CVE-2026-5184 Overview
A command injection vulnerability has been identified in TRENDnet TEW-713RE wireless range extenders running firmware versions up to 1.02. The vulnerability exists in the /goform/setSysAdm endpoint, where improper handling of the admuser argument allows attackers to inject arbitrary system commands. This flaw can be exploited remotely by authenticated attackers, potentially leading to complete device compromise.
Critical Impact
Successful exploitation allows remote attackers to execute arbitrary commands on the affected device, potentially gaining full control over the wireless range extender and pivoting to other network resources.
Affected Products
- TRENDnet TEW-713RE firmware version 1.02 and earlier
- TRENDnet TEW-713RE wireless range extender devices
Discovery Timeline
- 2026-03-31 - CVE-2026-5184 published to NVD
- 2026-04-01 - Last updated in NVD database
Technical Details for CVE-2026-5184
Vulnerability Analysis
This vulnerability is classified as CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), commonly known as injection. The affected endpoint /goform/setSysAdm fails to properly sanitize user-supplied input in the admuser parameter before passing it to system command execution functions.
When processing administrative user configuration requests, the firmware directly incorporates the admuser value into system commands without adequate input validation or sanitization. This allows an attacker with network access and valid credentials to craft malicious input that breaks out of the intended command context and executes arbitrary commands on the underlying operating system.
The exploit has been publicly documented, increasing the risk of exploitation in the wild. The vendor was contacted regarding this vulnerability but did not respond to disclosure attempts.
Root Cause
The root cause of this vulnerability is insufficient input validation in the web management interface. The admuser parameter is passed directly to command execution functions without proper sanitization of shell metacharacters such as semicolons, pipes, backticks, and other command separators. This allows attackers to append or inject additional commands that execute with the privileges of the web server process, typically root on embedded devices.
Attack Vector
The attack can be initiated remotely over the network by any authenticated user who can access the device's web management interface. The attacker submits a specially crafted HTTP request to the /goform/setSysAdm endpoint with malicious command sequences embedded in the admuser parameter.
The vulnerability is documented with a proof-of-concept available in public repositories. Due to the nature of this vulnerability, exploitation requires only low-privilege authentication and no user interaction, making it a practical target for both opportunistic and targeted attacks against IoT devices.
For technical details and proof-of-concept information, refer to the GitHub PoC for Trendnet and VulDB Vulnerability #354252.
Detection Methods for CVE-2026-5184
Indicators of Compromise
- Unusual HTTP POST requests to /goform/setSysAdm containing shell metacharacters (;, |, $(), backticks)
- Unexpected outbound network connections from the TRENDnet device
- Presence of unauthorized processes or services running on the device
- Modified configuration files or unexpected user accounts on the device
Detection Strategies
- Monitor web server logs for suspicious requests to /goform/setSysAdm with unusual parameter values
- Implement network-based intrusion detection rules to identify command injection patterns in HTTP traffic
- Deploy endpoint detection and response solutions that can identify anomalous process execution on network devices
- Conduct regular firmware integrity checks to detect unauthorized modifications
Monitoring Recommendations
- Enable comprehensive logging on network perimeter devices and web application firewalls
- Establish baseline network behavior for IoT devices and alert on deviations
- Monitor for unusual DNS queries or outbound connections originating from the TEW-713RE device
- Implement network segmentation to isolate IoT devices and limit lateral movement potential
How to Mitigate CVE-2026-5184
Immediate Actions Required
- Restrict network access to the device's web management interface using firewall rules or access control lists
- Place the TRENDnet TEW-713RE on an isolated network segment with limited connectivity
- Disable remote management access if not strictly required
- Monitor the device for signs of compromise and consider replacement with actively supported hardware
Patch Information
As of the last update, TRENDnet has not released a security patch for this vulnerability. The vendor was contacted during the responsible disclosure process but did not respond. Users should monitor the VulDB Submission #780389 and TRENDnet's official support channels for potential updates.
Given the lack of vendor response, affected organizations should prioritize network-level mitigations and consider device replacement with equipment from vendors that provide timely security updates.
Workarounds
- Implement web application firewall rules to filter requests containing shell metacharacters in the admuser parameter
- Restrict access to the management interface to trusted IP addresses only using router ACLs or firewall policies
- Use a VPN to access the device management interface rather than exposing it to the broader network
- Consider replacing end-of-support devices with actively maintained alternatives
# Example iptables rule to restrict management access to trusted IP
iptables -A INPUT -p tcp --dport 80 -s 192.168.1.100 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
