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Vulnerability Assessment & Penetration Testing

Find the holes before an attacker does, with a report your engineers can act on.

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Vulnerability Assessment & Penetration Testing - Fastnexa service illustration

VAPT stands for vulnerability assessment and penetration testing.

It pairs automated scanning with hands-on, human-led attacks to find and prove real weaknesses across web apps, mobile apps, APIs, and networks. A scanner lists possibilities. A Fastnexa pentester chains them into an actual exploit, so you learn what a determined attacker could really do, not just what a tool flagged. Every finding comes with reproduction steps, business impact, and a concrete fix, mapped to OWASP and the requirements behind SOC 2, ISO 27001, PCI DSS, and HIPAA. You get evidence for auditors and a prioritized list for your engineers. Built for companies handling sensitive data or facing a security review that need proof of where they stand, not the false comfort of a green scan.

Founding clients10 places · until 31 December 2026

A free penetration test for our first 10 founding clients.

We would rather show our work than describe it. Our first 10 founding clients get a full vulnerability assessment and penetration test at no cost, across web applications, mobile apps and network infrastructure, with the complete findings report and a walkthrough with the engineer who ran the test.

Free for founding clients

  • Web application testing, authenticated and unauthenticated
  • Mobile application testing across iOS and Android
  • External network and infrastructure assessment
  • Manual exploitation by engineers, not scanner output
  • Full report: severity, business impact, proof of concept
  • Walkthrough call with the engineer who ran the test

Quoted separately

  • Remediation of the issues we uncover
  • Retesting once your team has shipped fixes
  • Ongoing testing tied to your release cycle

What we ask in return, stated plainly: permission to publish an anonymised case study, with nothing that could identify you. Fixing what we find is not included. If you want our engineers to do it, we quote it after you have read the report, with no obligation to accept.

Know What an Attacker Can Actually Reach

Most teams discover their exposure at the worst possible moment. A scanner report tells you a hundred things look wrong without telling you which one matters; a breach tells you far too late. VAPT closes that gap by answering a narrower and far more useful question, given what is running today, what can somebody actually get to, and what would it cost you.

Our engineers test web applications, mobile builds, APIs, and network infrastructure the way an attacker would: mapping the surface, chaining small oversights into real access, and probing the business logic that automated tooling cannot reason about. Every finding is reproduced by hand before it reaches your report, rated by genuine business impact rather than raw CVSS, and written so your developers know exactly what to change.

Our Capabilities

Web Application Penetration Testing

Mobile Application Testing for iOS & Android

Network & Infrastructure Assessment

API & Web Services Security Testing

Business Logic & Access Control Testing

OWASP Top 10 & SANS Top 25 Coverage

Cloud Configuration & Hardening Review

Prioritised Remediation Guidance & Retesting

TECHNOLOGIES

OWASP

Burp Suite

Metasploit

Kali Linux

Wireshark

Postman

Snyk

Docker

Our VAPT Process

Four phases, agreed in writing before anything is touched, from scoping through to a report your team can act on.

Scoping & Rules of Engagement

Before anything is touched, we agree in writing what is in scope, when testing happens, and where the boundaries sit.

VAPT Scoping Phase

Asset Inventory

Agree the exact domains, application builds, and IP ranges in scope.

Written Authorisation

Formal permission to test, so the engagement is lawful and documented.

Rules of Engagement

Testing windows, rate limits, excluded techniques, and a named escalation contact.

Threat Modelling

Map trust boundaries and the assets an attacker would actually want.

Discovery & Vulnerability Assessment

We map the full attack surface, then sweep it for known weaknesses and misconfigurations before any manual work begins.

Vulnerability Assessment Phase

Attack Surface Mapping

Enumerate hosts, endpoints, services, and the routes between them.

Automated Scanning

Sweep for known CVEs, weak configurations, and exposed services.

Dependency Analysis

Identify vulnerable third-party libraries and outdated components.

False Positive Triage

Every automated finding is verified by hand before it reaches your report.

Manual Penetration Testing

Our engineers attempt to exploit what the scan surfaced, plus the flaws automated tooling cannot reason about.

Penetration Testing Phase

Business Logic Testing

Abuse of workflows, pricing, and permissions that scanners never detect.

Authentication & Access Control

Session handling, privilege escalation, and broken object-level authorisation.

OWASP Top 10 Coverage

Injection, misconfiguration, and the rest of the categories that cause real breaches.

Exploit Chaining

Combine low-severity issues into the high-impact paths an attacker would take.

Reporting & Remediation Support

You receive findings ordered by real risk, written so both your board and your engineers can act on them.

VAPT Reporting Phase

Executive Summary

The risk picture in plain language, for people who do not work in security.

Technical Findings

CVSS severity, proof of concept, and step-by-step reproduction for each issue.

Prioritised Remediation

Specific guidance ordered by risk, so your team knows what to fix first.

Engineer Walkthrough

A live session with the tester to work through findings and answer questions.

What your report looks like

A manager can read the first page, and an engineer can fix from the rest. Here is the structure, and one example finding.

Inside every report

  1. 1An executive summary in plain English, for managers and auditors
  2. 2Scope, testing method and dates, agreed in writing beforehand
  3. 3Findings ordered by risk, so your team knows what to fix first
  4. 4For each finding: severity, affected asset, business impact, proof, steps to reproduce and how to fix it
  5. 5Retest results. Paid tests include one free retest within 30 days of the report

Example finding. Illustrative, not from a real engagement.

8.1HighCVSS 3.1

Any logged-in customer can read and edit other customers’ invoices

Broken access control (OWASP A01, CWE-639) · /api/invoices/{id} on app.example.com

Business impact

Changing the invoice number in a request returns another customer’s invoice, with their name, address and amounts, and lets the attacker change it. That exposes personal data and opens the door to invoice fraud.

Proof

GET /api/invoices/10482 HTTP/1.1
Host: app.example.com
Authorization: Bearer eyJ…[redacted]    # customer A

HTTP/1.1 200 OK
{"id":10482,"customer":"[redacted: customer B]","total":"4,950.00"}

Steps to reproduce

  1. Log in as customer A.
  2. Open one of your own invoices and note its ID.
  3. Change the ID to a neighbouring number.
  4. The server returns, and accepts changes to, customer B’s invoice.

How to fix it

On the server, check that the invoice belongs to the logged-in customer before returning or changing it. Do not rely on IDs being hard to guess.

Retest: fixed, and verified on retest.

Work we’ve shipped

Platforms and products our team designed and built. This is our own work, shown as it was built, with no client results claimed.

Frequently Asked Questions

Common questions about our services, processes, and technologies.

VAPT combines two things. The vulnerability assessment is broad: automated tooling sweeps your systems for known weaknesses and misconfigurations. The penetration test is deep: our engineers manually attempt to exploit what the scan found, plus the flaws scanners never catch, such as broken access control, business logic abuse, chained privilege escalation, and authentication bypass. A scan tells you a door looks unlocked. A penetration test tells you what someone can actually reach once they walk through it.

The assessment and the report. That covers web application testing, mobile application testing on iOS and Android, and external network and infrastructure testing. You receive the full findings document with severity ratings, proof of concept for each confirmed issue, reproduction steps, and remediation guidance, plus a walkthrough call with the engineer who ran the test. It is open to the first 10 companies that sign up before 31 December 2026, and there is no cost for any of it.

Two things, stated plainly. First, testing and reporting are free, fixing is not. If you want our engineers to remediate what we find, harden your configuration, or retest after your team ships patches, that is a separate paid engagement quoted once you have read the report, and you are under no obligation to take it. Second, we ask for permission to publish an anonymised case study, with nothing that could identify you.

Two honest reasons. We are a growing company, and real case studies from our first clients are what help the next company decide whether to trust us. And most organisations that have never been tested significantly underestimate their exposure. Showing you the real picture is a more convincing argument for our work than any sales conversation we could have.

Yes. Testing is delivered remotely, so location is not a constraint, and we schedule around your timezone rather than ours. The terms are identical wherever you are.

It should not, and we plan explicitly to avoid it. Before any testing begins we agree rules of engagement in writing covering scope, testing windows, rate limits, and which techniques are off the table. Intrusive checks such as denial of service are excluded by default. Where risk is unavoidable we test against staging instead, and you have a direct line to the engineer throughout so anything unexpected can be stopped immediately.

A list of the assets in scope, such as domains, application builds, or IP ranges, and written authorisation to test them. For authenticated testing we also need a set of test credentials for each user role. Most engagements are scoped in a single call and start within a few days of paperwork being signed.

For a typical single web or mobile application, expect roughly one to two weeks from kickoff to report. Larger scopes, several applications or a broad network range, take longer. We confirm the timeline during scoping rather than after, so you know what you are committing to before testing starts.

Yes, we sign an NDA before scoping and are glad to work under your paper if you prefer. Findings are encrypted at rest and in transit, shared only with the people you nominate, and any data captured during testing is destroyed once the engagement closes. We do not publish client names or use your findings as marketing material without written permission.

An executive summary written for people who do not work in security, then the technical detail: every confirmed finding with a CVSS severity rating, the business impact in plain language, proof of concept, step by step reproduction, and specific remediation guidance. Findings are ordered by risk, so your team knows what to fix first rather than facing an undifferentiated list.

VAPT continues as a standard paid service, quoted on scope, and every paid test includes one free retest within 30 days of the report. Anything scoped and agreed while a place is still open is honoured at no cost, even if the testing itself runs into January. If you are unsure whether a place is still available, ask and we will tell you straight.

At minimum annually, and after any significant change: a major release, a new integration, an infrastructure migration, or a shift in your compliance obligations. Organisations shipping continuously are better served by testing tied to their release cycle rather than the calendar. Many compliance regimes, including PCI DSS, SOC 2, and ISO 27001, set their own minimum frequency, and we can align to whichever applies to you.

Guides on VAPT & Penetration Testing

Written by the engineers who do the work, and honest about the limits.

The team's certifications

Held by the engineers who would run your engagement, not by the company in the abstract. Every one is verifiable with the body that issued it.

  • OSCP

    Offensive Security Certified Professional · Offensive Security

    A 24-hour practical exam requiring live exploitation of unfamiliar machines. Widely treated as the baseline for hands-on penetration testers.

  • eWPTX

    Advanced Web Application Penetration Tester · INE Security

    Advanced web exploitation, covering the chained and logic-level flaws that automated scanners do not find.

  • CWES

    Certified Web Exploitation Expert · Hack The Box

    Practical web exploitation assessed by compromising live targets rather than by multiple choice.

  • CEH

    Certified Ethical Hacker · EC-Council

    Broad offensive security methodology. Frequently named directly in enterprise and public-sector procurement requirements.

  • CDSA

    Certified Defensive Security Analyst · Hack The Box

    The defensive counterpart: detection engineering, log analysis and incident response, assessed hands-on.

  • CySA+

    Cybersecurity Analyst · CompTIA

    Threat detection and behavioural analytics. Approved under the US DoD 8140 framework, which some contracts require.

  • SC-200

    Security Operations Analyst Associate · Microsoft

    Operating Microsoft Sentinel and Defender, which is what matters if your estate is already on Microsoft 365 or Azure.

  • HCIA-Security

    Huawei Certified ICT Associate, Security · Huawei

    Network security on Huawei infrastructure, common in telco and enterprise networks outside North America.

  • ISO/IEC 27001:2022 Lead Auditor

    PECB

    Qualified to run a full external audit against the current 27001 revision, not merely to advise on it.

  • NIST CSF Lead Auditor

    NIST Cybersecurity Framework Lead Auditor · PECB

    Auditing against the updated NIST Cybersecurity Framework, which US federal supply chains increasingly ask for.

Certificate numbers are personal to the holder, so we do not publish them. We will evidence any of these directly on a call.

Our security partners

See all our partners →

Related reading

Arguments from our cybersecurity practice.

All articles

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Adversary simulation and offensive security.

Threat Detection & Response

Monitoring, detection, and incident response.

Cloud Security

Securing AWS, Azure, and GCP environments.

Application Security

SAST/DAST and secure development.

Data Privacy & Compliance

GDPR, HIPAA, SOC 2, ISO 27001.

DevSecOps Implementation

Security built into CI/CD pipelines.

Related reading:Fastnexa Blog

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Founding clients

Claim a free security assessment

For our first 10 founding clients, until 31 December, we're covering the cost of a full vulnerability assessment and penetration test. Tick the claim box and we'll scope it with you.

  • Web application testing, authenticated and unauthenticated
  • Mobile application testing across iOS and Android
  • External network and infrastructure assessment
  • Manual exploitation by engineers, not scanner output

Testing and the report are free. Fixing what we find is quoted separately, with no obligation to accept. In return we ask for permission to publish an anonymised case study.

Read the full offer

Tell us what you are trying to build and we will tell you plainly whether we are the right people for it. Book a call with an expert to work through the detail, or ask for a fixed quote if the scope is already clear. No obligation either way.

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