CVE-2025-15460 identifies a buffer overflow vulnerability in the UTT 进取 520W router firmware version 1.7.7-180627. The vulnerability arises from improper handling of the EncryptionMode parameter in the strcpy function within the /goform/formPptpClientConfig endpoint. strcpy is a C standard library function that copies strings without bounds checking, making it susceptible to buffer overflow if input exceeds the allocated buffer size. An attacker can remotely send a crafted request to this endpoint, manipulating the EncryptionMode argument to overflow the buffer. This overflow can corrupt adjacent memory, potentially allowing arbitrary code execution on the device. The vulnerability requires no authentication or user interaction, making it highly exploitable over the network. The vendor was contacted early but has not issued any patch or mitigation guidance. A public exploit has been released, increasing the risk of active 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 confidentiality, integrity, and availability. This vulnerability can lead to complete device compromise, enabling attackers to intercept or manipulate network traffic, disrupt services, or use the device as a foothold for further attacks.

The impact of CVE-2025-15460 is significant for organizations using the UTT 进取 520W router, especially in environments where these devices serve as critical network infrastructure. Successful exploitation can result in full device compromise, allowing attackers to execute arbitrary code remotely. This can lead to interception or manipulation of sensitive data, disruption of network services, and potential lateral movement within the network. Given the device’s role in routing and VPN client configuration (as indicated by the /goform/formPptpClientConfig endpoint), attackers could also manipulate VPN settings to intercept or redirect traffic. The lack of vendor response and availability of a public exploit increases the likelihood of exploitation in the wild. Organizations relying on this device without mitigations face risks of data breaches, service outages, and persistent network compromise. The vulnerability’s remote, unauthenticated nature broadens the attack surface, making it a critical concern for network security.

Since no official patch or vendor guidance is available, organizations should implement immediate compensating controls. First, restrict network access to the affected device’s management interfaces, especially blocking access to the /goform/formPptpClientConfig endpoint from untrusted networks. Deploy network-level intrusion detection and prevention systems (IDS/IPS) with signatures targeting this exploit to detect and block malicious payloads. Consider isolating or segmenting the device within the network to limit exposure. Monitor network traffic for unusual activity or signs of exploitation attempts. If possible, replace or upgrade the device to a more secure model or firmware version once available. Additionally, conduct regular vulnerability scans to identify affected devices and maintain an inventory of all UTT 进取 520W routers in use. Engage with the vendor persistently for patch release and stay updated on threat intelligence feeds for emerging exploits or mitigation techniques.