Here some of the popular vulnerability vendor database. https://vuldb.com https://cve.mitre.org Now it is https://nvd.nist.gov/ https://www.securityfocus.com/bid/ https://exchange.xforce.ibmcloud.c https://www.exploit-db.com http://www.openvas.org https://www.securitytracker.com EOF http://www.osvdb.org EOF
