CVE-2025-7525 is a command injection vulnerability identified in the TOTOLINK T6 router, specifically version 4.1.5cu.748_B20211015. The flaw resides in the HTTP POST request handler component, within the setTracerouteCfg function of the /cgi-bin/cstecgi.cgi CGI script. This function processes a 'command' argument that is insufficiently sanitized, allowing an attacker to inject arbitrary OS commands. The vulnerability can be exploited remotely without authentication or user interaction, as the HTTP POST request can be sent directly to the affected endpoint. The CVSS 4.0 base score is 5.3 (medium severity), reflecting that while the attack vector is network-based and requires low attack complexity, it does require low privileges (PR:L) and results in low impact on confidentiality, integrity, and availability. However, the exploit has been publicly disclosed, increasing the risk of exploitation. No patches or mitigations have been officially released at the time of publication. The vulnerability allows attackers to execute arbitrary commands on the router, potentially leading to full device compromise, network reconnaissance, or pivoting to internal networks. The TOTOLINK T6 is a consumer-grade wireless router commonly used in home and small office environments, which may also be deployed in small business contexts. The exposure of this vulnerability could enable attackers to disrupt network operations, intercept or manipulate traffic, or use compromised devices as footholds for further attacks.

For European organizations, especially small businesses and home offices relying on TOTOLINK T6 routers, this vulnerability poses a significant risk. Exploitation could lead to unauthorized control over network infrastructure, enabling attackers to intercept sensitive communications, disrupt internet connectivity, or launch attacks against internal systems. Given the router's role as a gateway device, compromise could undermine network integrity and confidentiality. The public disclosure of the exploit increases the likelihood of opportunistic attacks. Organizations with limited IT security resources may be particularly vulnerable due to the lack of immediate patches and the ease of remote exploitation. Additionally, compromised routers could be leveraged in botnets or for launching attacks on critical infrastructure, indirectly affecting larger enterprises and public services. The medium CVSS score suggests moderate impact, but the real-world consequences could be severe if exploited in targeted attacks or combined with other vulnerabilities.

1. Immediate mitigation should include isolating affected TOTOLINK T6 devices from critical networks until a patch is available. 2. Network administrators should implement strict firewall rules to restrict access to router management interfaces, especially blocking external HTTP POST requests to /cgi-bin/cstecgi.cgi. 3. Disable remote management features on the router if not required, reducing the attack surface. 4. Monitor network traffic for unusual traceroute or CGI request patterns indicative of exploitation attempts. 5. Employ network segmentation to limit the impact of a compromised router on sensitive internal systems. 6. Regularly update router firmware and subscribe to vendor advisories for patch releases. 7. Consider replacing vulnerable devices with models from vendors with stronger security track records if patches are delayed. 8. Use intrusion detection/prevention systems (IDS/IPS) to detect and block exploitation attempts targeting this vulnerability. 9. Educate users about the risks of using outdated or unsupported network devices and encourage timely updates.