EXTERNAL NETWORK PENETRATION TESTING
External network penetration testing: see your company as an internet attacker sees it
Network perimeter testing from the internet side, run by OSCP-certified pentesters. We find exposed services, forgotten systems and the vulnerabilities that are the first target of a real attack.
WHY IT MATTERS
An attack almost always starts with what you have exposed to the internet
Your perimeter is the first thing an attacker sees and probes. One forgotten server, an unprotected admin panel or an unpatched VPN service is enough to provide a way into your network.
Something we have seen: beyond the main systems we found a test server with a login panel and default credentials. No one remembered it, yet it was a simple route into the internal network. The most dangerous thing is often what the organization forgot.
WHAT WE CHECK
The whole attack surface from the internet side
We test black-box, from the perspective of a real attacker with no knowledge of the environment.
OUR APPROACH
We do not scan, we confirm real impact
A list of open ports is not the result of a test, it is its start. The value appears when a pentester confirms a vulnerability is genuinely exploitable and shows where it leads, instead of leaving raw scanner output.
We work to PTES and NIST SP 800-115, combining reconnaissance with controlled exploitation. So you know not only what you have exposed, but what of it genuinely threatens your network.
COMPLIANCE
A test explicitly required by regulation
Regular perimeter testing is a standard part of compliance and risk management.
STANDARDS & CERTIFICATIONS
We work to recognized methodologies, not gut feeling
Every project is run by certified pentesters and based on public standards. That makes the result repeatable, auditable and comparable across vendors.
We share the full list of certifications and standards on request, together with a sample test scope.
HOW WE DO IT
A repeatable process based on PTES
EVIDENCE
Numbers behind every promise
Every test is run by certified pentesters, and we document the result with reproduction steps, evidence and a verified remediation path. Proof, not a promise.
KNOWLEDGE
External network penetration testing in practice
Why the perimeter is the attacker first target
An attack almost always starts with what you have exposed to the internet. An external network test looks at the company through the eyes of an attacker with no internal access and checks everything that is publicly reachable: servers, services, login panels, VPNs and forgotten systems that often no one remembers anymore.
The most common cause of a breach is not a sophisticated exploit but one forgotten host, an outdated service or a weak password on an admin panel exposed to the network. That is why we start with thorough reconnaissance and mapping of the whole surface, not from a single address you handed over.
What makes up the attack surface from the outside
The attack surface is not just your main domain. It is made up of subdomains, test environments accidentally exposed to the internet, services on non-standard ports, certificates that reveal further names and data leaking from public sources. We map all of it so the test covers the real reach, not only the obvious.
We then verify every discovered service for known vulnerabilities, misconfiguration and weak authentication mechanisms. We confirm every potential entry in practice, separating real risk from the noise that automated scanners generate.
How the test differs from an automated perimeter scan
An automated perimeter scan returns a list of open ports and known signatures, usually with a high number of false positives. A penetration test goes further: the pentester verifies every hypothesis by hand, combines individual flaws into a real path and confirms what can actually be achieved from the internet.
This difference is crucial, because regulations and clients do not ask how many open ports you have, but whether someone from the outside can break in. That question is only answered by a person who tries to do it in a controlled way.
What you get in the report
The report contains every vulnerability with proof, a risk rating and reproduction steps, plus a clear indication of which systems are the most urgent problem. On top of that we add an executive summary and remediation priorities ordered by real risk, not the CVSS number alone.
After fixes are implemented we run a retest and confirm in writing that the gap is closed. A perimeter test often also reveals forgotten assets, so the report helps you put in order what you really have exposed to the network.
How often to test the external network
The perimeter changes constantly: new services appear, old ones disappear, new vulnerabilities emerge in software that was safe yesterday. That is why we recommend a regular testing cycle rather than a one-off check, plus an additional test after every major infrastructure change.
Preparation on your side is minimal. All we need is a list of the address ranges and domains in scope plus the agreed rules, and we take the reconnaissance, verification and report on ourselves.
FAQ
Common questions
What do we need to prepare?
How is this different from a vulnerability scan?
How often should the test be repeated?
Is the retest included?
RELATED
Related reading
CASE STUDIES
Case studies in this area
REFERENCES
“The project was delivered professionally and on time, with a strong grasp of both technology and business. We were impressed by their cybersecurity expertise and partnership approach.”
