CVE-2025-7525 is a command injection vulnerability identified in the TOTOLINK T6 router, specifically version 4.1.5cu.748_B20211015. The flaw exists in the HTTP POST request handler component, within the setTracerouteCfg function of the /cgi-bin/cstecgi.cgi script. An attacker can manipulate the 'command' argument in the HTTP POST request to inject arbitrary system commands. This vulnerability allows remote attackers to execute commands on the underlying operating system without requiring authentication or user interaction. The vulnerability is classified as medium severity with a CVSS 4.0 base score of 5.3, reflecting its moderate impact and ease of exploitation. The attack vector is network-based (AV:N), with low attack complexity (AC:L), and no privileges or user interaction needed (PR:L, UI:N). The vulnerability impacts confidentiality, integrity, and availability to a limited extent (VC:L, VI:L, VA:L). Although no public exploits are currently known to be in the wild, the exploit details have been disclosed publicly, increasing the risk of exploitation. The vulnerability arises from improper input validation and sanitization of user-supplied data in the traceroute configuration interface, enabling command injection. This can lead to unauthorized remote code execution, potentially allowing attackers to take control of the device, intercept or manipulate network traffic, disrupt network services, or pivot into internal networks.

For European organizations, the exploitation of CVE-2025-7525 could have significant consequences, especially for those relying on TOTOLINK T6 routers in their network infrastructure. Successful exploitation could lead to unauthorized remote control of routers, enabling attackers to intercept sensitive communications, manipulate routing configurations, or launch further attacks within the internal network. This could compromise confidentiality of data, integrity of network operations, and availability of critical services. Small and medium enterprises (SMEs) and home office environments using these routers may be particularly vulnerable due to limited IT security resources. Additionally, sectors with high reliance on secure and stable network infrastructure, such as finance, healthcare, and government agencies, could face operational disruptions and data breaches. The lack of authentication requirement and ease of exploitation increase the risk of widespread attacks if the vulnerability is not promptly addressed.

To mitigate the risk posed by CVE-2025-7525, European organizations should take the following specific actions: 1) Immediately identify and inventory all TOTOLINK T6 routers running the affected firmware version 4.1.5cu.748_B20211015. 2) Monitor vendor communications closely for official patches or firmware updates addressing this vulnerability and apply them as soon as they become available. 3) In the absence of a patch, restrict access to the router's management interface by implementing network segmentation and firewall rules to limit HTTP POST access to trusted management networks only. 4) Disable remote management features if not required, especially those exposing the /cgi-bin/cstecgi.cgi endpoint. 5) Employ intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics to detect anomalous traceroute configuration requests or command injection attempts targeting this vulnerability. 6) Regularly audit router configurations and logs for suspicious activities indicative of exploitation attempts. 7) Educate network administrators about this vulnerability and ensure they follow secure configuration best practices. 8) Consider replacing affected devices with models from vendors with robust security update policies if timely patches are unavailable.