Listen to this Post
How the mentioned CVE works:
The CVE-2025-65202 vulnerability exists in TRENDnet TEW-657BRM routers with firmware version 1.00.1. It involves the setup.cgi binary used in the web management interface. Attackers with valid authentication credentials can exploit this flaw remotely. The HTTP parameters “command”, “todo”, and “next_file” are improperly sanitized. User input passed through these parameters is directly executed as system commands. This allows injection of arbitrary operating system commands. The commands run with root privileges due to insufficient security checks. Exploitation occurs via crafted POST or GET requests to the web interface. For example, embedding shell metacharacters like semicolons or backticks in parameters. This leads to command concatenation and execution. The vulnerability stems from lack of input validation and filtering. It enables remote code execution on the affected device. Attackers can gain full control over the router. They may access sensitive files, modify configurations, or install malware. The device could be used as a pivot for network attacks. Since authentication is required, attackers must first obtain login credentials. However, default credentials are often unchanged. The CVSS 4.0 score indicates high severity. This vulnerability is critical for exposed devices.
Platform: TRENDnet TEW-657BRM
Version: 1.00.1
Vulnerability: OS command injection
Severity: Critical
date: 11/26/2025
Prediction: Patch date TBD
What Undercode Say:
Analytics:
curl -k -X POST “https://192.168.1.1/setup.cgi” -d “command=id&todo=debug&next_file=config”
wget –post-data=”command=cat /etc/passwd&todo=show&next_file=tmp” http://target/setup.cgi
python3 -c “import requests; requests.post(‘http://target/setup.cgi’, data={‘command’:’ls’,’todo’:’run’,’next_file’:’/’})”
how Exploit:
Authenticate to web interface.
Craft malicious HTTP request.
Execute commands as root.
Protection from this CVE:
Disable remote management.
Use strong passwords.
Apply firmware updates.
Network segmentation.
Impact:
Full system compromise.
Data theft and manipulation.
Botnet recruitment potential.
Network pivot attacks.
🎯Let’s Practice Exploiting & Learn Patching For Free:
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
