Do you provide both internal and external network penetration testing?

Yes. External network penetration testing assesses internet-facing assets such as firewalls, VPN gateways, exposed services, and public IP addresses. Internal penetration testing simulates a threat actor inside the network and evaluates privilege escalation, lateral movement, and access to critical assets.

Do you test Active Directory and lateral movement risks?

Yes. Active Directory assessments are a core component of internal network penetration testing. We evaluate risks such as Kerberoasting, AS-REP roasting, NTLM relay attacks, ACL misconfigurations, Group Policy abuse, privilege escalation paths, and lateral movement opportunities.

What’s the difference between internal and external network penetration testing?

External penetration testing simulates attacks originating from the internet against publicly exposed systems. Internal penetration testing simulates an attacker who already has network access and focuses on privilege escalation, lateral movement, Active Directory weaknesses, and access to sensitive systems.

Do you test for internal threats and post-compromise scenarios?

Yes. We simulate post-compromise scenarios to evaluate how attackers could escalate privileges, move laterally across systems, and gain access to sensitive resources. This helps identify weaknesses in internal trust relationships and access controls.

What kind of risks can network penetration testing uncover?

Network penetration testing can uncover weak credentials, unpatched systems, insecure protocols, exposed services, firewall misconfigurations, segmentation weaknesses, and other security gaps that attackers commonly exploit to gain deeper access into an environment.

4.9on G2

Network Penetration Testing Services

Q: What is network penetration testing?

Network penetration testing simulates real-world attacks against network infrastructure to uncover vulnerabilities before attackers exploit them. It evaluates external-facing systems and internal networks by validating exploitability and demonstrating real business impact rather than simply listing theoretical vulnerabilities.

Q: Is network penetration testing different from vulnerability scanning?

Yes. Vulnerability scanning is automated and identifies known weaknesses, while network penetration testing is a hands-on assessment that validates exploitability, chains vulnerabilities, abuses misconfigurations, and demonstrates real-world business impact.

Protect critical infrastructure and stop lateral movement by simulating real-world intrusions, from the internet and from inside your network.

Book a call Send us a message

When FICO needed security services, I immediately turned to them. Their expertise, efficiency, and thoroughness continue to impress.Hilik Kotler, CISO, FICO

What an attacker can actually reach, not a list of CVEs.

External testing targets what the internet can see: firewalls, VPNs and public-facing services. Internal testing assumes an attacker is already inside, through a compromised laptop or stolen credentials, and shows how far they could go.

Our testers chain vulnerabilities, validate exploitability and abuse misconfigurations, so the report shows real business impact rather than theoretical risk.

Penetration testing, done properly.

Expert ethical hackersExperienced security professionals with deep expertise in offensive security.
Advanced hybrid testingStrategic automation for common issues, manual deep-dive testing for the hard-to-find ones.
Tailored to your environmentEvery test is customized, so results are accurate and relevant.
Actionable insightsA report with prioritized remediation steps your engineers can act on.
Fast turnaroundComprehensive results without long waits, so you can act quickly.
Testers you can talk toKickoff, status updates and a post-assessment review, with testers on hand to clarify findings.
Results on our platformTrack status, manage remediation and see analytics on findings in one place.
Fixed scope, fixed priceOne clear quote upfront. No change orders mid-test.

How a network pentest runs.

Scope, test, report, retest: agreed with your team before we start.

Scope

Scope and attack surface mappingWe map your perimeter and internal ranges: hosts, services, trust relationships and segmentation boundaries.
Discovery and reconnaissanceWe enumerate exposed services, domains and identities to find the most likely entry points.

Test

Automated and manual testingAutomated scanning, then manual testing of services, protocols, credentials, Active Directory and segmentation controls.
Exploitation and attack simulationWe exploit entry points and escalate privileges to prove impact, from an external foothold or a standard user toward domain admin.
Post-exploitation and risk analysisWe map lateral movement to high-value systems and rank each path by business risk.

Report

Reporting and remediation guidanceFindings ranked by risk, with clear, prioritized remediation steps your engineers can act on.

Fix and keep going

RetestingOnce fixes are in, we retest to confirm each finding is closed.
PT as a ServiceFor ongoing protection, continuous penetration testing through our PTaaS program.

External or internal testing?

External network test

Simulates an attack from the internet on your exposed assets.

Firewalls, VPN gateways, public IPs and exposed services.

Internal network test

Simulates an attacker already inside your network.

Privilege escalation, lateral movement and Active Directory weaknesses.

Most organizations need both: one shows how attackers get in, the other how far they could go.

What network penetration testing does for your business.

Harden your perimeterClose the entry points remote attackers look for first.
Stop lateral movementFind the paths that turn one compromised machine into a full breach.
Secure Active DirectoryThe most common pivot point in enterprise breaches, tested in depth.
Validate segmentationProve that sensitive networks are really separated.
Meet compliance requirementsEvidence for PCI DSS, SOC 2, ISO 27001 and customer reviews.

Why teams choose GRSee for network penetration testing.

We truly enjoyed working with you and highly recommend your services to anyone looking for professionalism and excellence in cybersecurity.Kobi Lechner, Co-Founder and COO, Rescana

Adversary-driven testingWe replicate how attackers move from entry points to sensitive systems.
Active Directory focusKerberoasting, relay paths, ACL and GPO abuse, and privilege escalation.
Impact, not CVE listsValidated, chained findings with prioritized remediation.

Related services

Book a call

4.9on G2

Network pentest guides from our team.

All resources

Network pentest questions, answered.

Still not sure? Bring your questions to a scoping call.

What is network penetration testing?

It simulates real-world attacks on your external and internal infrastructure (firewalls, routers, servers, endpoints, services and protocols), chaining vulnerabilities to show real business impact rather than theoretical CVEs.

Do you test both internal and external networks?

Yes. External testing covers your internet-facing perimeter. Internal testing simulates an attacker already inside and maps paths to escalate privileges, move laterally and reach critical assets.

Do you test Active Directory and lateral movement?

Yes. Active Directory is the most common pivot point in enterprise breaches. We assess Kerberoasting, AS-REP roasting, NTLM relay paths, ACL misconfigurations, GPO abuse and privilege escalation toward domain admin.

Is network penetration testing different from vulnerability scanning?

Yes. Scanning lists known CVEs, often with false positives. Pentesting is hands-on: testers chain vulnerabilities, validate exploitability and demonstrate what attackers can actually achieve.

What risks can a network pentest uncover?

Weak credentials, unpatched systems, insecure protocols, exposed services, firewall misconfigurations and segmentation gaps, the entry points and pathways attackers use for deeper compromise.

How often should penetration tests be conducted?

At least annually, and after major system updates, infrastructure changes or security incidents. High-risk industries may need more frequent testing.

Will testing disrupt our operations?

Testing is planned to minimize disruption. We coordinate timing, use controlled methods, and can test staging or development environments instead of production if you prefer.

Do you retest after we fix the findings?

Yes. We retest to verify that vulnerabilities have been properly remediated before findings are closed.

Book your scoping call.

Pick a time that suits you. You leave with a scope and a fixed quote.

Testers you can talk to
A retest after you fix
Results on our platform

Local teams, your time zone

United States
Europe
Middle East

We work in your time zone and support you in multiple languages.

4.9on G2

Loading the booking form

Times are shown in your own time zone.

Booking form not showing?Open it in a new tab