Cybersecurity and Infrastructure Security Agency (CISA) alerts provide timely information about current security issues, vulnerabilities, and exploits.[wp_rss_retriever url="https://www.cisa.gov/cybersecurity-advisories/all.xml" items="5" excerpt="50" read_more="true" credits="false" new_window="true" thumbnail="false" cache="1 hours"]
This is the Microsoft security update guide, which is posted regularly to address security vulnerabilities affecting Microsoft products and services
The NVD is the U.S. government repository of standards based vulnerability management data represented using the Security Content Automation Protocol (SCAP). This data enables automation of vulnerability management, security measurement, and compliance. The NVD includes databases of security checklist references, security-related software flaws, misconfigurations, product names, and impact metrics.
This is the RedHat product security center, where advisories and updates for RedHat Linux are posted
Common Vulnerabilities Exposure is a list of entries - each containing an identification number, a description, and at least one public reference - for publicly known cybersecurity vulnerabilities.