A flaw in the Zyxel LTE3301-M209 firmware verisons prior to V1.00(ABLG.6)C0 could allow a remote attacker to access the device using an improper pre-configured password if the remote administration feature has been enabled by an authenticated administrator.
Zyxel CloudCNM SecuManager 3.1.0 and 3.1.1 allows attackers to discover accounts via MySQL "select * from Administrator_users" and "select * from Users_users" requests.