CVE-2025-50528 is a buffer overflow vulnerability identified in the fromNatStaticSetting function of the Tenda AC6 router firmware versions up to and including V15.03.05.19. The vulnerability is triggered via the 'page' parameter, which suggests that improper bounds checking or input validation occurs when processing this parameter. Buffer overflow vulnerabilities typically allow an attacker to overwrite adjacent memory, potentially leading to arbitrary code execution, denial of service, or system instability. In this case, exploitation could allow an attacker to execute code with the privileges of the router's firmware process, which often runs with elevated permissions. The vulnerability affects a specific function related to NAT static settings, indicating that the attack vector likely involves sending crafted requests to the router's management interface or web interface that handles NAT configuration. Although no known exploits are reported in the wild at the time of publication, the nature of buffer overflows and the exposure of routers to internet-facing networks make this a significant concern. The lack of a CVSS score means severity must be assessed based on the potential impact and exploitability. The vulnerability does not specify whether authentication is required, but given it involves a web parameter, it could be exploitable remotely if the management interface is exposed. No patches or mitigations are currently linked, indicating that affected users should be vigilant and monitor for vendor updates. The Tenda AC6 is a consumer-grade router widely used in various markets, including Europe, for home and small office internet connectivity. The vulnerability could be leveraged by attackers to gain control over network traffic, intercept data, or pivot into internal networks.

For European organizations, especially small businesses and home offices relying on Tenda AC6 routers, this vulnerability poses a risk of unauthorized access and control over network infrastructure. Successful exploitation could lead to interception of sensitive communications, disruption of internet connectivity, or use of compromised routers as a foothold for further attacks within corporate or residential networks. Given the router's role as a gateway device, compromise could impact confidentiality by exposing internal traffic, integrity by manipulating network configurations, and availability by causing device crashes or network outages. The impact is heightened in environments where these routers are used without additional network segmentation or security controls. Critical infrastructure or organizations with remote workers using vulnerable devices at home may face increased risk. The absence of known exploits reduces immediate threat but does not eliminate the risk, as attackers often develop exploits after vulnerability disclosure. The potential for remote exploitation without authentication (if applicable) increases the threat level for exposed devices.

European organizations and users should immediately verify if their Tenda AC6 routers are running firmware version V15.03.05.19 or earlier. Until an official patch is released, users should restrict access to the router's management interface by disabling remote management features and ensuring that the interface is only accessible from trusted internal networks. Changing default credentials and using strong, unique passwords is essential to prevent unauthorized access. Network segmentation should be implemented to isolate vulnerable devices from critical systems. Monitoring network traffic for unusual activity and employing intrusion detection systems can help identify exploitation attempts. Users should subscribe to Tenda's security advisories and apply firmware updates promptly once available. Additionally, consider replacing vulnerable devices with models that have a strong security track record if patching is delayed. For organizations, deploying network-level protections such as firewall rules to block unsolicited inbound traffic to router management ports can reduce exposure.