The web interface of the affected devices processes a cookie value improperly, leading to a stack buffer overflow. More precisely, giving too long character string to MFPSESSIONID parameter results in a stack buffer overflow. As for the details of affected product names, model numbers, and versions, refer to the information provided by the respective vendors listed under [References].
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).