CREST CERTIFIED · IASME CYBER ESSENTIALS BODY
CREST-Certified Penetration Testing Built for UK Businesses That Demand More
Web, mobile, infrastructure, cloud, and red team, delivered by UK and international pentesters with live findings, free retests, and 24-hour startup. Accepted for FCA, PCI DSS, ISO 27001, SOC 2, and Cyber Essentials Plus audits.
CREST
Approved Penetration Testing Provider
IASME
Cyber Essentials Certification Body
24h
From Signed Scope to Active Testing
100%
UK & International Pentesters, Matched to Your Needs
OUR SERVICES
Full-Spectrum Offensive Security Testing
Every test type UK businesses commission, under one CREST-approved roof. From web app pentests to multi-week red team simulations.
Application Security
Web Application Penetration Testing
Manual exploitation of OWASP Top 10 vulnerabilities, business logic flaws, broken authentication, IDOR, SSRF, and multi-tenant security boundaries. Authenticated and unauthenticated testing across every user role. Findings mapped to CVSS 3.1 with reproduction steps and code-level remediation guidance.
Mobile Security
Mobile Application Penetration Testing
iOS and Android testing aligned to OWASP Mobile Top 10. Static and dynamic analysis covering traffic interception, certificate pinning bypass, insecure local storage, runtime tampering, and platform-specific attack surfaces. Optimised for fintech and regulated mobile-first products.
API Security
API Penetration Testing
Comprehensive OWASP API Top 10 coverage across REST, GraphQL, and SOAP. Broken object-level authorisation, IDOR, rate-limit bypass, mass assignment, excessive data exposure, and authentication flaws. Schema-driven test plans for documented and undocumented endpoints.
Infrastructure
External & Internal Network Testing
External attack surface enumeration, exposed services, and patch-level exploitation. Internal Active Directory attacks including Kerberoasting, AS-REP roasting, ACL abuse, lateral movement, and Domain Admin escalation. Segmentation verified with confirmed boundary tests.
Cloud Security
AWS, Azure & GCP Reviews
CIS Benchmark-aligned review across IAM, storage (S3/Blob/GCS), VPC/VNet, compute, secrets, and serverless. Live exploitation of misconfigurations to demonstrate impact. Multi-cloud and hybrid coverage with provider-specific attack patterns and Terraform/CloudFormation drift detection.
Advanced
Red Team & Phishing Assessments
Multi-week assume-breach engagements modelled on real adversaries (TIBER-UK and CBEST aligned). Spear phishing campaigns, physical access testing, persistent C2 with custom tooling, and full kill-chain demonstration. Suited for FCA-regulated firms and CNI operators.
METHODOLOGY
Built on Standards You’ll Recognise
Every penetration testing engagement at EJN Labs follows internationally-recognised methodologies, never an opaque black box. Our pentesters align web application testing to OWASP Top 10 and OWASP ASVS, infrastructure work to PTES (Penetration Testing Execution Standard) and NIST SP 800-115, and red team engagements to MITRE ATT&CK with TIBER-UK or CBEST framework alignment when required.
Mobile applications are tested against OWASP Mobile Top 10 with platform-specific extensions for iOS and Android. API penetration testing follows the OWASP API Security Top 10. Cloud security reviews apply CIS Benchmarks for AWS, Azure, and GCP, supplemented by hands-on exploitation. Our red team and phishing assessment engagements model real-world adversaries using TTPs catalogued in MITRE ATT&CK.
PTES
Penetration Testing Execution Standard, structured 7-phase methodology.
OWASP
Top 10, ASVS, Mobile Top 10, API Top 10, full coverage.
NIST SP 800-115
Technical guide to information security testing, US government baseline.
MITRE ATT&CK
Adversary tactics and techniques, basis for red team scenarios.
CIS Benchmarks
Configuration baselines for AWS, Azure, GCP, and operating systems.
CBEST / TIBER-UK
Bank of England intelligence-led red team frameworks for FCA-regulated firms.
WHY EJN LABS
The UK CREST Provider That Does More
Where most pen test firms hand you a PDF after four weeks, we deliver findings live, retest free, and treat your team as the audience.
CREST + IASME Accredited
Verified at crest-approved.org. Acceptable for FCA, NCSC, PCI DSS, SOC 2, ISO 27001 audits. Plus IASME Cyber Essentials certification body, bundle baseline + deep testing in one engagement.
24-Hour Startup
From signed scope to active testing in a single business day where required, including for incident response, audit deadlines, and regulator-driven timelines.
Live Findings, Not 4-Week PDFs
Critical issues reported during testing through our client portal, not held back for the final report. Your team can remediate while testing continues.
UK & International Pentesters
Every engagement performed by vetted UK and international pentesters, matched to your engagement based on your needs, security clearance, and compliance scope. Critical for data sovereignty, NDA enforceability, and regulator-aligned engagements.
Compliance-Ready Reports
Reports structured for FCA SYSC, ISO 27001 A.12.6.1, PCI DSS Requirement 11, SOC 2 CC4.1, and Cyber Essentials Plus. Findings mapped to your specific framework.
Free Retests Included
Verify remediation of every finding before close-out, included as standard, not a paid add-on. Until your environment passes, we keep testing.
OUR PROCESS
From Scope to Secure in 2–3 Weeks
Every engagement follows a predictable rhythm. You always know where we are, what’s next, and what’s blocking.
Scoping Call
30-minute technical scoping call to define scope, attack surface, methodology, rules of engagement, and timeline. We confirm fixed price before signing.
Active Testing
3–10 days of hands-on testing by CREST-certified pentesters. Daily status updates and live findings delivered to your portal as discovered.
Reporting & Walkthrough
Executive summary plus full technical report with CVSS scores, reproduction steps, screenshots, and specific remediation. 60-min walkthrough call included.
Free Retest
After your team remediates, we retest at no extra charge. Letter of attestation provided for compliance and audit submission.
LONDON & UK-WIDE COVERAGE
Trusted by London Financial Services and UK Critical Infrastructure
EJN Labs serves businesses across London, the South East, and the entire United Kingdom. For London-based engagements requiring on-site work, physical penetration testing, internal network assessments on air-gapped environments, wireless security assessments, our pentesters can be on-site within the M25 the next business day.
For UK-wide and remote engagements we deliver via secure VPN and our client portal. We support clients across sectors including FCA-regulated banks and fintechs, insurance firms requiring CBEST-aligned testing, law firms with privileged data confidentiality requirements, and SaaS companies pursuing SOC 2 and ISO 27001 attestation.
See our dedicated London penetration testing services page for sector-specific information including FCA-aligned testing for financial services, or read our complete UK penetration testing cost guide for indicative pricing across every test type.
SECTORS WE SUPPORT
Industries We Serve
- Financial services
FCA, PRA, banks, insurance, fintech, payments - Legal & professional services
Privileged data confidentiality, partner-tier compliance - SaaS & technology
SOC 2, ISO 27001, multi-tenant security - Healthcare & life sciences
UK GDPR, NHS supply chain, patient data protection - Retail & e-commerce
PCI DSS scope, card data environments - Critical national infrastructure
NCSC guidance, regulated CNI operators
COMPLIANCE READY
Reports Aligned to Every Framework You Need
EJN Labs reports are structured for direct submission to your auditors and regulators. Findings are mapped to specific control references in each framework so your audit team doesn’t do the translation work.
FCA / PRA
SYSC, CBEST, TIBER-UK aligned reporting for regulated UK financial services.
ISO 27001
Findings mapped to A.12.6.1 technical vulnerability management controls.
SOC 2
Type I & Type II evidence for CC4.1 monitoring and CC7.1 system operations.
PCI DSS
Requirement 11 penetration testing across CDE, segmentation, and applications.
Cyber Essentials Plus
Direct certification, we’re an IASME-approved certification body.
UK GDPR
Article 32 testing, “regular testing of the effectiveness of security measures.”
LATEST INSIGHTS
From Our Cybersecurity Research
Practical guides on penetration testing, compliance, and the threats UK businesses are facing now.
-
VAPT Testing UK: Complete Guide to Vulnerability Assessment & Penetration Testing
Read article →: VAPT Testing UK: Complete Guide to Vulnerability Assessment & Penetration TestingVAPT testing — Vulnerability Assessment and Penetration Testing — combines two distinct security activities into a single coordinated…
-
How Long Does a Penetration Test Take? UK Guide 2026
Read article →: How Long Does a Penetration Test Take? UK Guide 2026“How long does a penetration test take?” is one of the most common questions we get during scoping…
-
CREST vs CHECK Penetration Testing: Which Should UK Businesses Require?
Read article →: CREST vs CHECK Penetration Testing: Which Should UK Businesses Require?CREST and CHECK are the two most-cited UK penetration testing accreditations — and the most commonly confused. They…
-
Cyber Essentials Plus: What Penetration Testing Is Required?
Read article →: Cyber Essentials Plus: What Penetration Testing Is Required?Cyber Essentials Plus is the UK government’s premier baseline cybersecurity certification — and one of the most common…
-
Network Penetration Testing Checklist: 2026 Complete Guide
Read article →: Network Penetration Testing Checklist: 2026 Complete GuideA network penetration test is only as good as its preparation. The most common reasons tests fail to…
-
Penetration Testing Cost UK: 2026 Pricing Guide
Read article →: Penetration Testing Cost UK: 2026 Pricing GuideThe single most common question we get before a scoping call: “How much does a penetration test cost…
EXPLORE MORE
Everything You Need Before Commissioning a Test
Service pages, pricing guides, comparison articles, the resources our clients use to make confident, informed decisions.
SERVICES
Penetration Testing Services
STANDARDS & CERTS
Certifications & Standards
FREQUENTLY ASKED
Everything UK Businesses Want to Know
If you don’t see your question here, ask us on a 30-minute scoping call.
How much does a penetration test cost in the UK?
Penetration testing in the UK typically ranges from £1,500 for a small web application to £50,000+ for a complex red team engagement. Most standard engagements (web app, infrastructure, or cloud security review) fall between £3,000 and £8,000. CREST-certified firms cost 20–40% more than non-certified providers. See our complete UK pricing guide.
What kind of penetration testing service do I need?
It depends on your assets, risks, and compliance requirements. SaaS companies typically need web application and API testing. Financial services need internal network and Active Directory tests aligned to FCA expectations. Cloud-native businesses benefit from AWS/Azure/GCP security reviews. Mobile-first products need iOS/Android app testing. We map your infrastructure to the right testing types in a 30-minute scoping call.
Will this help us meet compliance requirements?
Yes. Penetration testing is a requirement or strong recommendation under ISO 27001 (A.12.6.1), Cyber Essentials Plus, PCI DSS Requirement 11, SOC 2 (CC4.1, CC7.1), and FCA SYSC. We tailor methodology and reporting format to align with these frameworks so you can use our reports directly in audits or board reports.
How long does a penetration test take?
A typical engagement takes 2–3 weeks end-to-end including scoping, active testing (3–10 days), and reporting. Smaller scopes complete in 2 weeks; complex multi-app or infrastructure tests run 3–4 weeks. Red team engagements run 6–12 weeks. We provide a specific timeline at the end of the scoping call. See our timeline guide.
Who performs the test? Are they CREST or CHECK certified?
Our pentesters are experienced UK-based professionals holding CREST certifications relevant to their discipline (CRT, CCT INF/APP, CCSAM where applicable). EJN Labs is also a CREST-approved company, verify our company accreditation directly at crest-approved.org. SC clearance is available where required for sensitive sectors.
What happens if you find something critical?
Critical findings are reported immediately during testing, not held back for the final report. We notify your designated technical contact, suggest mitigations, and pause testing if the finding represents an active risk. Our goal is to help you contain and remediate quickly, including retesting once fixes are deployed.
Ready to Test Your Security Like an Attacker Would?
Tell us what you need to test. 30 minutes with a CREST-CREST-certified pentester, fixed-price quote, no sales pipeline.
