Vulnerability scanners find problems. A firewall prevents them.
A vulnerability scanner tells you what's wrong with dependencies you've already pulled. A dependency firewall decides what enters your environment in the first place. Instead of pulling blindly from public registries, every request is proxied through the firewall – where policy controls what's permitted, threat intelligence flags malicious packages that scanners never see, and enforcement happens at the earliest possible point. Scanning what's already inside is too late.
