The Wifi hotspot in Lenovo SHAREit before 3.5.48ww for Android, when configured to receive files, does not require a password, which makes it easier for remote attackers to obtain access by leveraging a position within the WLAN coverage area.
Lenovo SHAREit before 3.2.0 for Windows and SHAREit before 3.5.48ww for Android transfer files in cleartext, which allows remote attackers to (1) obtain sensitive information by sniffing the network or (2) conduct man-in-the-middle (MITM) attacks via unspecified vectors.