Proof-of-concept (PoC) code is a small program or script that shows a vulnerability can be triggered in a real system. It is usually written to prove that a bug exists, reproduce a crash, or demonstrate an unsafe behavior such as unauthorized access, input handling failure, or command execution.
In cyber security, PoC code matters because it changes a flaw from a theory into something others can test. Defenders use it to validate exposure, confirm whether a patch works, and understand which conditions are required for exploitation. Attackers may also use public PoC code as a starting point for scanning, weaponization, or building more reliable exploits. A public PoC does not mean a system is actively compromised, but it does increase urgency: if the vulnerable product is exposed, reachable, and unpatched, the risk is higher and easier to assess.