CVE-2026-94097 Overview
CVE-2026-94097 is a command injection vulnerability in the Netcore NBR200V2 router running firmware version 1.3.241127.071246. The flaw resides in the /www/cgi-bin/network_tools CGI Diagnostic Endpoint. Attackers can manipulate the param, key, or val arguments to inject arbitrary operating system commands. Exploitation is possible remotely over the network without authentication or user interaction. The exploit has been publicly disclosed, and the vendor did not respond to disclosure attempts. The weakness is classified under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component).
Critical Impact
Unauthenticated remote attackers can execute arbitrary commands on affected Netcore NBR200V2 routers, resulting in full device compromise and network pivoting opportunities.
Affected Products
- Netcore NBR200V2 router
- Firmware version 1.3.241127.071246
- CGI Diagnostic Endpoint component (/www/cgi-bin/network_tools)
Discovery Timeline
- 2026-09-21 - CVE-2026-94097 published to the National Vulnerability Database (NVD)
- 2026-09-24 - Last updated in NVD database
Technical Details for CVE-2026-94097
Vulnerability Analysis
The vulnerability affects the CGI Diagnostic Endpoint served at /www/cgi-bin/network_tools on the Netcore NBR200V2. This endpoint accepts user-controlled input through the param, key, and val arguments. Improper neutralization of shell metacharacters allows attackers to break out of the intended command context and append arbitrary OS commands. Because the CGI process typically runs with elevated privileges on embedded routers, successful injection grants attackers control over the underlying Linux environment.
Remote attackers can reach the endpoint over the network without credentials. Public disclosure of the exploit increases the risk of opportunistic scanning and exploitation. The vendor was contacted before disclosure but did not respond, and no patch has been announced.
Root Cause
The root cause is a failure to sanitize or validate parameters passed from the HTTP request into an underlying shell or system call. The CGI handler concatenates attacker-supplied values directly into command strings, mapping to [CWE-74] injection weaknesses. Any character that the shell interprets as a separator or subshell trigger allows arbitrary command execution.
Attack Vector
An attacker sends a crafted HTTP request to the /www/cgi-bin/network_tools endpoint containing malicious payloads in the param, key, or val fields. The router's CGI handler executes the injected commands under the privileges of the web service. Devices exposed to the internet or reachable from untrusted network segments are directly at risk. Refer to the VulDB CVE-2026-94097 entry and the Notion Vulnerability Overview for public technical details. No verified proof-of-concept code is included here.
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Stop Exploit AttemptsDetection Methods for CVE-2026-94097
Indicators of Compromise
- Inbound HTTP requests to /www/cgi-bin/network_tools containing shell metacharacters such as ;, |, &, $(), or backticks in the param, key, or val parameters.
- Unexpected outbound connections originating from the router to attacker-controlled infrastructure following CGI requests.
- New or unknown processes, cron entries, or startup scripts on the device consistent with post-exploitation persistence.
Detection Strategies
- Inspect web server and CGI access logs on the router for requests targeting network_tools with anomalous query strings.
- Deploy network intrusion detection signatures that flag HTTP requests with command-injection patterns directed at embedded device management endpoints.
- Correlate router-originated DNS lookups and outbound connections with known malicious infrastructure using threat intelligence feeds.
Monitoring Recommendations
- Forward router syslog and HTTP request telemetry to a centralized logging platform for retention and analysis.
- Baseline normal administrative access patterns to the router and alert on deviations from expected source IPs or user agents.
- Monitor for firmware integrity changes and unexpected configuration modifications on Netcore devices.
How to Mitigate CVE-2026-94097
Immediate Actions Required
- Restrict management access to the Netcore NBR200V2 to trusted internal networks and block all external access to the web interface.
- Place affected devices behind a firewall that denies inbound traffic to CGI endpoints from untrusted sources.
- Audit routers for signs of prior exploitation, including unauthorized configuration changes and unknown processes.
Patch Information
At the time of publication, the vendor has not released a patch and did not respond to disclosure attempts. Organizations operating Netcore NBR200V2 devices should monitor the VulDB CVE-2026-94097 record for updates and consider replacing the device if no firmware update becomes available.
Workarounds
- Disable remote management on the WAN interface and limit web administration to a dedicated management VLAN.
- Segment vulnerable routers away from sensitive internal assets to limit lateral movement following compromise.
- Consider replacing the affected hardware with a supported model if the vendor remains unresponsive.
# Example: block external access to the router web/CGI interface at an upstream firewall
iptables -A FORWARD -p tcp -d <router_ip> --dport 80 -m iprange ! --src-range <trusted_range> -j DROP
iptables -A FORWARD -p tcp -d <router_ip> --dport 443 -m iprange ! --src-range <trusted_range> -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
