Mitigation Strategies

To mitigate the command injection vulnerability in the Tenda 5G03 router firmware version V05.03.02.04, immediate steps include avoiding the use of the vulnerable function by not sending requests to the endpoint /cgi-bin/luci/admin/telephony/trigger_call_dial_constant with the dialNumber parameter.

Additionally, restrict access to the router's administrative interface to trusted networks only, and monitor for any suspicious activity that might indicate exploitation attempts.

If possible, apply any available firmware updates or patches provided by the vendor that address this vulnerability.

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Executive Summary

CVE-2026-38064 is a command injection vulnerability found in the Tenda 5G03 router firmware version V05.03.02.04. It occurs in the function action_dial_call within the file /usr/lib/lua/luci/controller/admin/telephony.lua. The vulnerability arises because the dialNumber parameter is not properly sanitized, allowing an attacker to inject arbitrary shell commands.

An attacker can exploit this by sending a specially crafted HTTP POST request to the endpoint /cgi-bin/luci/admin/telephony/trigger_call_dial_constant with a malicious dialNumber value containing command injection payloads.

Successful exploitation can lead to unauthorized command execution on the router, potentially compromising its security.

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Impact Analysis

This vulnerability can allow an attacker to execute arbitrary commands on the affected Tenda 5G03 router. This unauthorized command execution can lead to a full compromise of the router's security.

• Attackers could gain control over the router, potentially intercepting or manipulating network traffic.
• It may allow attackers to disrupt network services or use the router as a foothold for further attacks within the network.
• Sensitive information stored or passing through the router could be exposed or altered.

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Detection Guidance

This vulnerability can be detected by sending a crafted HTTP POST request to the vulnerable endpoint on the Tenda 5G03 router and observing if command injection is possible via the dialNumber parameter.

Specifically, you can test the endpoint `/cgi-bin/luci/admin/telephony/trigger_call_dial_constant` by sending a POST request with a malicious dialNumber value containing shell command payloads.

• Use curl to send a test POST request with a payload that attempts command injection, for example: curl -X POST http://<router-ip>/cgi-bin/luci/admin/telephony/trigger_call_dial_constant -d "dialNumber=123;id"
• If the response or router behavior indicates execution of the injected command (e.g., output of `id` command), the vulnerability is present.

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