CVE-2025-15460 is a buffer overflow vulnerability identified in the UTT 进取 520W router firmware version 1.7.7-180627. The vulnerability is located in the handling of the EncryptionMode parameter within the /goform/formPptpClientConfig function, which uses the unsafe strcpy function without proper bounds checking. This allows an attacker to send a specially crafted request to the router’s web interface, causing a buffer overflow condition. Because the vulnerability is remotely exploitable without authentication or user interaction, an attacker can potentially execute arbitrary code on the device, leading to full compromise. The vulnerability affects the confidentiality, integrity, and availability of the device and the network it supports. The vendor was contacted early but did not respond or provide a patch, and a public exploit has been released, increasing the risk of exploitation. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P) indicates network attack vector, low complexity, no authentication, and high impact on all security properties. The device is typically used in network environments requiring VPN connectivity, making it a critical point of failure if compromised.

For European organizations, exploitation of this vulnerability could lead to unauthorized remote control over affected routers, enabling attackers to intercept, modify, or disrupt network traffic. This could result in data breaches, loss of network availability, and potential lateral movement within corporate networks. Critical infrastructure, government agencies, and enterprises relying on UTT 进取 520W devices for VPN or secure communications are particularly at risk. The lack of vendor response and patch availability increases exposure time, while the public exploit availability lowers the barrier for attackers. Compromise of these devices could also facilitate persistent footholds for espionage or sabotage, impacting confidentiality and operational continuity. The vulnerability’s remote and unauthenticated nature means attackers can target these devices from anywhere, increasing the threat surface for European entities.

Since no official patch is available, European organizations should immediately identify and isolate all UTT 进取 520W devices running vulnerable firmware. Network segmentation should be enforced to limit access to these devices, especially restricting inbound traffic to the /goform/formPptpClientConfig endpoint. Disabling or restricting PPTP client configuration interfaces if not required can reduce attack vectors. Employ intrusion detection and prevention systems (IDS/IPS) with signatures for known exploit attempts targeting this vulnerability. Regularly monitor network traffic and logs for anomalous activity related to the EncryptionMode parameter or unexpected POST requests to the vulnerable endpoint. Consider deploying web application firewalls (WAF) to filter malicious payloads. Where possible, replace vulnerable devices with updated or alternative hardware from vendors with active security support. Engage with UTT or third-party security providers for potential unofficial patches or mitigations. Maintain up-to-date backups and incident response plans to quickly recover from potential compromises.