CXSECURITY.COM Free Security List(https://cxsecurity.com/)CXSECURITY (Independent information about security) is a huge collection of information on data communications safety. Its main objective is to inform about errors in various applications.

CVE security vulnerability database. Security vulnerabilities(https://www.cvedetails.com/)CVEdetails.com is a free CVE security vulnerability database/information source. You can view CVE vulnerability details, exploits, references, metasploit modules, full list of vulnerable products and cvss score reports and vulnerability trends over time

CVE(http://cve.mitre.org/)CVE® is a list of records — each containing an identification number, a description, and at least one public reference — for publicly known cybersecurity vulnerabilities. The mission of the CVE Program is to identify, define, and catalog publicly disclosed cybersecurity vulnerabilities.