CVE-2025-7614 is a command injection vulnerability identified in the TOTOLINK T6 router firmware version 4.1.5cu.748. The vulnerability resides in the delDevice function within the /cgi-bin/cstecgi.cgi component, which handles HTTP POST requests. Specifically, the issue arises from insufficient sanitization or validation of the ipAddr argument passed to this function. An attacker can remotely exploit this flaw by crafting a malicious HTTP POST request that manipulates the ipAddr parameter, resulting in arbitrary command execution on the affected device. This type of vulnerability is critical because it allows an unauthenticated remote attacker to execute system-level commands, potentially gaining control over the device or using it as a pivot point for further network attacks. However, the CVSS 4.0 vector indicates that some privileges (PR:L) are required, and the impact on confidentiality, integrity, and availability is limited (VC:L, VI:L, VA:L). The vulnerability does not require user interaction (UI:N) and can be exploited remotely (AV:N). Although the CVSS score is 5.3 (medium severity), the presence of a public exploit disclosure increases the risk of exploitation. No patches or official remediation guidance have been published yet, and no known exploits in the wild have been reported at this time. The vulnerability affects a specific firmware version of the TOTOLINK T6 router, which is a consumer and small office/home office (SOHO) networking device commonly used for internet connectivity and local network management.

For European organizations, this vulnerability poses a significant risk particularly to small and medium enterprises (SMEs) and home office setups that rely on TOTOLINK T6 routers. Successful exploitation could lead to unauthorized command execution, enabling attackers to disrupt network operations, intercept or manipulate traffic, or use compromised routers as footholds for lateral movement within corporate networks. This could result in data breaches, service interruptions, or the deployment of further malware. Given the medium CVSS score but critical nature of command injection, the impact on confidentiality, integrity, and availability is non-trivial. Organizations with remote or distributed workforces using vulnerable devices are especially at risk. The lack of available patches means that affected devices remain exposed until mitigations are applied. Additionally, the public disclosure of the exploit code increases the likelihood of opportunistic attacks targeting unpatched devices across Europe.

Immediate mitigation steps include isolating affected TOTOLINK T6 devices from critical network segments and restricting remote management access to trusted IP addresses or VPNs. Network administrators should disable or restrict access to the /cgi-bin/cstecgi.cgi interface if possible. Employing network-level intrusion detection or prevention systems (IDS/IPS) to monitor and block suspicious HTTP POST requests targeting the delDevice function can reduce exploitation risk. Organizations should inventory their network hardware to identify devices running the vulnerable firmware version and prioritize their replacement or firmware upgrade once a patch is available. In the absence of official patches, consider deploying compensating controls such as network segmentation, strict firewall rules, and enhanced logging to detect exploitation attempts. Users should also change default credentials and ensure strong authentication mechanisms are in place to limit privilege escalation. Regular monitoring for unusual device behavior or network traffic patterns indicative of compromise is recommended.