A high-severity vulnerability has been discovered in 4G-based wireless 4GEE Mini modem sold by mobile operator EE. The vulnerability can be exploited by a low privileged user account to escalate privileges on any Windows computer that had once connected to the EE Mini modem via USB. This, in turn, would allow an attacker to gain full system access to the targeted remote computer and thereby, perform any malicious actions, such as installing malware, rootkits, keylogger, or stealing personal information.
Source: https://thehackernews.com/2018/09/4g-ee-wifi-modem-hack.html