CVE-2025-15215 is a buffer overflow vulnerability identified in the Tenda AC10U router firmware versions 15.03.06.48 and 15.03.06.49. The vulnerability resides in the formSetPPTPUserList function, which processes HTTP POST requests at the /goform/setPptpUserList endpoint. Specifically, the vulnerability arises from improper validation and handling of input parameters, allowing an attacker to overflow a buffer by manipulating the argument list. This buffer overflow can lead to memory corruption, enabling remote attackers to execute arbitrary code or cause a denial of service condition on the device. The attack vector is network-based, requiring no authentication or user interaction, which significantly lowers the barrier to exploitation. The vulnerability has been publicly disclosed, although no active exploitation has been reported to date. The CVSS 4.0 score of 8.7 indicates a high severity, with critical impacts on confidentiality, integrity, and availability. The vulnerability affects a widely deployed consumer and small business router model, which is often used in home and office environments, making it a significant security concern. The lack of available patches at the time of disclosure necessitates immediate mitigation efforts by users and administrators.

The exploitation of CVE-2025-15215 can have severe consequences for organizations and individuals using Tenda AC10U routers. Successful exploitation allows remote attackers to execute arbitrary code, potentially gaining full control over the affected device. This can lead to unauthorized network access, interception or manipulation of network traffic, and pivoting to other internal systems. Additionally, attackers could cause denial of service by crashing the device, disrupting network availability. Given the router’s role as a gateway device, compromise can undermine the security posture of the entire network, exposing sensitive data and critical infrastructure. The ease of remote exploitation without authentication increases the risk of widespread attacks, especially in environments where these routers are deployed without adequate network segmentation or monitoring. The public disclosure of the exploit details further elevates the threat, as it enables attackers to develop and deploy exploits rapidly. Organizations relying on these devices for VPN or remote access functions are particularly at risk, as the vulnerability is located in the PPTP user list management function.

To mitigate CVE-2025-15215, organizations should immediately assess their network for the presence of Tenda AC10U routers running the affected firmware versions 15.03.06.48 and 15.03.06.49. Since no official patches are currently available, interim measures include disabling remote management interfaces and restricting access to the router’s administrative functions to trusted internal networks only. Network segmentation should be enforced to isolate vulnerable devices from critical assets. Monitoring network traffic for unusual POST requests to /goform/setPptpUserList can help detect exploitation attempts. Implementing intrusion detection or prevention systems with custom signatures targeting this endpoint is recommended. Organizations should also consider replacing affected devices with models that have received security updates or have a better security track record. Regularly checking for firmware updates from Tenda and applying them promptly once available is critical. Additionally, educating users about the risks of using outdated firmware and encouraging secure configuration practices will reduce exposure.