Network Infrastructure and Internal Systems Penetration Testing

Network Infrastructure and Internal Systems Penetration Testing

We test the security of internal and external network infrastructure by simulating real-world cyberattacks. Our certified ethical hackers assess the resilience of firewalls, VPNs, Active Directory, servers, network devices, Wi-Fi networks, and industrial systems (OT/ICS) against unauthorized access, privilege escalation, lateral movement, and other security threats. Every finding is manually verified and accompanied by specific recommendations to improve the security of your network infrastructure.

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Network Infrastructure and Internal Systems Penetration Testing

Why Test Network Infrastructure and Internal Systems?

Network infrastructure is the foundation of an organization’s IT environment. It connects servers, workstations, cloud services, databases, and user accounts. If an attacker gains access to the internal network or compromises Active Directory, they may be able to move between systems, escalate privileges, and gain access to sensitive organizational data. Penetration testing simulates real-world attack scenarios and verifies whether configuration errors, weak passwords, misconfigured permissions, or insufficient network segmentation can be exploited. Our ethical hackers combine automated tools with manual testing to assess the actual impact of every identified vulnerability. Regular penetration testing helps organizations reduce the risk of internal network compromise, protect critical systems, and support compliance with standards and regulations such as NIS2, DORA, ISO 27001, and PCI DSS.

Protection of Critical Systems

We identify vulnerabilities that could lead to the compromise of servers, Active Directory, databases, or other critical systems within the organization.

Prevention of Lateral Movement

We assess whether an attacker who gains initial access can escalate privileges or move laterally between systems within the network.

Support for Security Compliance

Penetration testing results support compliance with NIS2, DORA, ISO 27001, PCI DSS, and other security standards and requirements.

Greater Infrastructure Resilience

Regular testing helps identify weaknesses before attackers can exploit them and improves the overall cybersecurity posture of the organization.

What Network Infrastructure Penetration Testing Can Reveal

Network infrastructure penetration testing goes beyond identifying individual technical vulnerabilities. It also assesses how multiple weaknesses can be combined to gain unauthorized access to the internal network, compromise critical systems, or expand an attack across the organization. Common findings include:

Weak, reused, or compromised passwords can allow attackers to gain initial access to the internal network, user accounts, or critical systems.

Misconfigured systems and permissions can allow attackers to increase their level of access and obtain administrative or other privileged permissions.

We assess whether an attacker who has compromised one device or account can move between other systems and progressively expand their access across the network.

Misconfigured firewalls, routers, network services, or access rules can expose systems and services to unauthorized users.

Inadequate separation between network segments can allow attackers to access systems that should not be reachable from a compromised part of the network.

Legacy protocols, weak authentication, or misconfigured internal services can provide additional opportunities to compromise infrastructure or expand an attack.

Weaknesses in Active Directory configuration, Kerberos, delegation, or account management can lead to the compromise of domain accounts and, in severe cases, the entire domain.

A combination of vulnerabilities and misconfigured permissions can allow attackers to access servers, databases, and other critical systems within the organization.

Insecure Wi-Fi configurations, weak authentication, or access point misconfigurations can allow unauthorized users to connect to the corporate network.

Weak authentication, misconfiguration, or insufficiently protected VPN accounts can allow attackers to gain remote access to internal infrastructure.

Misconfigured network rules can allow communication between network segments that should be isolated from each other for security reasons.

Misconfigured permissions, delegation, or relationships between accounts and groups can allow attackers to escalate privileges and potentially gain access to privileged domain accounts.

Internal services unintentionally exposed to the internet can provide attackers with an entry point into the infrastructure and expose systems that should not be publicly accessible.

Free Report

Discover What Hundreds of Real-World Penetration Tests Reveal

Network infrastructure and internal systems are critical components of every organization's security. Download our free Ethical Hacking Report 2025 and discover what we found across 628 penetration tests and an analysis of 3,293 identified vulnerabilities in Citadelo projects.

  • The most common vulnerabilities found in real-world security projects
  • How vulnerabilities have evolved compared to 2024
  • Analysis of network infrastructure, web applications, APIs, cloud environments, and AI
  • Practical recommendations from experienced ethical hackers
Download the Free Report

Choose Your Penetration Testing Type

Penetration Testing

Penetration testing (pentesting) simulates real-world cyberattacks to identify vulnerabilities before attackers can exploit them. Learn how penetration testing works, what types of pentests we perform, what you receive after the test, and how we help you reduce cybersecurity risks.

Learn about pentesting

Web Applications

We test web applications against attacks such as SQL Injection, Cross-Site Scripting (XSS), authentication flaws, and privilege escalation. Our web application penetration testing follows the OWASP Web Security Testing Guide and OWASP Top 10.

Learn about web testing

Mobile Applications

Mobile application penetration testing for Android and iOS assesses the security of sensitive data, APIs, server communication, local storage, and the application's resilience against reverse engineering, rooting, jailbreaking, and other attack techniques.

Learn about mobile apps

AI and LLM Systems

We test the security of AI applications, chatbots, AI agents, and RAG systems. AI penetration testing assesses resilience against prompt injection, jailbreak attacks, sensitive data leakage, model manipulation, and abuse of external tools based on the OWASP Top 10 for LLM Applications.

Learn about AI & LLMs

Cloud Environments

We assess the security of AWS, Microsoft Azure, and Google Cloud Platform (GCP) environments by simulating real-world attacks. Cloud penetration testing covers IAM, cloud storage, Kubernetes, network rules, and exposed services.

Learn about cloud testing

APIs and Microservices

API and microservices penetration testing assesses the security of REST, GraphQL, and other APIs, including communication between microservices. We test OAuth, JWT, API gateways, authorization, input validation, and API resilience based on the OWASP API Security Top 10.

Learn about APIs

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