CVE-2026-5183: TRENDnet TEW-713RE RCE Vulnerability

CVE-2026-5183 Overview

A command injection vulnerability has been identified in TRENDnet TEW-713RE wireless range extender devices running firmware versions up to 1.02. The vulnerability exists in the sub_421494 function within the /goform/addRouting endpoint, where improper handling of the dest argument allows attackers to inject and execute arbitrary system commands.

This firmware vulnerability in the TRENDnet wireless range extender enables remote attackers with network access to execute malicious commands on the affected device. The exploit has been publicly disclosed, increasing the risk of active exploitation in the wild.

Critical Impact

Remote attackers can exploit this command injection vulnerability to execute arbitrary commands on vulnerable TRENDnet TEW-713RE devices, potentially leading to complete device compromise, network pivoting, or persistent backdoor installation.

Affected Products

• TRENDnet TEW-713RE firmware version 1.02 and earlier
• TRENDnet TEW-713RE wireless range extender devices

Discovery Timeline

• 2026-03-31 - CVE-2026-5183 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2026-5183

Vulnerability Analysis

This command injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) affects the routing configuration functionality of the TRENDnet TEW-713RE wireless range extender. The vulnerable function sub_421494 processes user-supplied input from the dest parameter without adequate sanitization or validation before incorporating it into system commands.

The device's web management interface exposes the /goform/addRouting endpoint, which accepts routing configuration parameters. When a malicious payload is submitted through the dest argument, the firmware fails to properly neutralize special characters and command separators, allowing shell command injection.

The vulnerability is remotely exploitable over the network, requires low privileges (authenticated access), and can affect the confidentiality, integrity, and availability of the device.

Root Cause

The root cause of this vulnerability is insufficient input validation and improper neutralization of user-controlled data in the sub_421494 function. The dest parameter value is passed directly to system command execution functions without proper sanitization, escaping, or whitelisting of allowed characters. This allows attackers to break out of the intended command context and inject arbitrary commands using shell metacharacters such as semicolons, pipes, or command substitution syntax.

Attack Vector

The attack is conducted remotely over the network by targeting the web management interface of the TRENDnet TEW-713RE device. An attacker with low-level access to the device's administrative interface can craft a malicious HTTP request to the /goform/addRouting endpoint with a specially crafted dest parameter containing shell commands.

The injected commands execute with the privileges of the web server process, which typically runs as root on embedded devices like this wireless range extender. This enables attackers to perform actions such as establishing reverse shells, modifying device configurations, installing malware, or using the compromised device as a pivot point for further network attacks.

Technical details regarding the exploitation mechanism are available in the GitHub vulnerability report.

Detection Methods for CVE-2026-5183

Indicators of Compromise

• Unusual HTTP POST requests to /goform/addRouting containing shell metacharacters (;, |, $(), backticks) in the dest parameter
• Unexpected outbound network connections from the TRENDnet TEW-713RE device
• Anomalous processes or services running on the device that were not present during normal operation
• Modifications to device configuration files or firmware

Detection Strategies

• Monitor web server logs on TRENDnet devices for requests to /goform/addRouting with suspicious payload patterns
• Implement network intrusion detection rules to identify command injection attempts targeting embedded device web interfaces
• Deploy network traffic analysis to detect unusual communication patterns from IoT devices
• Perform regular firmware integrity verification to detect unauthorized modifications

Monitoring Recommendations

• Segment network infrastructure to isolate IoT and embedded devices from critical systems
• Enable logging on network firewalls for all traffic to and from wireless range extenders
• Implement anomaly-based detection for embedded device behavior on the network
• Conduct periodic vulnerability scans of network infrastructure devices

How to Mitigate CVE-2026-5183

Immediate Actions Required

• Restrict network access to the TRENDnet TEW-713RE web management interface to trusted IP addresses only
• Place vulnerable devices behind a firewall with strict access control rules
• Disable remote management access if not required for operational purposes
• Monitor devices for signs of compromise and unusual activity

Patch Information

The vendor (TRENDnet) was contacted about this vulnerability but did not respond. At the time of publication, no official patch is available. Organizations should implement compensating controls and consider device replacement if security is critical.

For additional vulnerability details, refer to the VulDB advisory.

Workarounds

• Implement network segmentation to isolate vulnerable TRENDnet devices from sensitive network segments
• Configure firewall rules to block external access to the device's web management interface (typically port 80/443)
• Enable access control lists (ACLs) on upstream network devices to limit connectivity to the wireless range extender
• Consider replacing end-of-life or unpatched devices with actively supported alternatives
• Deploy network monitoring to alert on exploitation attempts targeting the /goform/addRouting endpoint