Penetration Testing
Penetration testing (pentest) is an authorized, simulated cyber attack on an IT system to find security gaps before real attackers can exploit them.
Penetration testing is one of the most effective ways to test the security of IT systems. Specialized security experts – ethical hackers – simulate targeted attacks on networks, web applications or infrastructure to uncover vulnerabilities. Unlike automated vulnerability scans, pentesters work creatively and combine techniques as real attackers would. The result is a detailed report with concrete remediation steps.
What is Penetration Testing?
Penetration testing is a systematic, authorized security test in which experienced experts try to break into an IT system. Unlike vulnerability scans that automatically check for known issues, pentesters use manual techniques, social engineering and creative attack scenarios. Types include black-box (no prior knowledge of the target), white-box (full access to source and docs) and grey-box (partial knowledge, e.g. user credentials). Scope can be web application, network, physical or social engineering. Standards like the OWASP Testing Guide and PTES structure the process.
How does Penetration Testing work?
A pentest follows a structured process. Reconnaissance: gather public information (domains, IPs, technologies). Scanning: identify open ports, services and potential vulnerabilities. Exploitation: try to exploit findings to gain access. Post-exploitation: assess how far an attacker could go (lateral movement, privilege escalation). Finally a detailed report documents all findings, risk ratings and concrete remediation. Phases are agreed in advance (scope, rules of engagement).
Practical Examples
Web application pentest: Check an online shop for SQL injection, XSS, weak authentication and insecure API endpoints per OWASP Top 10.
Network pentest: Simulate attack on corporate infrastructure: firewall bypass, lateral movement and privilege escalation to domain admin.
Mobile app pentest: Analyse a banking app for insecure storage, missing certificate pinning and API vulnerabilities.
Social engineering test: Simulated phishing campaign to test staff susceptibility and identify awareness needs.
Cloud pentest: Review AWS/Azure config for exposed S3 buckets, overly broad IAM and unencrypted databases.
Typical Use Cases
Compliance: PCI-DSS, ISO 27001 and many standards require regular penetration tests
Before go-live: New applications and infrastructure changes are tested for vulnerabilities before production
After incidents: Pentests help identify and close remaining gaps after a breach
M&A due diligence: Assess target company’s IT security before acquisition
Ongoing security: Annual or semi-annual pentests as part of continuous security strategy
Advantages and Disadvantages
Advantages
- Realistic risk view: Pentests show which vulnerabilities are actually exploitable, not just theoretical
- Proactive security: Gaps are found and closed before real attackers find them
- Compliance proof: Pentest reports serve as evidence for auditors and regulators
- Awareness: Results sensitize management and development to security
- Prioritization: The report helps focus resources on the most critical issues
Disadvantages
- Snapshot: A pentest reflects the state at test time – new issues can appear anytime
- Cost: Professional pentests by experienced specialists are a significant investment
- Operational risk: Improper execution can impact systems or data
- Scope limits: Only the defined scope is tested – other areas remain blind spots
Frequently Asked Questions about Penetration Testing
How often should penetration testing be done?
What is the difference between a pentest and a vulnerability scan?
Is a pentest dangerous for production systems?
Related Terms
Want to use Penetration Testing in your project?
We are happy to advise you on Penetration Testing and find the optimal solution for your requirements. Benefit from our experience across over 200 projects.