Penetration Testing Services
A penetration test shows how far a real attacker could get into your network and applications, and what they could reach once inside. Defensible's testers combine reconnaissance with manual exploitation, then hand you a prioritized report your team can act on.
We test external perimeters, internal networks, and web and mobile applications, tailored to your environment and to what your customers, auditors and insurers need to see.
Request a Pen Test QuoteExternal Penetration Tests
External penetration tests support the management of your internet-facing attack surface through controlled, targeted attacks on your network's perimeter. Understanding the vulnerabilities that exist outside of your internal programs lets you identify the most pressing risk and effectively utilize your security resources.
Internal Penetration Tests
Get ahead of insider threats and uncover vulnerabilities in your network with internal penetration testing. These penetration tests can also provide insights into unseen risks that may be present in your internal controls and user access protocols.
Web & Mobile Application Penetration Tests
Cyber attackers are targeting web and mobile apps with much greater frequency. Performing regular penetration tests not only improves the overall security of your APIs, web apps, and software, but also improves user experience and trust, knowing that their data is protected.
How Our Penetration Tests Work
- STEP 1
Scoping call
We agree what's in scope (IP ranges, applications, APIs, cloud accounts, user roles) and what you need the results for: a customer, an auditor, an insurer or your own roadmap.
- STEP 2
Rules of engagement
Testing windows, contacts, out-of-bounds systems and emergency stop procedures are written down and signed before any testing starts.
- STEP 3
Reconnaissance
Testers map the attack surface the way an attacker would: exposed services, technologies in use, credentials in public breaches and application entry points.
- STEP 4
Manual exploitation
Experienced testers go beyond scanner output, confirming which weaknesses are exploitable and chaining findings to show real business impact.
- STEP 5
Report and executive readout
You get a prioritized report and a walkthrough call for leadership and the technical team, with clear next steps.
- STEP 6
Retest
Once fixes are in, we can retest critical and high findings to confirm they're closed.
What You Receive
- Executive summary written for leadership and the board
- Technical findings with CVSS and business-risk ratings
- Step-by-step reproduction details for each finding
- Remediation guidance your team can act on
- Attestation letter for customers and auditors
Standards We Test Against
- OWASP Top 10 and OWASP ASVS: for web applications and APIs
- PTES: the Penetration Testing Execution Standard, for overall methodology
- NIST SP 800-115: technical guide to information security testing and assessment
- MITRE ATT&CK: mapping of techniques so findings line up with detection engineering
Penetration Testing FAQs
How long does a penetration test take?+
Most external or single-application tests take one to two weeks of testing, plus reporting. Larger internal networks or multiple applications take longer. We confirm the timeline during scoping, before any work starts.
What does a penetration test cost?+
Cost depends on scope (IPs, applications, API routes, user roles), test type, depth of manual testing and the reporting you need. We provide a fixed quote after a scoping call. Our guide to penetration testing cost explains what drives the price.
How often should we test?+
At least annually, and after significant changes such as a new application release, a cloud migration or an acquisition. Many SOC 2, PCI DSS and customer contracts also require an annual test.
Will testing disrupt production?+
Testing is planned to avoid disruption. Rules of engagement set testing windows, exclude fragile systems and define emergency contacts, and testers avoid destructive techniques unless you explicitly approve them.
Do you test cloud environments like AWS, Azure and Microsoft 365?+
Yes. We test cloud-hosted applications and infrastructure, and review identity and configuration weaknesses in AWS, Azure and Microsoft 365, within the testing rules each provider publishes.
What's the difference between a penetration test and a vulnerability scan?+
A vulnerability scan is automated and lists potential weaknesses. A penetration test uses experienced testers to confirm which weaknesses are actually exploitable, chain them together and show the business impact. Scans are a useful baseline; a pen test shows what an attacker could really do.
Related reading: Penetration testing cost · Red team vs pen test · Should you change vendors every year?
Other Assessment Services
Additional managed cybersecurity services designed to strengthen resilience and reduce operational risk.
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Learn MoreCyber Due Diligence for M&A
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Learn MoreFind Out What an Attacker Would Find First
Tell us what's in scope and what the results are for. We'll come back with a fixed quote.