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Description
HMS Networks Ewon Flexy with firmware before 15.0s4, Cosy+ with firmware 22.xx before 22.1s6, and Cosy+ with firmware 23.xx before 23.0s3 have weak entropy for authentication cookies, allowing an attacker with a stolen session cookie to find the user password by brute-forcing an encryption parameter.
References
www.hms-networks.com/p/flexy20500-00ma-ewon-flexy-205
hmsnetworks.blob.core.windows.net/....pdf?sfvrsn=f7c027b8_13