Netcore NBR200V2 restore.cgi Command Injection

Technical Analysis

The vulnerability resides in the restore.cgi script within the Backup Restore functionality of Netcore NBR200V2 firmware version 1.3.241127.071246, where the QUERY_STRING parameter is passed to a system-level function without proper sanitization, enabling OS command injection (similar in class to CWE-78). Exploitation requires no authentication and can be performed remotely over the network, typically via a crafted HTTP GET request to the CGI endpoint. With a CVSS score of 9.9, this flaw allows full compromise of the router, including firmware modification, traffic interception, and pivoting into internal networks. Given the public availability of exploit code and lack of vendor response, mass scanning and exploitation attempts are highly likely. Organizations running AI agents or automation pipelines behind or through these routers—such as edge deployments, remote branch offices, or IoT gateways connecting to cloud-based LLM/agent services—face risk of network-level compromise, credential interception, and man-in-the-middle attacks against API traffic used by agentic systems.

Affected Systems

Netcore NBR200V2 router, firmware version 1.3.241127.071246 (and potentially other versions using the same restore.cgi Backup Restore component)

Indicators of Compromise

• Endpoint: /cgi-bin/restore.cgi
• Parameter: QUERY_STRING (command injection vector)
• Associated exploit traffic pattern: HTTP GET/POST requests to restore.cgi with shell metacharacters (e.g., ;, |, &&, $()) in query string

Remediation Steps

1. 1

   Isolate affected devices

   Immediately restrict remote/WAN management access to NBR200V2 devices and place them behind a firewall or VPN to prevent exposure of restore.cgi to the internet.

2. 2

   Disable Backup Restore feature

   If possible, disable the Backup Restore CGI functionality via the router admin interface until a patch is available.

3. 3

   Monitor for exploitation attempts

   Deploy network IDS/IPS signatures to detect suspicious requests to restore.cgi containing shell metacharacters in the QUERY_STRING.

4. 4

   Replace or upgrade hardware

   Given the vendor's lack of response, consider replacing affected Netcore devices with actively supported hardware that receives security patches.

5. 5

   Segment network traffic

   Ensure devices and systems (including any AI agent or automation infrastructure) behind the router are network-segmented to limit blast radius if the router is compromised.