Apache HTTP Server is open-source web server software used to deliver websites, APIs, and application content. It often sits at the edge of a network, handling requests before they reach backend services, and it can also act as a reverse proxy or support dynamic content through modules.
In cyber security, Apache matters because a single exposed instance can become a high-value target. Attackers look for outdated versions, vulnerable modules, weak configuration, or features that expand the attack surface. Defenders focus on inventory, patching, and verifying vendor backports, because a package may appear current while still needing a security update. When flaws are critical, the concern is often remote code execution or service compromise, so internet-facing servers should be checked first. Secure deployment means knowing exactly which build is running, which modules are enabled, and whether the fix is truly present.