CVE-2025-69762 identifies a critical stack-based buffer overflow vulnerability in the Tenda AX3 router firmware version 16.03.12.11. The vulnerability resides in the formSetIptv function, which improperly handles the 'list' parameter, allowing an attacker to overflow the stack. This memory corruption can be exploited remotely without any authentication or user interaction, enabling arbitrary code execution on the device. The vulnerability is classified under CWE-121 (Stack-based Buffer Overflow), a common and dangerous flaw that can lead to full system compromise. The CVSS v3.1 base score of 9.8 reflects the high impact on confidentiality, integrity, and availability, combined with the ease of remote exploitation (network attack vector, no privileges or user interaction required). Although no exploits have been observed in the wild yet and no official patches have been published, the risk is significant due to the critical nature of the flaw and the widespread use of Tenda AX3 routers in home and small business environments. Attackers could leverage this vulnerability to gain persistent control over affected devices, potentially pivoting into internal networks or disrupting network services. The lack of patches necessitates immediate mitigation efforts to reduce exposure.

For European organizations, this vulnerability poses a severe threat, especially for those relying on Tenda AX3 routers in their network infrastructure. Successful exploitation could lead to complete compromise of the router, allowing attackers to intercept, modify, or disrupt network traffic, exfiltrate sensitive data, or launch further attacks within the internal network. This could impact confidentiality by exposing private communications, integrity by altering data flows, and availability by causing device crashes or denial of service. Critical sectors such as finance, healthcare, government, and telecommunications could face operational disruptions and data breaches. The vulnerability's remote and unauthenticated nature increases the risk of widespread exploitation, particularly if routers are accessible from the internet or poorly segmented networks. The absence of patches further exacerbates the threat, making proactive defenses essential to prevent exploitation and limit potential damage.

European organizations should immediately audit their networks to identify Tenda AX3 routers running firmware version 16.03.12.11. Since no patches are currently available, organizations should implement network segmentation to isolate vulnerable devices from critical systems and restrict access to router management interfaces, preferably limiting them to trusted internal networks. Disable the IPTV feature or the formSetIptv functionality if not required, reducing the attack surface. Employ intrusion detection and prevention systems (IDS/IPS) to monitor for anomalous traffic patterns targeting the router's management or IPTV interfaces. Regularly update router firmware when vendors release patches and subscribe to vendor advisories for timely updates. Additionally, consider replacing vulnerable devices with models from vendors with stronger security track records if immediate patching is not feasible. Conduct user awareness training to recognize signs of network compromise and establish incident response plans tailored to network device breaches.