Network Penetration Testing
Expose Weak Points Before Threat Actors Exploit Them
Is Your Network Really Secure?
A single open port. An outdated service. A misconfigured firewall rule. That’s all it takes for attackers to gain unauthorized access to your network—and from there, steal sensitive data or disrupt your entire system. Oppos Cybersecurity provides advanced network penetration testing services that simulate real-world attacks, helping your organization uncover security vulnerabilities across internal and external environments.
Our security professionals conduct targeted assessments to identify weaknesses in network configurations, access controls, connected devices, and exposed services. With deep expertise in both manual testing and automated scanning tools, we deliver the insights needed to strengthen your system security and maintain compliance.
What Happens When Attackers Get In?
Most cyber threats don’t start with advanced malware—they begin with overlooked network security issues. Weak firewall rules, exposed services, or outdated systems can be easy entry points for attackers. Once inside, even a moderately skilled threat actor can scan your environment, pivot between devices, and exploit multiple vulnerabilities to access sensitive information or shut down operations.
Our penetration testers mimic these tactics through controlled, simulated attacks designed to reveal how an adversary could gain access, move laterally, and avoid detection. We show you exactly what’s possible—before it happens for real.
A successful penetration test gives you more than a list of risks. It clearly shows how your network would stand up to real-world attacks and where to improve your defenses. Without it, you’re guessing. With Oppos, you’re ready.
Network Penetration Testing Process:
What Oppos Does Differently
Not all penetration testing services offer the same level of depth or accuracy. We take a precision-first approach to every network penetration test, combining proven methodologies with custom strategies based on your infrastructure.
Here’s how we stand apart:
Security Professionals With Real-World Testing Experience
Our penetration testers aren’t just certified—they’re experienced in simulating real-world attacks. They understand how to identify security vulnerabilities aligning with technical flaws and business risks. We follow recognized penetration testing standards while adapting to the unique needs of your environment.
Manual Testing Combined With Smart Automation
We use vulnerability scanners and port scanning tools to map your attack surface quickly, but we don’t stop there. Our team manually verifies each result to uncover security weaknesses that automation alone can’t catch, especially when it comes to chained exploits or business logic flaws.
Customized Approach to Testing
Our network penetration testing process is tailored to your infrastructure. Whether it’s internal networks, external IP addresses, wireless segments, or VPN entry points, we identify and test your highest-risk systems. Based on your threat model, we offer black box, gray box, and white box testing.
Testing the Effectiveness of Security Controls
Oppos doesn’t just look for low-hanging fruit. We test how your existing security systems respond to simulated attacks—firewalls, intrusion detection systems, segmentation rules, and more. This gives you an honest view of how well your controls actually work under pressure.
Clear Reporting for Key Stakeholders
We translate technical findings into actionable insights. Your network pen test report includes a detailed analysis of vulnerabilities, risk rankings, attack paths, and next steps. Whether you’re speaking to IT, compliance, or leadership, we help everyone understand what’s at stake—and what needs to happen next.
What We Test in Your Network
Our network penetration testing is designed to identify vulnerabilities across your entire infrastructure, not just the obvious entry points. We test how an attacker could exploit weak spots, move laterally, and access sensitive data. Each target system is selected based on risk, exposure, and business impact.
External-Facing Infrastructure
We assess systems exposed to the internet, like firewalls, VPN gateways, DNS, email, and web servers. These are often the first targets in a real-world attack. We use scanning tools, custom scripts, and manual techniques to uncover open ports, outdated services, and exploitable configurations.
Internal Network and Segmentation
If an attacker breaches your perimeter, what happens next? We test lateral movement across internal systems and evaluate the effectiveness of segmentation policies. This includes file servers, user endpoints, printers, and shared drives—all common points of privilege escalation.
Authentication and Access Controls
High-risk issues are weak authentication methods, exposed credentials, and misconfigured access controls. We assess how your network handles identity verification and whether it’s possible to gain unauthorized access to critical systems or other users’ data.
Wireless Networks and Connected Devices
From rogue access points to poorly secured IoT devices, wireless networks are a frequent blind spot. We test Wi-Fi security, encryption settings, and how easily attackers could connect and use that access to reach internal systems.
IP Addresses, Open Ports, and Protocols
Every open port is a potential doorway. We use port scanners to map active services and analyze traffic for weaknesses in communication protocols. Misconfigured or outdated services often present a path to exploitation.
Detection and Response Capabilities
It’s not just about gaining access—it’s also about what gets noticed. We observe how your systems respond to simulated attacks, including how logging, monitoring, and alerting tools detect (or miss) our attempts. This gives you insight into real-world detection gaps.
External vs Internal Network Testing—What’s the Difference?
External Network Penetration Testing
This test simulates a threat actor with no internal access, targeting public-facing infrastructure such as:
- Firewalls
- Web applications
- Email servers
- VPNs
- DNS servers
- Exposed IP addresses
We identify vulnerabilities that could allow an attacker to gain unauthorized access to your network, like open ports, outdated software, and misconfigured services. External testing is essential for protecting against cyber threats outside your organization.
Internal Network Penetration Testing
Internal testing assumes the perimeter has been breached. This may represent an insider threat, a successful phishing attack, or an infected endpoint. We simulate how an attacker would:
- Move laterally across internal systems
- Escalate privileges
- Access sensitive data
- Exploit shared drives, file servers, or poorly segmented networks
Internal network testing helps identify security holes that would otherwise go unnoticed, like misconfigured group policies, excessive permissions, and insufficient monitoring of internal activity.
Why You Need Both
Cyber threats can originate from anywhere—an external attacker or an employee’s compromised device. A successful penetration test should assess your security posture from multiple angles. Oppos helps you identify vulnerabilities on both fronts so you can confidently protect your systems, your users, and your data.
What You’ll Receive From a Network Pen Test
A network penetration test isn’t just a list of technical vulnerabilities—it’s a full security assessment that equips your team with the insight needed to fix real-world issues before they’re exploited.
When you work with Oppos, here’s what you can expect:
Comprehensive Network Pen Test Report
You’ll receive a detailed report that includes every step of the testing process—from reconnaissance to exploitation. Each finding is mapped to the relevant security risk and supported with screenshots, impact analysis, and remediation guidance.
Risk Findings Prioritized by Business Impact
We don’t just report vulnerabilities—we explain how each could be used to gain access, steal data, or compromise system security. Every issue is categorized by severity and risk to your business.
Vulnerability Breakdown and Exploitation Paths
See how our penetration testers exploited vulnerabilities in your systems. Whether it’s an open port, insecure operating system, or misconfigured access control, we show you the path we took—and how to close it.
Actionable Remediation Plan
Your team won’t be left guessing. Our reports include specific steps to fix each issue and references to best practices and common configuration standards.
Executive Summary for Key Stakeholders
We provide a high-level overview designed for leadership and compliance teams. It covers overall security posture, identifies security concerns, and recommends next steps to mitigate risk.
Optional Retesting and Validation
After remediation, we can perform a follow-up assessment to verify that all critical vulnerabilities have been addressed and confirm your improved security posture.
Oppos delivers more than just results—we provide clarity, context, and guidance. That way, you know exactly what was tested and found and how to move forward.
Get Ahead of the Next Breach—Start With a Network Pen Test
Let’s talk. Schedule a discovery call or request a sample report to see how Oppos can help protect your systems from the inside out.
Network Penetration Testing FAQs
A vulnerability assessment uses automated scanners to find known issues, while network penetration testing goes further by simulating real-world attacks. Pen testers attempt to exploit vulnerabilities to show how an attacker could gain access, steal data, or move laterally, providing deeper insight into your actual risk exposure.
Network pen tests can reveal open ports, weak authentication, misconfigured firewalls, insecure protocols, exposed IP addresses, outdated operating systems, and lateral movement paths. They also detect issues with internal segmentation, connected devices, and other systems that attackers could exploit.
Most network penetration tests take between 5 to 10 business days, depending on the size and complexity of your environment. Larger infrastructures with multiple subnets, remote users, or hybrid environments may require more time for a complete and thorough security assessment.
It depends on the testing approach. External network penetration testing simulates an outsider and requires no internal access. Internal testing, or gray box testing, may involve limited access to simulate insider threats. We’ll work with you to define the right scope and access level.
Our penetration testing process is designed to avoid disruption. We use controlled methods and schedule testing during approved windows. All simulated attacks are coordinated, logged, and carefully executed to ensure your systems stay operational throughout the assessment.
