CVE-2025-57218 is a stack overflow vulnerability identified in the firmware version 16.03.10.09_multi_TDE01 of the Tenda AC10 v4.0 wireless router. The vulnerability arises from improper handling of the 'security_5g' parameter within the function sub_46284C. A stack overflow occurs when data exceeding the allocated buffer size is written onto the stack, potentially overwriting adjacent memory. This can lead to arbitrary code execution, denial of service, or system instability. In this case, the vulnerability is triggered by specially crafted input to the 'security_5g' parameter, which is likely related to the configuration of the 5 GHz wireless security settings. Since the vulnerability is in the router firmware, exploitation could allow an attacker to gain control over the device or disrupt its operation. No CVSS score has been assigned yet, and there are no known exploits in the wild. The lack of patch information suggests that a fix may not yet be available, increasing the risk for affected users. The Tenda AC10 is a consumer-grade router commonly used in home and small office environments, and its compromise could lead to network traffic interception, lateral movement within the network, or use as a foothold for further attacks.

For European organizations, especially small businesses and home offices relying on Tenda AC10 routers, this vulnerability poses a significant risk. Successful exploitation could lead to unauthorized access to internal networks, interception of sensitive communications, and potential disruption of internet connectivity. Given the router's role as a gateway device, compromise could undermine the confidentiality and integrity of organizational data. Additionally, attackers could leverage the compromised device to launch attacks against other internal systems or external targets, potentially implicating the organization in malicious activities. The impact is heightened in environments where these routers are used without additional network segmentation or security controls. The absence of a patch and public exploit code increases the urgency for proactive mitigation to prevent exploitation.

Organizations should immediately inventory their network devices to identify any Tenda AC10 v4.0 routers running the vulnerable firmware version 16.03.10.09_multi_TDE01. Until a vendor patch is released, it is recommended to restrict access to the router's management interfaces, especially from untrusted networks. Disabling remote management and ensuring that only trusted administrators can configure the device reduces the attack surface. Network segmentation should be implemented to isolate the router from critical systems. Monitoring network traffic for unusual activity originating from the router can help detect exploitation attempts. If possible, replacing the affected router with a device from a different vendor or a newer model with updated firmware is advisable. Organizations should also subscribe to vendor advisories and CVE databases to apply patches promptly once available. Employing intrusion detection systems that can identify stack overflow exploit attempts targeting routers may provide additional defense.