CVE-2025-7463 is a critical buffer overflow vulnerability identified in the Tenda FH1201 router, specifically in version 1.2.0.14. The flaw exists within the HTTP POST request handler component, particularly in the function formWrlsafeset located in the /goform/AdvSetWrlsafeset endpoint. The vulnerability arises from improper handling of the 'mit_ssid' argument, which when manipulated by an attacker, causes a buffer overflow. This type of vulnerability can lead to arbitrary code execution or denial of service conditions. The attack vector is remote and does not require user interaction or prior authentication, making exploitation relatively straightforward. The CVSS v4.0 base score is 8.7, indicating a high severity level, with network attack vector, low attack complexity, no privileges required, and no user interaction needed. The impact on confidentiality, integrity, and availability is high, as exploitation could allow an attacker to execute arbitrary code remotely, potentially taking full control of the affected device. Although no public exploits are currently known to be actively used in the wild, the exploit details have been publicly disclosed, increasing the risk of future exploitation. The lack of available patches at the time of disclosure further elevates the threat level for users of this router firmware version.

For European organizations, the exploitation of this vulnerability could have significant consequences. The Tenda FH1201 router is commonly used in small to medium-sized business environments and residential settings, often serving as a gateway device to internal networks. Successful exploitation could allow attackers to gain unauthorized access to internal networks, intercept or manipulate sensitive data, disrupt network availability, or use compromised devices as footholds for further lateral movement or launching attacks on other network assets. This is particularly concerning for organizations with limited network segmentation or those relying on these routers for critical connectivity. The potential for remote code execution without authentication means attackers can target these devices en masse, leading to widespread disruption or espionage activities. Additionally, compromised routers could be leveraged as part of botnets or for launching distributed denial-of-service (DDoS) attacks, impacting broader internet infrastructure and services within Europe.

Given the critical nature of this vulnerability and the absence of official patches at disclosure, European organizations should implement immediate and specific mitigation steps beyond generic advice: 1) Network Segmentation: Isolate Tenda FH1201 devices from critical network segments and sensitive data repositories to limit potential lateral movement. 2) Access Controls: Restrict remote management interfaces and block access to the /goform/AdvSetWrlsafeset endpoint at the network perimeter using firewall rules or web application firewalls (WAFs). 3) Traffic Monitoring: Deploy intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics to detect anomalous HTTP POST requests targeting the vulnerable endpoint or unusual 'mit_ssid' parameter patterns. 4) Device Replacement or Downgrade: If patching is unavailable, consider replacing affected devices with models from vendors with timely security updates or temporarily downgrading firmware to a version not affected by this vulnerability, if such exists and is verified safe. 5) Vendor Engagement: Engage with Tenda for updates on patches or mitigations and subscribe to vulnerability advisories for timely information. 6) Incident Response Preparedness: Prepare for potential exploitation by ensuring logging is enabled on network devices and that incident response teams are aware of the vulnerability and detection methods. 7) User Awareness: Inform users about the risk of connecting to compromised routers and encourage secure configuration practices.