Definitions

vishing: is making phone calls or leaving voice messages claiming to be from a reputable company or colleague in order to get you to reveal personal information, such as bank details and credit card numbers or passwords.  It's a combination of ‘voice’ and ‘phishing,’

Vulnerability is a weakness in an application, computing system, or network which can be exploited to perform unauthorized actions.

Vulnerability detection software is a service that scans an endpoint for current patch levels against a centralized database for known operating system and application vulnerabilities.