This paper describes the project and implementation of a vulnera-bility search and alert system based on free software. SisBrAV (acronym in Portuguese for Brazilian Vulnerability Alert System), will consist in a spider mechanism that explores several security-related sites for information on vulnerabilities and an intelligent interpreter responsible for analyzing and sorting the relevant data, feeding it into a database. With that information in hands, an email notifier sends out alerts, in Portuguese, about new vulnerabili-ties to registered clients, according to the operating systems and services run in their environment. In addition to the email notifier, a web server will also be implemented, for systems administrators to perform an on-demand custom search in the vulnerabilities database.