CVE-2025-7614 is a command injection vulnerability identified in the TOTOLINK T6 router, specifically version 4.1.5cu.748. The flaw resides in the HTTP POST request handler component, within the delDevice function of the /cgi-bin/cstecgi.cgi file. The vulnerability arises from improper sanitization of the ipAddr argument, which an attacker can manipulate to inject arbitrary commands. This injection allows remote attackers to execute commands on the underlying operating system with the privileges of the HTTP service, potentially leading to unauthorized control over the device. The vulnerability is remotely exploitable without requiring user interaction or authentication, increasing its risk profile. However, the CVSS 4.0 vector indicates that a low privilege level is required (PR:L), and the impact on confidentiality, integrity, and availability is limited (VC:L, VI:L, VA:L). The exploit has been publicly disclosed but is not yet known to be actively exploited in the wild. The vulnerability's medium severity rating (CVSS 5.3) reflects these factors. Command injection in network devices like routers can lead to network compromise, interception of traffic, or pivoting into internal networks, making this a significant concern for organizations relying on TOTOLINK T6 devices.

For European organizations, this vulnerability poses a moderate risk. TOTOLINK routers are often used in small to medium enterprises and residential environments, which may serve as entry points into corporate or home networks. Exploitation could allow attackers to execute arbitrary commands, potentially leading to device takeover, network traffic manipulation, or lateral movement within the network. This could compromise confidentiality by intercepting sensitive data, integrity by altering configurations or data flows, and availability by disrupting network services. Given the remote exploitability without user interaction, attackers could automate attacks at scale. While the impact is rated medium, organizations with TOTOLINK T6 devices in critical network segments or those handling sensitive data should consider this a serious threat. The lack of known active exploitation reduces immediate urgency but does not eliminate risk, especially as exploit code is publicly available.

Organizations should first identify any TOTOLINK T6 routers running version 4.1.5cu.748 within their networks. Since no official patch links are provided, immediate mitigation steps include restricting access to the router's management interface from untrusted networks, ideally limiting it to trusted internal IP ranges or disabling remote management entirely. Network segmentation should be enforced to isolate vulnerable devices from critical infrastructure. Monitoring network traffic for unusual POST requests to /cgi-bin/cstecgi.cgi and anomalous command execution patterns can help detect exploitation attempts. If possible, upgrading to a newer, patched firmware version once available is recommended. Additionally, implementing network-level intrusion prevention systems (IPS) with signatures targeting this vulnerability can provide proactive defense. Regularly auditing device configurations and applying the principle of least privilege for device management accounts will further reduce risk.