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ZyXEL Modems Backup Telnet Account and Default Root Credentials
Information
Severity
Severity
Critical
Family
Family
Default Accounts
CVSSv2 Base
CVSSv2 Base
9.0
CVSSv2 Vector
CVSSv2 Vector
AV:N/AC:L/Au:S/C:C/I:C/A:C
Solution Type
Solution Type
Mitigation
Created
Created
6 years ago
Modified
Modified
5 years ago
Summary
ZyXEL PK5001Z and C1100Z modems have default root credentials set and a backdoor account with hard-coded credentials.
Insight
Insight
In February 2018 it was discovered that this vulnerability is being exploited by the 'DoubleDoor' Internet of Things (IoT) Botnet.
Detection Method
Detection Method
Connect to the telnet service and try to login with default credentials.
Solution
Solution
It is recommended to disable the telnet access and change the backup and default credentials.