Internal and External Vulnerability Scans Answer Different Security Questions

Security teams often confuse external and internal vulnerability scans, though each reveals distinct risks. External scans test a client's public-facing systems, such as firewalls, VPN gateways, email servers, and websites, to show what any internet user could reach. Internal scans run from inside the network and assess workstations, servers, and devices to determine how far an intruder could move after gaining access. External scans typically produce fewer but more severe findings, while internal scans yield many more results that should be prioritized by risk. Experts recommend keeping both results in separate report sections with clear scope statements, and running external scans at least monthly and internal credentialed scans monthly.