CVE-2025-11651 is a remotely exploitable buffer overflow vulnerability identified in the UTT 进取 518G device, specifically in firmware version V3v3.2.7-210919-161313. The vulnerability resides in the function sub_4247AC, which processes requests to the /goform/formRemoteControl endpoint. The issue arises from improper validation or sanitization of the 'Profile' argument, allowing an attacker to overflow a buffer and potentially execute arbitrary code or cause a denial of service. Exploitation requires no authentication or user interaction, increasing the attack surface. The vulnerability has a CVSS 4.0 base score of 8.7, indicating high severity, with network attack vector, low attack complexity, no privileges required, and no user interaction needed. The impact metrics show high confidentiality, integrity, and availability impacts, meaning successful exploitation could lead to full system compromise. Although the vendor was contacted early, no patch or mitigation guidance has been provided, and a public exploit has been disclosed, increasing the risk of active exploitation. The vulnerability affects a specific firmware version, so devices running this or earlier versions are vulnerable. The lack of vendor response and public exploit availability make this a critical issue for users of the UTT 进取 518G device.

For European organizations, the impact of CVE-2025-11651 can be severe. The vulnerability allows remote attackers to execute arbitrary code or cause denial of service on affected devices without authentication, threatening the confidentiality, integrity, and availability of systems relying on UTT 进取 518G devices. This can lead to unauthorized access to sensitive data, disruption of critical services, or use of compromised devices as footholds for lateral movement within networks. Organizations in sectors such as telecommunications, manufacturing, and critical infrastructure that deploy these devices may face operational disruptions and data breaches. The absence of a vendor patch increases the window of exposure, and the public exploit availability raises the likelihood of exploitation attempts. Additionally, compromised devices could be leveraged in botnets or other large-scale attacks, amplifying the threat beyond individual organizations. The impact is particularly significant for environments where these devices are exposed to untrusted networks or the internet.

Given the lack of an official patch, European organizations should implement immediate compensating controls. First, restrict network access to the vulnerable devices by implementing strict firewall rules and network segmentation to isolate UTT 进取 518G devices from untrusted networks, especially the internet. Disable or restrict remote management interfaces such as /goform/formRemoteControl to trusted IP addresses only. Employ intrusion detection and prevention systems (IDS/IPS) with signatures or heuristics to detect exploitation attempts targeting this vulnerability. Regularly monitor device logs and network traffic for anomalous activity indicative of exploitation. Where possible, replace or upgrade devices to versions not affected by this vulnerability or switch to alternative products with active vendor support. Establish incident response plans specifically addressing exploitation scenarios of this vulnerability. Engage with UTT or third-party security vendors for potential unofficial patches or mitigations. Finally, educate IT staff about the vulnerability and the importance of rapid response to exploitation attempts.