CVE-2021-45989 : Exploit Details and Defense Strategies

Tenda routers G1 and G3 v15.11.0.17(9502)_CN contain a stack overflow vulnerability in the guestWifiRuleRefresh function, allowing attackers to launch a Denial of Service (DoS) attack via specific parameters.

Understanding CVE-2021-45989

This CVE pertains to a stack overflow vulnerability found in Tenda routers G1 and G3 v15.11.0.17(9502)_CN.

What is CVE-2021-45989?

CVE-2021-45989 refers to the presence of a stack overflow in Tenda routers G1 and G3 v15.11.0.17(9502)_CN, enabling attackers to induce a Denial of Service (DoS) via particular parameters.

The Impact of CVE-2021-45989

The vulnerability could lead to a Denial of Service (DoS) attack, causing disruption to the normal functioning of the affected routers.

Technical Details of CVE-2021-45989

This section provides detailed technical information on the CVE.

Vulnerability Description

The vulnerability in the guestWifiRuleRefresh function of Tenda routers G1 and G3 v15.11.0.17(9502)_CN allows for a stack overflow, which malicious actors can exploit.

Affected Systems and Versions

Affected Systems: Tenda routers G1 and G3 v15.11.0.17(9502)_CN
Affected Versions: Version 15.11.0.17(9502)_CN

Exploitation Mechanism

Attackers can trigger a Denial of Service (DoS) attack by manipulating the qosGuestUpstream and qosGuestDownstream parameters.

Mitigation and Prevention

Steps to address and prevent CVE-2021-45989 are crucial for maintaining security.

Immediate Steps to Take

Update Tenda routers G1 and G3 to a patched version if available.
Implement network-level controls to filter out malicious traffic targeting the vulnerability.
Monitor network traffic for any anomalous activity.

Long-Term Security Practices

Regularly update router firmware to the latest secure versions.
Conduct security assessments and penetration testing on network devices.
Stay informed about security vulnerabilities and apply patches promptly.
Implement strong network segmentation and access controls.

Patching and Updates

Ensure timely application of patches released by Tenda for the affected routers to mitigate the vulnerability.