Penetration testing exposes security vulnerabilities, design weaknesses, and operational risks, allowing your organisation to safeguard all information assets and remain resilient against attacks that could disrupt business continuity.
Penetration Testing Service | TSE Class A & CREST Certified
Under the Cybersecurity Law, we plan and deliver penetration testing programmes that protect organisations — especially critical infrastructure operators — and prevent cyberattacks. Contact us for sector-specific information systems penetration testing.
Penetration Testing Service
- External Testing (External Network)
- Internal Testing (Internal Network)
- Black Box Testing
- White Box Testing
- Gray Box Testing
Scoping Form
What Are the Pentest Standards?
Every penetration testing firm develops its own methodologies and vulnerability databases over years of experience. You can find summary presentations of Nesil’s penetration testing methodologies in the video recordings above. Alongside these, we apply widely accepted penetration testing methodologies, vulnerability databases, severity rating guides, and best practices, including the following:
- TSE TS 13638/T2 Certified Penetration Testing Firm (Certificate No: TSE-STF-065)
- Republic of Türkiye Ministry of Industry & Technology — Penetration Testing Authorisation Certificate (STB03-250)
- Republic of Türkiye Ministry of Industry & Technology — Public Sector IT Authorisation Certificate (STB01-3242)
- TS 13638 (Information Technology)
- CREST Penetration Testing Guide
- NIST Cybersecurity Framework and NIST SP 800-115 — Technical Guide to Information Security Testing and Assessment
- PTES (Penetration Testing Execution Standard)
- OWASP Top 10:2021 and OWASP Web Security Testing Guide (WSTG) v4.2
Our Team Is Ready for Regulatory Compliance
In Türkiye, several statutory regulations make penetration testing mandatory. These rules primarily target organisations operating in data protection and cybersecurity-sensitive sectors. Key regulations applicable to penetration testing in Türkiye include:
- Information and Communication Technologies Authority (BTK) — SOME and ISO 27001 requirements
- PCI DSS v4.0.1 Requirement 11.4 — semi-annual penetration testing and post-change testing in cardholder data environments → Regulatory-Compliant Penetration Testing
- Communiqué on the Trust Seal in Electronic Commerce
- BRSA (Banking Regulation and Supervision Agency) — Annual penetration testing requirement under the Information Systems Management Communiqué → BRSA Penetration Testing Details
- CMB (Capital Markets Board of Türkiye) Regulations → CMB Penetration Testing Details
- Türkiye Data Protection Law (KVKK) — Data Security Obligations
- Cybersecurity Law No. 7545
What Do You Gain From a Penetration Test?
Use penetration testing reports to demonstrate the resilience of your application security to your clients. These reports identify potential weaknesses in your systems and provide evidence that vulnerabilities have been remediated, allowing you to substantiate the reliability of the services you offer with concrete data.
Client References
Our clients consistently highlight our high level of professionalism, technical expertise, and solution-oriented approach in penetration testing engagements. They express satisfaction with the clear identification of vulnerabilities and the actionable remediation guidance provided. In particular, they recommend us as a reliable and outcome-driven business partner.
Gökhan Yağmur – IT Lead, Türkiye Petrolleri
We are highly satisfied with the penetration testing service we conducted with Nesil. Throughout the engagement, the team built confidence with both their technical expertise and their solution-oriented approach. They identified our security vulnerabilities quickly and clearly, and with their recommendations helped us further strengthen our systems. Gökhan Yağmur IT Lead Türkiye Petrolleri
Tanju Demir – IT Manager, Honda Terakki
Our company, Honda Terakki, partnered with Nesil to strengthen its cybersecurity strategy through penetration testing services. Throughout the engagement, NESİL met our expectations and delivered a top-tier service with its professional competence, technical expertise, and disciplined working approach. As part of the penetration testing activities, potential security vulnerabilities in our information systems were successfully identified,…
Sedat Can – IT Team, Cengiz Holding Eti Bakır
Cengiz Holding Eti Bakır facility ran a penetration testing project with Nesil in line with our security needs. The engagement was professional and meticulous from start to finish. The team met our expectations both in terms of technical depth and on-time delivery. Throughout the penetration test, Nesil reported our existing security vulnerabilities in detail and…
Ali Rıza Çanakçı – İşmer (İş Bankası Subsidiary)
As İşmer, a subsidiary of İşbank, we engaged Nesil Teknoloji for penetration testing in order to strengthen our security infrastructure and adopt a proactive approach against emerging threats. Throughout the engagement, Nesil Teknoloji’s professional approach, detailed analyses, and deep technical expertise exceeded our expectations. They thoroughly evaluated our security gaps and provided solution-oriented recommendations that…
Our Certification Credentials
With an expert team certified in CEH, OSCP, CompTIA Security+, CISSP, CISA, GPEN, LPT, and TSE Senior/Certified/Registered Penetration Tester credentials, we deliver penetration testing and cybersecurity services to more than 1,500 enterprise clients in line with national and international standards.
View Certifications
Cybersecurity Team — Uygar Aydın — Online Meeting
Information Systems Penetration Testing scope together. In a 30-minute online meeting,
we will set the regulation-compliant scope, testing timeline, and delivery process, and share our proposal.
- Pre-engagement reconnaissance & scope validation (tailored to your organisation)
- Regulation-compliant notification and reporting plan
- Fast quotation and engagement start date
Fill in the form and send it to [email protected] .
Penetration Testing and Penetration Test Service
A penetration test, also known as pen test or pentest, is a controlled security test conducted to identify security vulnerabilities in organisations' systems, networks, web applications, mobile applications, and cloud infrastructures before malicious actors can find them. The penetration testing service is a professional security assessment process that validates these vulnerabilities, determines risk levels, reports findings, and delivers remediation recommendations. As of May 2026, the relevant regulations are aligned with the TSE TS 13638/T2 methodology and OWASP Top 10:2021 standards.
The penetration testing and pen test service we provide at Nesil Teknoloji focuses on making security levels visible across web applications, mobile applications, API services, internal networks, external networks, and cloud systems. The service is designed not only for technical vulnerability detection but also for risk prioritisation, reporting, and producing actionable security outcomes.
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Summary
This page is designed to address both informational queries such as penetration testing and pen test, as well as transactional queries such as penetration testing service, penetration testing firm, pentest service, penetration testing prices, and pentest report.
What Is a Penetration Test?
A penetration test is a security assessment performed to validate the security controls of an information system, application, or network through controlled attack scenarios. In English usage, this service is most commonly referred to as a penetration test or pentest.
A penetration test is not the same thing as a vulnerability scan. A vulnerability scan often lists potential weaknesses. A penetration test, on the other hand, verifies whether these weaknesses are actually exploitable, evaluates business impact, and surfaces priority risks.
What does a penetration test do?
- Makes critical security vulnerabilities visible
- Demonstrates whether vulnerabilities are truly exploitable
- Prioritises risks with high business impact
- Builds an action plan for technical teams
- Produces decision-support outputs for management
- Measures the effectiveness of security investments
What does penetration testing mean?
Put simply, a penetration test means seeing how an attacker could approach your systems in advance, in a controlled and authorised manner — before the organisation does. The aim is not to cause harm but to measure security posture, identify weak points, and prioritise remediation.
What Is a Pen Test?
Pen test is the more technical and corporate term for a penetration test. In Türkiye some users say "penetration testing", some say "penetration testing", and more technical teams use "pentest". In practice, these terms generally refer to the same service.
What is pentest?
Pentest is the shortened form of penetration test. It is widely used by technical teams, software firms, and security professionals.
Are a pen test and a penetration test the same?
In most usage, yes. However, "pen test" tends to be more technical, while "penetration test" is the broader term. From an SEO perspective, it is important that both keywords appear in balanced and natural form on the same page.
What Does a Penetration Testing Service Cover?
The same scope does not apply to every organisation. A correct penetration testing service is shaped by the organisation's technology architecture, external attack surface, data intensity, user structure, and risk profile.
In general, a penetration testing service may cover the following areas:
- Web application penetration testing
- Mobile application penetration testing
- Internal network penetration testing
- External network penetration testing
- API penetration testing
- Cloud penetration testing
- Wireless network security tests
- Social engineering scenarios
What outputs are delivered in an enterprise penetration testing service?
- Scope summary
- Methodology summary
- Validated findings list
- Risk levels
- Business impact assessment
- Technical explanations
- Remediation recommendations
- Re-test results, where applicable
What Are the Types of Penetration Testing?
Penetration testing types vary based on the level of information given to the test team and the scenario being targeted.
Black Box Penetration Test
The test team is given minimum information about the target. The goal is to simulate external attacker behaviour as realistically as possible.
Gray Box Penetration Test
The test team is provided with limited user or architectural information. In most enterprise projects, this is the preferred model in terms of scope and efficiency balance.
White Box Penetration Test
The test team is given more technical information, architectural detail, or user access. It is preferred for scenarios requiring deeper analysis.
What are the penetration testing levels?
What users search for as "penetration testing levels" usually corresponds to these three test models. In some projects, additional classifications based on application level, network level, or scope depth may also be made.
Systems Tested with Our Pentest Service
Web Application Penetration Testing
Corporate websites, customer portals, admin panels, e-commerce platforms, and custom software interfaces are tested within this scope. In particular, authentication, authorisation, session management, data exposure, input validation, and business logic flaws are at the centre of these tests.
Mobile Application Penetration Testing
iOS and Android applications are evaluated for on-device data storage structure, token management, API communication, certificate validation, and application logic.
Internal Network Penetration Testing
Internal network penetration testing measures how far an attacker who has gained a certain level of access inside the organisation can advance. Privilege escalation, identity management, and segmentation gaps are critical components of this area.
External Network Penetration Testing
External network penetration testing is the evaluation of internet-facing systems from an attacker's perspective. Open services, misconfigurations, information leakage, and the invisible attack surface are important parts of this test.
API and Microservice Penetration Testing
In REST and GraphQL services, authorisation, object access, data exposure, business logic vulnerabilities, and rate-limiting gaps are assessed.
Cloud Penetration Testing
In cloud environments, access permissions, misconfigurations, open storage areas, service connections, and identity management are reviewed.
TSE-Certified Penetration Testing Methodology and Enterprise Testing Approach
For a corporate penetration testing engagement to produce value, the methodology must be clear. Tests that proceed randomly or rely solely on tool output do not provide sufficient decision support for the organisation.
A sound penetration testing methodology generally consists of the following steps:
- Scoping: The systems, areas, user levels, and boundaries to be tested are clarified.
- Information Gathering: Passive and active data about the target systems is collected.
- Vulnerability Analysis: Potential weaknesses are analysed and false positives are filtered out.
- Controlled Validation: Whether vulnerabilities are actually exploitable is tested.
- Impact Assessment: The business impact of technical findings is determined.
- Reporting: Technical and management reports are prepared.
- Re-testing: Where required, it is re-verified whether vulnerabilities have been closed.
The Difference Between Vulnerability Scanning and Penetration Testing
These two concepts are very often confused. However, a penetration test and a vulnerability scan are not the same.
| Criterion | Vulnerability Scan | Penetration Test |
|---|---|---|
| Method | Mostly automated | Expert-led and controlled |
| Output | List of potential weaknesses | Validated findings |
| Depth | Medium | High |
| Business Impact | Limited | Strong |
| Reporting | Technical output | Technical + management output |
The ideal approach is to use vulnerability scanning and penetration testing as two methods that complement each other.
Pentest Report and Penetration Test Report
One of the most critical outputs of a penetration testing service is the report. The value to the organisation is created not only by finding the vulnerability but also by understanding its impact, its priority, and how it can be remediated.
What is a pentest report?
A pentest report is the technical security deliverable that contains the systems tested, the approach used, the validated findings, the risk levels, and the remediation recommendations.
What is included in a penetration test report?
- Executive summary
- Scope information
- Test approach
- Findings list
- Risk rating
- Technical explanations
- Remediation recommendations
- Re-validation information
Why is a sample penetration test report important?
Organisations often want more than just the service; they also want to see the quality of the report. For this reason, the query "sample penetration test report" is a behaviour closely tied to purchasing intent.
Penetration Testing Prices and the Pentest Proposal Process
Penetration testing prices cannot be tied to a fixed label. This is because what determines the price is not only the name of the test, but the scope.
How are penetration testing prices determined?
- Number of systems to be tested
- Web, mobile, network, API, or cloud distinction
- Test depth
- User or privilege level
- Reporting scope
- Need for re-testing
- Project duration
Why does the penetration test price vary?
Testing a single web application is not the same scope as testing a multi-layered web + mobile + API + network setup. For this reason, penetration test prices vary on a per-project basis.
How does the pentest proposal process work?
- An initial scoping discussion is held
- The areas to be tested are clarified
- Technical needs and priorities are determined
- Choosing the Right Penetration Testing Firm
Users searching with queries such as "penetration testing firms", "penetration test providers", "penetration testing firm", and "pentest firms" usually have direct purchasing intent. At this stage, firm selection should be evaluated not only on price but also on quality and methodology.
What to look for when selecting a penetration testing firm?
Scoping approach
- Clarity of the test methodology
- Reporting quality
- Technical team experience
- Communication and project management discipline
- Re-validation approach
- How are penetration testing firms evaluated?
A firm should be evaluated not only on whether it performs tests, but also on whether it produces meaningful reports, technical action, and output appropriate to the organisation.
For Which Organisations Is Penetration Testing Required?
For Which Organisations Is Penetration Testing Required?
Penetration testing is beneficial for many organisations, but it becomes far more critical for certain types of structures:
- E-commerce companies
- Software and SaaS firms
- Data-intensive organisations
- Companies processing financial transactions
- Organisations operating customer portals or admin panels
- Teams developing web, mobile, or API-based products
Frequently Asked Questions
What is a penetration test?
A penetration test is a controlled security test conducted to detect security vulnerabilities in systems before malicious actors do.
What is a pen test?
A pen test is the more technical name for a penetration test. In most cases, it refers to the same service.
What is pentest?
Pentest is the short form of "penetration test".
What does penetration testing mean?
A penetration test means seeing in advance, in a controlled way, how an attacker could approach the systems.
What does a penetration testing service cover?
It may cover the testing of security controls across web, mobile, network, API, cloud, and access structures.
How much do penetration testing prices cost?
Pricing varies according to the number of systems, scope, reporting depth, and re-testing needs.
What is a pentest report?
A pentest report is a security report containing the validated findings, risk levels, and remediation recommendations.
On which systems is penetration testing applied?
It can be applied on web applications, mobile applications, network systems, API services, cloud environments, and certain wireless network structures.
How often should penetration testing be performed?
It is generally recommended at least once a year and again after major system changes.
Conclusion
Penetration testing and pen testing are professional security services used to realistically assess the security posture of organisations' digital infrastructures. A penetration testing service that is conducted with the correct scope, that has a strong methodology, clear reporting, and the capacity to produce action, strengthens the organisation's technical and management-level security visibility.
If the goal is to bring both users searching for broad information and organisations directly looking for a service together on the same page, this structure provides the right foundation. To gain visibility in queries such as penetration testing, penetration test, penetration testing service, penetration testing firm, pentest firms, penetration testing prices, and pentest report, content, scope, and service approach must be considered together.