply firewall rules to restrict unauthorized access to the vulnerable device.
Regularly monitor network traffic for any unusual patterns that could indicate an ongoing attack.

Long-Term Security Practices

Keep network devices updated with the latest firmware to patch known vulnerabilities.
Conduct regular security assessments and penetration testing to identify and address potential weaknesses.

Patching and Updates

Check for security advisories from TOTOLINK regarding the vulnerability and follow recommended patching procedures.