With the increasing concern for security in the network, many approaches are laid out that try to protect the network from unauthorised access. New methods have been adopted in order to find the potential discrepancies that may damage the network. Most commonly used approach is the vulnerability assessment. By vulnerability, we mean, the potential flaws in the system that make it prone to the attack. Assessment of these system vulnerabilities provide a means to identify and develop new strategies so as to protect the system from the risk of being damaged. This paper focuses on the usage of various vulnerability scanners and their related methodology to detect the various vulnerabilities available in the web applications or the remote host across the network and tries to identify new mechanisms that can be deployed to secure the network.