External Network Penetration Testing Services

An External Network Penetration Test is a security assessment of systems exposed to the public internet. Its goal is to find vulnerabilities, misconfigurations, exposed services, weak authentication, and attack paths that could let an outside attacker in.

A vulnerability scan just finds possible issues, but a penetration test goes further to see if those weaknesses can actually be used by attackers. This matters because not every vulnerability is equally risky. Some are hard to exploit, while others give attackers an easy way in.

External penetration testing is about checking real-world risks, not just making a list of technical issues.

Businesses often spend a lot on firewalls, endpoint protection, intrusion detection, cloud security, and training. These are important, but attackers only need to find one weakness to start an attack.

As environments change, internet-facing assets can get overlooked. New cloud resources, remote access tools, app updates, and vendor connections all add up. Over time, these changes can create security gaps that internal teams might miss.

External penetration testing helps companies find these gaps before cybercriminals do. It also gives leaders a clear view of the risks associated with public systems and shows if current security controls are working effectively.

• Black Box Penetration Test: Simulates an attack by an uninformed outsider, providing a realistic assessment of your network defenses.
• Gray Box Penetration Test: This test combines partial knowledge of your network with efficient security assessments, balancing the benefits of black-and-white box testing.
• White Box Penetration Test: This test involves complete knowledge of your network to identify deep-rooted vulnerabilities and assess internal security controls.
• Authenticated Penetration Test: Uses valid user credentials to assess security from the perspective of an active user, identifying vulnerabilities from malicious insiders or attackers with stolen credentials.
• Red Team Penetration Test: Simulates an attack by an outsider, providing a comprehensive evaluation of your security defenses and incident response capabilities

The scope of an external network penetration test typically includes any system that is accessible from the public internet. This may include firewalls, VPN gateways, remote access platforms, cloud-hosted infrastructure, public IP addresses, externally accessible applications, email security systems, DNS services, and internet-facing servers.

Modern environments often extend beyond traditional network infrastructure. Cloud services, SaaS platforms, APIs, remote workforce technologies, and third-party integrations frequently become part of the external attack surface. A comprehensive assessment evaluates how these systems interact and whether they create opportunities for attackers to gain access.

The goal is not just to test each asset, but to see how an attacker could move through your environment if they find a weakness.

We start each engagement by finding which systems are exposed to the internet and learning about your organization’s goals, security concerns, and compliance needs.

Our consultants look for publicly accessible systems and gather information that attackers might use. Next, we check exposed services, authentication, remote access, network devices, cloud resources, and other infrastructure for vulnerabilities and weaknesses.

When it makes sense, we safely exploit found vulnerabilities to assess whether unauthorized access is possible and to understand the business impact. All testing follows clear rules to keep operational risk low.

After the assessment, clients get a detailed report with executive summaries, technical findings, risk ratings, attack scenarios, recommendations, and clear next steps.

Our Testing Methodology

1. Preparation and Planning: We begin by understanding the scope of your external network and clearly defining the scope of the test.
2. Vulnerability Assessment: We use automated tools and manual techniques to identify vulnerabilities such as open ports, misconfigurations, and outdated software.
3. Exploitation: We attempt to exploit identified vulnerabilities to understand their impact and potential risks, demonstrating the real-world implications of security weaknesses.
4. Reporting and Recommendations: Comprehensive reports are written detailing the vulnerabilities, their potential impact, and how to fix them.

External penetration tests often uncover issues that routine vulnerability scanning may miss. Common findings include exposed administrative interfaces, weak authentication controls, outdated software, insecure VPN configurations, misconfigured cloud resources, insufficient network segmentation, exposed development systems, and internet-facing services that should not be publicly accessible.

We also frequently identify vulnerabilities associated with identity management systems, remote workforce technologies, cloud platforms, and third-party integrations. While many of these weaknesses are not intentionally introduced, they can create significant opportunities for attackers if left unaddressed.

An external penetration test helps businesses clearly identify their most significant security weaknesses, validate the effectiveness of their internet security controls, and understand the real-world risks posed by actual attack paths. This clarity enables organizations to prioritize their remediation based on which issues are most likely to be exploited.

External penetration testing results give organizations direct insight into how attackers could view and target their environment. By turning technical details into clear business risks, testing guides, board reporting, risk assessments, and cybersecurity planning to support effective, informed decisions.

Most importantly, external penetration testing enables businesses to proactively find security weaknesses, reduce risk, and enhance overall protection before attackers can exploit vulnerabilities.

At Tanner Security, we are the IT security consultants who stand at the forefront of protecting your future. Trusted by Fortune 500 companies, dynamic SaaS enterprises, and cherished family-run businesses, we work to earn your trust. With decades of expertise, new technology, and innovative strategies, we help companies improve their security programs and protect their digital infrastructure.

We guide businesses through cybersecurity regulations, offering tailored solutions that meet their specific needs and industry standards. Our innovation and expertise are perfect to be your strategic partner, delivering top-notch solutions to complex issues.

Proper cybersecurity is essential for business success. Our mission is to improve your IT security systems, helping you grow confidently with secure and protected systems.

Why Tanner Security

At Tanner Security, we understand the importance of strong IT security and compliance. Our IT security team offers custom solutions for your challenges and regulatory needs. We can help you protect sensitive data, meet industry standards, and strengthen your IT systems against cyber threats. Contact us today to improve your security and support your business growth.

One of the most common questions businesses ask is whether they need an external network penetration test or a vulnerability assessment. While both services evaluate the security of your internet-facing systems, they serve different purposes and provide different levels of insight. Understanding the difference can help your company select the right assessment based on its security goals, compliance requirements, and overall risk profile.

A vulnerability assessment is designed to identify known security weaknesses across your external network. Automated tools scan internet-facing systems, such as firewalls, VPNs, web servers, and remote access services, looking for missing patches, insecure configurations, outdated software, weak encryption, and other common vulnerabilities. The result is a comprehensive inventory of potential security issues that should be reviewed and remediated. Vulnerability assessments provide excellent visibility into your security posture and are an important part of any ongoing cybersecurity program.

An external network penetration test goes further. Rather than simply identifying potential vulnerabilities, experienced penetration testers attempt to exploit them using the same techniques real-world attackers use. The goal is to determine whether a weakness can actually be used to gain unauthorized access, escalate privileges, bypass security and IT controls, or compromise sensitive systems. This approach provides a much clearer understanding of your company’s actual exposure and the business impact of successful attacks.

For example, a vulnerability assessment may identify that an internet-facing server is running outdated software with a known vulnerability. A penetration test determines whether that vulnerability can actually be exploited, what level of access could be obtained, whether additional systems could be compromised, and how far an attacker could move through your environment after gaining initial access.

Both services provide value, but they answer different business questions. A vulnerability assessment asks, “What weaknesses exist?” An external penetration test answers the question, “Which of those weaknesses could actually be exploited to compromise our business?”

Many companies perform regular vulnerability assessments throughout the year to continuously identify newly discovered vulnerabilities while scheduling external network penetration tests annually, after significant infrastructure changes, or to satisfy compliance requirements such as PCI DSS, SOC 2, ISO 27001, CMMC, and other cybersecurity frameworks. Together, these services provide a more complete understanding of your external security posture and help prioritize remediation efforts based on actual business risk rather than simply the number of vulnerabilities identified.

If your objective is to understand your true exposure to external cyber threats, validate your existing security controls, and identify the vulnerabilities that pose the greatest risk to your business, an external network penetration test provides the deeper level of analysis that automated vulnerability scanning alone cannot deliver.