CVE-2025-15216 is a stack-based buffer overflow vulnerability identified in the Tenda AC23 router firmware version 16.03.07.52. The vulnerability resides in the fromSetIpMacBind function, specifically in the handling of the bindnum parameter within the /goform/SetIpMacBind endpoint. Improper validation or bounds checking of this argument allows an attacker to overwrite the stack memory, potentially leading to arbitrary code execution. The vulnerability is remotely exploitable without requiring authentication or user interaction, as the affected endpoint is accessible over the network. The CVSS 4.0 base score is 8.7, reflecting high severity due to the ease of exploitation and the critical impact on confidentiality, integrity, and availability. Although no known exploits have been reported in the wild, a public exploit is available, which could facilitate attacks by malicious actors. This vulnerability could allow attackers to take full control of the router, intercept or manipulate network traffic, and pivot to internal networks. The lack of patches or official mitigation guidance at the time of publication increases the urgency for organizations to implement protective measures. The vulnerability affects a widely used consumer and small business router model, which may be deployed in various environments, including home offices and enterprise edge networks.

The impact of CVE-2025-15216 is significant for organizations worldwide using Tenda AC23 routers. Exploitation can lead to remote code execution, enabling attackers to gain full control over the device. This compromises network confidentiality by allowing interception or redirection of data, integrity by enabling manipulation of network traffic or device configurations, and availability by potentially causing device crashes or denial of service. Compromised routers can serve as footholds for lateral movement within corporate networks or as launch points for further attacks. Small and medium enterprises relying on these routers for perimeter security are particularly vulnerable. Additionally, home users with remote management enabled may inadvertently expose their networks to attackers. The availability of a public exploit increases the likelihood of exploitation attempts, potentially leading to widespread compromise if not addressed promptly.

To mitigate CVE-2025-15216, organizations should first verify if they are using Tenda AC23 routers with firmware version 16.03.07.52. Immediate steps include disabling remote management interfaces to reduce exposure to external attackers. Network segmentation should be employed to isolate vulnerable devices from critical assets. Monitoring network traffic for unusual activity targeting the /goform/SetIpMacBind endpoint can help detect exploitation attempts. If official patches become available, they should be applied promptly. In the absence of patches, deploying Web Application Firewalls (WAFs) or Intrusion Prevention Systems (IPS) with custom rules to block malformed requests containing suspicious bindnum parameters can provide interim protection. Regular firmware updates and vendor advisories should be monitored closely. Additionally, organizations should conduct internal audits to identify and replace vulnerable devices where feasible, and educate users on the risks of enabling remote management features without adequate security controls.