CVE-2026-2534 identifies a command injection vulnerability in the Comfast CF-N1 V2 wireless device firmware version 2.6.0.2. The vulnerability resides in the CGI script endpoint /cgi-bin/mbox-config with the query parameters method=SET and section=ptest_bandwidth. The specific vulnerable function, sub_44AC4C, improperly sanitizes or validates the 'bandwidth' argument, allowing an attacker to inject arbitrary shell commands. This injection occurs because user-supplied input is passed directly or indirectly to system-level command execution without sufficient filtering or escaping. The vulnerability is remotely exploitable over the network without requiring authentication or user interaction, increasing the attack surface. The CVSS 4.0 base score is 5.3 (medium), reflecting the ease of remote exploitation but limited scope and impact. The vendor was contacted but has not issued a patch or advisory, and public exploit details have been disclosed, increasing the risk of exploitation. Successful exploitation could allow attackers to execute arbitrary commands with the privileges of the web server process, potentially leading to device compromise, network disruption, or pivoting attacks within the network. The lack of vendor response and patch availability heightens the urgency for affected users to implement mitigations.

For European organizations, this vulnerability poses a significant risk to network infrastructure security, especially for those deploying Comfast CF-N1 V2 devices in critical environments such as enterprise branches, retail locations, or industrial sites. Exploitation could lead to unauthorized command execution on network devices, resulting in compromised device integrity, potential data interception or manipulation, and denial of service conditions. Given the device’s role in wireless connectivity, attackers could disrupt network availability or use the compromised device as a foothold for lateral movement within corporate networks. The absence of vendor patches means organizations must rely on compensating controls to mitigate risk. The public availability of exploit code increases the likelihood of opportunistic attacks targeting vulnerable devices in Europe. Organizations with limited network segmentation or outdated device inventories are particularly vulnerable. Additionally, the medium severity score suggests that while the impact is not catastrophic, the ease of exploitation and remote nature make it a credible threat that could affect operational continuity and data security.

1. Immediately identify and inventory all Comfast CF-N1 V2 devices running firmware version 2.6.0.2 within the network. 2. Restrict network access to the device management interfaces, especially the /cgi-bin/mbox-config endpoint, by implementing strict firewall rules and network segmentation to limit exposure to trusted administrators only. 3. Employ web application firewalls (WAFs) or intrusion prevention systems (IPS) with custom rules to detect and block suspicious requests targeting the bandwidth parameter or the vulnerable CGI endpoint. 4. Disable remote management features if not strictly necessary, or enforce VPN access with strong authentication for remote administration. 5. Monitor device logs and network traffic for unusual command execution patterns or unexpected outbound connections originating from the device. 6. Consider deploying network anomaly detection tools to identify lateral movement attempts stemming from compromised devices. 7. Engage with Comfast support channels to request official patches or firmware updates and subscribe to vendor advisories for future updates. 8. If feasible, plan for device replacement with models that have active vendor support and security updates. 9. Educate network administrators on the risks of command injection and the importance of input validation in device management interfaces.