Your organization has decided to get a penetration test. Maybe your cyber insurance requires it. Maybe a client asked about your security posture. Maybe you just want to know where your vulnerabilities are before an attacker finds them. Whatever the reason, understanding the process helps you get the most value from the engagement.
What a Penetration Test Actually Is
A penetration test is a controlled, authorized attempt to exploit vulnerabilities in your systems, networks, or applications. Unlike a vulnerability scan — which is automated and identifies known weaknesses — a penetration test involves a skilled tester attempting to chain vulnerabilities together and demonstrate real-world impact.
The goal isn't to "hack" your company. The goal is to identify exploitable security weaknesses and demonstrate the business risk they represent, so you can fix them before an actual attacker takes advantage.
Types of Penetration Tests
External Network Penetration Test
Tests your internet-facing systems — websites, email servers, VPN gateways, cloud services — from the perspective of an outside attacker. This is the most common starting point.
Internal Network Penetration Test
Tests what an attacker could do after gaining initial access to your internal network. This simulates a compromised employee workstation, a malicious insider, or an attacker who has bypassed your perimeter.
Web Application Penetration Test
Focused testing of a specific web application for vulnerabilities like SQL injection, cross-site scripting, authentication bypasses, and business logic flaws.
Social Engineering Assessment
Tests the human element through phishing campaigns, phone-based pretexting, or physical security testing. Often combined with other test types.
The Process
1. Scoping and Rules of Engagement
Before testing begins, you'll define:
- What systems are in scope
- What testing methods are authorized
- Testing windows (business hours, after hours, weekends)
- Emergency contacts in case something goes wrong
- Any systems or techniques that are explicitly off-limits
This is documented in a formal rules of engagement (ROE) or statement of work.
2. Reconnaissance
The tester gathers information about your organization — publicly available data, DNS records, exposed services, technology stack, employee information. This mirrors what a real attacker would do before launching an attack.
3. Vulnerability Identification
Using a combination of automated scanning and manual analysis, the tester identifies potential vulnerabilities across in-scope systems.
4. Exploitation
This is where penetration testing diverges from vulnerability scanning. The tester attempts to exploit identified vulnerabilities to demonstrate actual impact — accessing sensitive data, moving laterally through the network, escalating privileges, or achieving other defined objectives.
5. Post-Exploitation and Documentation
If exploitation is successful, the tester documents exactly what was accessed, how, and what the business impact could be. This includes evidence like screenshots, data samples (handled securely), and attack path diagrams.
6. Reporting
You'll receive a detailed report that includes:
- An executive summary written for non-technical stakeholders
- Detailed technical findings with evidence
- Risk ratings for each finding
- Specific remediation recommendations
- An overall assessment of your security posture
7. Debrief
A good penetration testing firm will walk you through the findings, answer questions, and help you prioritize remediation. This debrief is where much of the value is delivered.
How to Prepare
To get the most value from your penetration test:
- Define your goals — Are you checking a compliance box, or do you want a thorough assessment of risk?
- Provide accurate scope information — IP ranges, URLs, network diagrams, and technology details help the tester focus on what matters.
- Inform key stakeholders — Your IT team and managed service provider should know testing is happening.
- Don't "clean up" first — The test should evaluate your actual security posture, not a temporarily hardened version.
- Plan for remediation — Budget time and resources to fix what the test finds. A report that sits on a shelf provides no value.
Red Flags in Penetration Testing Providers
Not all penetration tests are created equal. Watch out for:
- Automated-only testing marketed as penetration testing (that's a vulnerability scan)
- No scoping conversation before providing a quote
- No rules of engagement or statement of work
- Reports that are just scanner output without manual analysis or business context
- No debrief or remediation guidance included
- Pricing that seems too low — quality manual testing requires skilled professionals and adequate time
After the Test
The penetration test report is a starting point, not an endpoint. After receiving results:
- Review findings with your team and the testing firm
- Prioritize remediation based on risk rating and exploitability
- Fix critical and high findings within 30 days
- Address medium findings within 90 days
- Retest critical findings after remediation to verify they're resolved
- Schedule your next test — annual testing is standard; quarterly for high-risk environments
A penetration test gives you a snapshot of your security at a specific point in time. Regular testing, combined with ongoing monitoring and vulnerability management, builds a continuous understanding of your risk posture.