Overview

CVE-2026-94097 is a vulnerability in the Netcore NBR200V2 router, version 1.3.241127.071246. The vulnerability is located in the CGI Diagnostic Endpoint, specifically in the /www/cgi-bin/network_tools file. This endpoint is susceptible to command injection attacks, allowing an attacker to execute arbitrary commands on the device.

Understanding the Vulnerability / Threat

Root Cause Analysis

The root cause of this vulnerability is a design issue, specifically a lack of proper input validation and sanitization in the CGI Diagnostic Endpoint. This allows an attacker to inject malicious commands, which are then executed by the device. The vulnerability belongs to the CWE-74 (Improper Neutralization of External Inputs to a Web Server) and CWE-77 (Command Injection) categories.

Attack Surface & Vector

The attack surface for this vulnerability is the network interface of the Netcore NBR200V2 router. An attacker can exploit this vulnerability remotely, without requiring any authentication or user interaction. The attack vector is through the CGI Diagnostic Endpoint, specifically by manipulating the 'param', 'key', and 'val' arguments.

Exploitation Mechanics — Scenario Walkthrough

Scenario: Compromising a Netcore NBR200V2 Router 1. Initial Position: An attacker gains access to the network interface of the Netcore NBR200V2 router, version 1.3.241127.071246. 2. Triggering the Flaw: The attacker crafts a malicious HTTP request to the /www/cgi-bin/network_tools endpoint, injecting a command in the 'param', 'key', or 'val' argument. For example, the attacker might send a request with a serialized command, such as `param=$(command)`, which is then executed by the device. 3. What Breaks: The security boundary fails because the device does not properly validate and sanitize the input, allowing the injected command to be executed. This leads to a chain reaction, enabling the attacker to execute arbitrary commands on the device. 4. Attacker's Prize: The attacker gains remote code execution capabilities on the device, allowing them to modify configurations, extract sensitive information, or use the device as a pivot point for further attacks.

Real-World Impact

The impact of this vulnerability can be significant. An attacker could exploit it to gain unauthorized access to the device, extract sensitive information, or disrupt network operations. Given the CVSS score of 10, it's clear that this vulnerability has a high severity and requires immediate attention.

Detection & Defense

Immediate Mitigations

To address this vulnerability, it's essential to upgrade the Netcore NBR200V2 router to a version that includes a patch for CVE-2026-94097. The vendor, Netcore, should provide an updated version that fixes the command injection vulnerability.

Detection Strategies

Defenders can detect exploitation attempts by monitoring network traffic and logs for suspicious activity, such as unusual requests to the CGI Diagnostic Endpoint. Implementing a web application firewall (WAF) with rules to detect and block malicious input can also help.

Long-Term Hardening

To prevent similar vulnerabilities, it's crucial to implement secure coding practices, such as input validation and sanitization, when developing firmware and software for IoT devices like the Netcore NBR200V2 router. Regular security audits and penetration testing can also help identify and address potential vulnerabilities.

Key Takeaways

* CVE-2026-94097 is a critical vulnerability in the Netcore NBR200V2 router, allowing for remote command injection. * The vulnerability is caused by a design issue, specifically a lack of proper input validation and sanitization in the CGI Diagnostic Endpoint. * Defenders should upgrade to a patched version, monitor network traffic and logs, and implement secure coding practices to prevent similar vulnerabilities. * The CVSS score of 10 indicates a high severity, requiring immediate attention.

Sources

* National Vulnerability Database (NVD) - CVE-2026-94097