It works fine on my environment. ( CentOS5, non-root user)
I want to reproduce the issue. Let me know your OS version of the target server.

Please update to the latest version, and run with --debug option to get more information.

user for ssh

Vuls supports non-root user for ssh user.
You have to define NOPASSWD in /etc/sudoers on the target server if you use non-root user.
For details, see https://github.com/future-architect/vuls#usage-configtest

• CentOS, Amazon Linux, RedHat Enterprise Linux

vuls ALL=(root) NOPASSWD: /usr/bin/yum

• Ubuntu, Debian

vuls ALL=(root) NOPASSWD: /usr/bin/apt-get, /usr/bin/apt-cache

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I reproduced the problem on CentOS7 (without -ssh-external).
I will fix it soon :)

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The bug was fixed.
Please test on your environment.
Thanks for reporting :)

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