CVE-2025-11526 is a stack-based buffer overflow vulnerability identified in the Tenda AC7 router firmware version 15.03.06.44. The vulnerability resides in an unspecified function associated with the /goform/WifiMacFilterSet endpoint, which processes the wifi_chkHz parameter. Improper validation or bounds checking of this argument allows an attacker to overflow the stack buffer, potentially overwriting control data such as return addresses. This can lead to arbitrary code execution with elevated privileges on the device. The vulnerability is remotely exploitable over the network without requiring authentication or user interaction, making it highly accessible to attackers. The CVSS 4.0 base score is 8.7, reflecting high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges or user interaction needed. Although no known exploits in the wild have been reported, the public availability of exploit code increases the likelihood of exploitation attempts. The vulnerability affects a widely deployed consumer and small business router model, which is often used as a gateway device, thus compromising it can lead to broader network compromise. The lack of an official patch link in the provided data suggests that mitigation may currently rely on workarounds or vendor updates pending release. This vulnerability underscores the importance of secure input validation and memory management in embedded network devices.

The exploitation of CVE-2025-11526 can have severe consequences for organizations worldwide. Successful attacks can lead to full compromise of the affected Tenda AC7 routers, allowing attackers to execute arbitrary code with elevated privileges. This can result in unauthorized access to internal networks, interception or manipulation of network traffic, disruption of network services, and potential pivoting to other internal systems. Confidential data passing through the router can be exposed or altered, undermining data integrity and privacy. The availability of network connectivity may be disrupted, impacting business operations and critical services. Given that routers serve as the first line of defense and traffic control, their compromise can facilitate large-scale attacks such as man-in-the-middle, data exfiltration, or launching further attacks within the network. The remote, unauthenticated nature of the exploit increases the attack surface and risk, especially in environments where these devices are deployed without adequate network segmentation or monitoring. Organizations relying on Tenda AC7 devices in enterprise, SMB, or critical infrastructure contexts face elevated risks of operational disruption and data breaches.

To mitigate CVE-2025-11526, organizations should immediately verify if they are using Tenda AC7 routers with firmware version 15.03.06.44. If so, they should monitor the vendor’s official channels for firmware updates or patches addressing this vulnerability and apply them as soon as available. In the absence of an official patch, network administrators should restrict access to the router’s management interfaces, especially the /goform/WifiMacFilterSet endpoint, by implementing firewall rules or access control lists to limit exposure to trusted networks only. Disabling remote management features or changing default credentials can reduce the attack surface. Network segmentation should be enforced to isolate vulnerable devices from critical systems. Intrusion detection and prevention systems should be configured to detect anomalous requests targeting the wifi_chkHz parameter or unusual traffic patterns to the router. Regularly auditing router configurations and monitoring logs for suspicious activity can help identify exploitation attempts early. Additionally, organizations should consider replacing vulnerable devices with models that have a strong security track record if timely patching is not feasible. Educating staff about the risks of unpatched network devices and maintaining an asset inventory will support proactive vulnerability management.