Infrastructure
External penetration testing
External penetration testing examines the systems reachable from the internet: VPNs, remote access, web services, cloud edges, exposed admin panels and forgotten assets that attackers can find before you do.
What external testing covers
A useful external test goes beyond a port scan. It validates exposed services, authentication surfaces, TLS posture, known vulnerabilities, cloud edges and misconfigurations that create a path inward.
How to scope the perimeter
Start with known domains, IP ranges, cloud accounts and third-party-hosted systems. Add certificate transparency, DNS and asset discovery so forgotten hosts are not missed.
- Corporate domains and subdomains
- Cloud-hosted public services
- VPN, SSO, mail, file transfer and remote access portals
- Admin panels and non-production environments
What the report should prove
The report should separate verified exploitable issues from hygiene observations, explain business impact, and give remediation that infrastructure teams can actually implement.
FAQ
Common questions
Do you need credentials for external testing?
Not always. External testing often starts unauthenticated, but credentials may be useful for portals, VPNs or admin surfaces in scope.
Can external testing include cloud assets?
Yes. Internet-facing cloud services are often part of external infrastructure testing.
Will external testing cause downtime?
Testing is scoped to avoid disruptive techniques unless they are explicitly approved in the rules of engagement.