CVE-2021-45986 Explained : Impact and Mitigation

Tenda routers G1 and G3 v15.11.0.17(9502)_CN were found to have a command injection vulnerability, enabling attackers to execute arbitrary commands.

Understanding CVE-2021-45986

What is CVE-2021-45986?

The CVE-2021-45986 vulnerability exists in Tenda routers G1 and G3 v15.11.0.17(9502)_CN due to a flaw in the formSetUSBShareInfo function, allowing malicious command execution via the usbOrdinaryUserName parameter.

The Impact of CVE-2021-45986

This vulnerability could be exploited by attackers to run arbitrary commands on the affected routers, potentially leading to unauthorized access, data theft, and further network compromise.

Technical Details of CVE-2021-45986

Vulnerability Description

The command injection vulnerability in Tenda routers G1 and G3 v15.11.0.17(9502)_CN permits threat actors to execute commands through the usbOrdinaryUserName parameter.

Affected Systems and Versions

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

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious commands via the usbOrdinaryUserName parameter, gaining unauthorized access to the routers.

Mitigation and Prevention

Immediate Steps to Take

Immediately update the router firmware to the latest version provided by Tenda.
Disable remote access to the router interface if not needed.
Regularly monitor for any unusual behavior or unauthorized access attempts.

Long-Term Security Practices

Implement strong network segmentation to limit the impact of potential breaches.
Enforce complex password policies and avoid default login credentials.
Conduct regular security audits and vulnerability assessments to stay proactive.

Patching and Updates

Ensure timely installation of security patches and updates released by Tenda to remediate the CVE-2021-45986 vulnerability.