When the device is shared, the homepage module are before 2.19.0  in eWeLink Cloud Service allows Secondary user to take over devices as primary user via sharing unnecessary device-sensitive information.

Hard-coded Credentials in CoolKit eWeLlink app are before 5.4.x on Android and IOS allows local attacker to unauthorized access to sensitive data via Decryption algorithm and key obtained after decompiling app

Improper privilege management vulnerability in CoolKit Technology eWeLink on Android and iOS allows application lockscreen bypass.This issue affects eWeLink before 5.2.0.

Unconstrained Web access to the device's private encryption key in the QR code pairing mode in the eWeLink mobile application (through 4.9.2 on Android and through 4.9.1 on iOS) allows a physically proximate attacker to eavesdrop on Wi-Fi credentials and other sensitive information by monitoring the Wi-Fi spectrum during a device pairing process.

Weak encryption in the Quick Pairing mode in the eWeLink mobile application (Android application V4.9.2 and earlier, iOS application V4.9.1 and earlier) allows physically proximate attackers to eavesdrop on Wi-Fi credentials and other sensitive information by monitoring the Wi-Fi spectrum during the pairing process.