CVE-2021-45736 Explained : Impact and Mitigation

TOTOLINK X5000R v9.1.0u.6118_B20201102 contains a stack overflow vulnerability in the setL2tpServerCfg function, enabling attackers to trigger a Denial of Service (DoS) attack.

Understanding CVE-2021-45736

This CVE pertains to a Denial of Service vulnerability in the TOTOLINK X5000R router.

What is CVE-2021-45736?

The vulnerability allows malicious actors to exploit the setL2tpServerCfg function to cause a Denial of Service (DoS) using specific parameters.

The Impact of CVE-2021-45736

Exploitation of this vulnerability can lead to service disruption on affected TOTOLINK X5000R routers.

Technical Details of CVE-2021-45736

This section delves into the specifics of the CVE.

Vulnerability Description

The vulnerability in the setL2tpServerCfg function of TOTOLINK X5000R v9.1.0u.6118_B20201102 results in a stack overflow, facilitating a DoS attack.

Affected Systems and Versions

Product: TOTOLINK X5000R
Version: v9.1.0u.6118_B20201102

Exploitation Mechanism

Attackers can exploit the vulnerability by manipulating certain parameters (eip, sip, server) through the setL2tpServerCfg function.

Mitigation and Prevention

Discover how to address and prevent the CVE.

Immediate Steps to Take

Apply vendor-supplied patches promptly to mitigate the vulnerability.
Implement network segmentation to minimize the impact of potential attacks.

Long-Term Security Practices

Regularly update and maintain router firmware to protect against known vulnerabilities.
Conduct security assessments to identify and address any security gaps.

Patching and Updates

Regularly check for firmware updates and security advisories from TOTOLINK to apply necessary patches.