The sessions are stored in clear-text logs. An attacker can retrieve authentication sessions. A remote attacker can retrieve the credentials and bypass the authentication mechanism. As for the affected products/models/versions, see the reference URL.
Information written to log files can be of a sensitive nature and give valuable guidance to an attacker or expose sensitive user information.
While logging all information may be helpful during development stages, it is important that logging levels be set appropriately before a product ships so that sensitive user data and system information are not accidentally exposed to potential attackers. Different log files may be produced and stored for: