Security holds an important role in a software. Most people are not aware of the significance of security in software system and tend to assume that they will be fine without security in their software systems. However, the lack of security features causes to expose all the vulnerabilities possible to the public. This provides opportunities for the attackers to perform dangerous activities to the vulnerable insecure systems. This is the reason why many organizations are reported for being victims of system security attacks. In order to achieve the security requirement, developers must take time to study so that they truly understand the consequences and importance of security. Hence, this paper is written to discuss how secure software development can be performed. To reach the goal of this paper, relevant researches have been reviewed. Multiple case study papers have been studied to find out the answers to how the vulnerabilities are identified, how to eliminate them, when to implement security features, why do we implement them. Finally, the paper is concluded with final remarks on implementation of security features during software development process. It is expected that this paper will be a contribution towards the aforementioned software security domain which is often ignored during practical application.