CREST-Certified Penetration Testing Services in UK

Protect your digital assets with CREST-certified penetration testing in the UK. RedSecLabs delivers expert-led, ethical hacking to identify and fix real-world vulnerabilities, from web apps to internal systems and compliance audits.

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Provide your details below or reach out to us for a tailored quote based on your project requirements.

What type of testing do you require?

UK-based CREST member · QSA-aligned methodology · Same-day scoping response · Executive + technical reports · Retest included
pentesting-services

Penetration Testing Services We Offer Across UK

As every organisation’s attack surface is different, that's why we offer a comprehensive range of CREST-certified penetration testing services in UK tailored to your company's infrastructure, applications and vulnerabilities.

Active incident

Need incident response support?

If you have an active security incident, ransomware, business email compromise, suspected data exfiltration, web compromise, our senior IR consultants can engage same-day. Retainer clients use the priority channel agreed in scoping.

Looking for malware removal and incident analysis services? Our incident response team offers flexible schedules for urgent support and fast recovery.

99% Recovery Rate
24/7 Expert Support

Why Penetration Testing by RedSecLabs?

Our Scoping Process

We help you plan a penetration test that meets your goals, ensuring that you get the most from your investment.

Our Human-Centered Approach

Just like real hackers, our pen testers use unpredictable methods that a vulnerability scan can't simulate.

Our Actionable Reports

We'll describe what each vulnerability means in your specific environment so you can make effective remediations.

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How Much Will Your Penetration Test Cost?

Stop guessing. Use our interactive estimator to get a tailored cost estimate in under 2 minutes; based on your scope, infrastructure type and testing requirements.

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Takes about 90 seconds

Penetration Test Estimator
Scope Web Application
Test Type Black Box
User Roles 3 roles
Estimated Cost £2,800, £4,500
Duration 3, 5 days
6+ Test types covered
2 min Average completion
Free No commitment

Our CREST-Certified Penetration Testing Process

At RedSecLabs, we follow a diligent and standards-aligned approach to ensure our penetration tests are thorough and actionable. Our senior testers hold CREST CRT or CCT certifications, meaning our techniques meet globally recognised standards for ethical hacking and technical assurance. We make sure that the findings are categorized using industry standards such as OWASP Top 10, NIST, PTES, CWE and MITRE ATT&CK. Our advanced pentesting process includes.

Scoping & Objective Setting

We start by understanding your environment, goals and risk appetite. Are you testing for regulatory compliance? Pre-launch validation? A specific threat scenario, or something else?

Reconnaissance & Intelligence Gathering

This is where we gather publicly accessible information about your systems, employees, domains and digital footprint to create a threat map similar to those made by attackers.

Vulnerability Analysis

To uncover exploitable weaknesses in your infrastructure and applications, our team uses both automated tools and manual analysis.

Exploitation (Controlled & Safe)

Here, we attempt to carefully and ethically exploit the discovered vulnerabilities to indicate real-world risks without harming your systems or data.

Post-Exploitation & Risk Validation

Our assessment measures what a successful exploit could lead to. Could an attacker access sensitive data, take control of your network or disrupt critical operations?

Reporting & Remediation Guidance

Our comprehensive report not only identifies issues, but also offers a remediation roadmap, prioritizing each finding by risk level, business impact and complexity of resolution

pentest-report-sample.pdf

RedSecLabs · Confidential

FREE
  • Executive Summary
  • Vulnerability Findings with CVSS Scores
  • Proof-of-Concept Screenshots
  • Risk Severity Breakdown
  • Remediation Guidance & Roadmap
Critical
3
High
6
Medium
9
Low
5
Free Sample Report

See Exactly What a CREST-Certified Report Looks Like

Before you invest in a penetration test, see what you're getting. Our sample report shows you the exact format, depth and quality of findings our CREST-certified testers deliver, including real vulnerability writeups, CVSS scoring and remediation guidance.

Industry-standard CVSS v3.1 scoring
Executive summary for non-technical stakeholders
Actionable remediation steps per finding
Accepted by regulators, auditors & clients
Download Free Sample Report

PDF format  ·  Instant access

Get a Penetration Test Quote Now

Ensure the safety of your network, applications, and systems with RedSecLabs, a trusted name among Crest-accredited penetration testing companies in the UK.

We combine human expertise with advanced automated tools to pin down real-world vulnerabilities before cybercriminals do.

  • Deep understanding of attacker techniques
  • In-depth threat analysis with clear remediation advice
  • Post-engagement support to help you fix issues fast
  • Transparent, competitive pricing with no surprises
  • Rated 9+/10 by clients across multiple industries
  • Crest-accredited penetration companies in the UK

When Should You Conduct a Penetration Test for your UK business?

We recommend scheduling regular tests based on your company's environment, industry regulations and the security posture of your organization. When it comes to penetration testing, timing is critical to stay ahead of cyber threats. Many organisations delay testing until after a breach, but by then, it’s too late.

After Major Infrastructure Changes

If you have recently migrated to the cloud or upgraded your firewall or VPN, you should test now to ensure new systems or configurations haven’t opened security holes. Because any significant change can introduce potential vulnerabilities

Before Going Live with a New Web or Mobile Application

Thorough security testing is essential to avoid exposing your users or business to zero-day risks after launch. Deploying without it can lead to critical breaches, whether it's a customer portal, e-commerce site, or internal tool.

After a Security Incident or Breach

Once you’ve responded to an attack, it’s crucial to assess what was exploited and whether the vulnerabilities still exist. It's important to validate fixes today and prevent repeat incidents through root cause analysis.

Before a Compliance Audit or Vendor Assessment

Proactive security testing is key when preparing for third-party audits or supply chain entry, as it builds trust and credibility. Penetration testing before any compliance review or vendor assessment helps prove due diligence to clients, partners, and regulators.

When Merging, Acquiring or Expanding A Company

Cyber risks increase during mergers, acquisitions and expansions, necessitating penetration testing to prevent inheriting vulnerabilities or leaving blind spots as your organization grows

On a Regular Schedule (Quarterly or Annually)

Pen testing isn’t a one-off task, because threats evolve and so does your IT landscape. Most compliance standards (like ISO 27001, PCI-DSS and GDPR) require recurring assessments to maintain ongoing protection, meet regulatory requirements and track improvements over time.

Why is RedSecLabs One of the Most Trusted Penetration Testing Companies in the UK?

We are the top priority for organizations across the UK when security truly matters to them.

Contact us today and talk to one of our experts to discover what sets RedSecLabs apart from other penetration testing companies in the UK and across the globe.

What our Customer are Saying

We are trusted by organisations across diverse industries to meet their needs

“Working as a cybersecurity consultant, RedSecLabs has improved the security posture of Bykea by formulating a Cybersecurity Framework for Developers and had worked towards incorporating DevSecOps. It had also contributed towards improving Bykea's vulnerability disclosure program (VDP) by preparing end-to-end process documents and has developed relevant policies to facilitate the organisation's security posture. Given, RedSecLabs' broad experience in a wide range of cybersecurity domains, it can be a tremendous asset to any organisation.”

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Muneeb Maayr CEO, Bykea
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“RedSecLabs was a pleasure to work with. Its knowledge of the cybersecurity space was impressive. It helped us build a specific capability we'd been looking at for a while. It was responsive to our questions and quick to turn the work around. It also took our feedback on board and made changes to the work where appropriate. We'd definitely work with RedSecLabs. Ed Hutchinson The Independent

“The team at RedSecLabs is very communicative and responds quickly. They are highly knowledgeable in what they do and make suggestions when needed. I felt very comfortable with RedSecLabs performing the pen test in our environment and felt like we were in good hands. I would highly recommend RedSecLabs for any pen testing jobs you may have. ”

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Aleks Daranutsa Nhebo
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“We are very pleased with the services provided by RedSecLabs. They were highly professional, and their work was outstanding. The team at RedSecLabs went above and beyond during the course of the project. When an unforeseen issue arose mid-project, they took the initiative and helped us repair an additional issue, unrelated to the original scope. This saved us a considerable amount of time and resources. We will continue working with RedSecLabs on future projects and look forward to a long-term partnership.”

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Bill Fahy Atlantic Firearms
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“RedSecLabs has been instrumental in solving Work Generations Cybersecurity challenges. Their expert team provides unparalleled protection and swift responses to potential threats. Their innovative solutions and dedication to client security are truly commendable. Highly recommend RedSecLabs for high-quality cybersecurity services.”

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Shawana Iftikhar Work Generations
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CREST-Aligned Penetration Testing in the UK with Real-World Experience

Our penetration testers are CREST-certified, and most of them hold additional credentials including OSCP, CISSP and CEH. They bring frontline experience to every engagement, with backgrounds in ethical hacking, red teaming and cyber forensics.

UK-Based & Industry-Compliant

RedSecLabs operates from the UK and fully complies with data protection laws, including the GDPR and industry-specific standards such as ISO 27001, PCI-DSS and the NHS DSP Toolkit. We understand the local regulatory landscape, whether you’re a financial firm in London, an NHS organization or a tech startup in Manchester.

Business-Focused Remediation Guidance

Our reporting is business-first and focused on the outcome. We rank issues by real-world impact and help your teams implement practical and sustainable fixes.

Trusted by UK Enterprises, SMEs and Public Sector

At RedSecLabs, we offer cost-effective penetration testing without compromising on quality. Our pricing models are built to deliver maximum value for your budget, whether you're a growing startup or an established enterprise.

Competitive Pen Testing Prices

At RedSecLabs, we offer cost-effective penetration testing without compromising on quality. Our pricing models are built to deliver maximum value for your budget, whether you're a growing startup or an established enterprise.

Vulnerability And Remediation Management in the UK

At RedSecLabs, we don’t only help you identify vulnerabilities, but also assist you in fixing them. After the penetration test, we deliver a comprehensive, executive-ready report detailing every risk uncovered, prioritized by severity and real-world impact.

How We Prioritize Vulnerabilities

We utilize scoring systems such as the Common Vulnerability Scoring System (CVSS) along with contextual threat intelligence to identify the risks that are the most significant threat to your specific environment. This approach enables your team to prioritize addressing the most critical vulnerabilities first.

What’s Inside Our Penetration Test Report?

We provide you with a detailed report highlighting the risks, impacts and their best possible fixes. Our reports include:

  • A summary of all discovered vulnerabilities which are categorized by risk level
  • Screenshots, technical evidence and proof-of-concept (PoC) exploits
  • Root cause analysis and business impact explanations
  • Clear and actionable remediation steps tailored to your systems

What Happens After Penetration Testing Is Completed?

After handing over the report, RedSecLabs offers:

  • Remediation consultation sessions to guide your internal IT or dev teams
  • Ongoing support via secure communication channels
  • Re-testing of resolved vulnerabilities (in most engagements) to validate fixes and ensure security posture has improved

Benefits of Penetration Testing in the UK

Penetration testing is one of the most critical cybersecurity strategies that uncovers hidden threats. At RedSecLabs, we help organizations of all sizes stay resilient, reduce risk and build trust through targeted and realistic pen testing engagements

Strengthen Your Security Posture

Penetration testing identifies exploitable weaknesses in your systems, applications and configurations by simulating real-world attack scenarios, allowing you to fix them before they’re used against you.

Prioritize High-Risk Vulnerabilities

Pen testing helps you focus on what matters most, using contextual risk analysis to highlight vulnerabilities that pose the greatest threat to your business.

Meet Compliance and Regulatory Requirements

Regular pen testing plays a vital role in demonstrating due diligence and security accountability, whether you need to align with PCI-DSS, ISO 27001, GDPR, HIPAA, SOC 2 or FCA regulations.

Avoid Costly Breaches

Penetration testing offers a cost-effective layer of defense by proactively discovering and resolving critical flaws before they can be exploited.

Build Customer Trust

Your clients, partners and stakeholders need assurance that their data is secure. A third-party pen test from a trusted provider like RedSecLabs sends a strong signal that you take cybersecurity seriously

Improve Incident Response

Penetration testing exercises your detection and response capabilities, helping you identify gaps in SIEM, logging, alerting and response protocols. All of which are vital for reducing the impact of any real-world attack.

Frequently Asked Questions (FAQs) Answers

Vulnerability scanning uses automated tools to detect known issues, while penetration testing involves skilled experts actively exploiting vulnerabilities to assess real-world risk. Pen testing provides deeper insight and context.

It depends on the scope, complexity, and type of test. Small web app tests usually take 2,5 days, while full network or infrastructure tests may take 1,3 weeks. RedSecLabs provides timelines during project scoping.

Penetration tests are carefully coordinated to avoid disruption. Our experts follow strict guidelines and can work after-hours or in pre-production environments to minimize impact.

Costs vary based on scope, depth, and targeted systems. RedSecLabs provides transparent, competitive pricing tailored to your needs.

The report includes detailed findings (with CVSS scores), screenshots/evidence, business impact insights, remediation guidance, and an executive summary for stakeholders. It also helps improve long-term security and compliance.

Most penetration tests can be performed securely and effectively 100% remotely, including web apps, APIs, cloud environments, and external infrastructure.

CREST is a globally recognised accreditation body for cybersecurity organizations and individuals, mainly for penetration testing. Working with a CREST-certified team ensures the highest technical and ethical standards.

It depends on your assets and risk profile. Options include application testing, infrastructure testing, cloud, API, and mobile penetration testing. Our team can help select the right test.

At minimum, annually or after significant changes (new features, cloud migration). Regulated or high-risk organizations may require quarterly or more frequent tests.

Common vulnerabilities include:
  • Outdated software and unpatched systems
  • SQL injection and XSS in web applications
  • Weak authentication mechanisms
  • Misconfigured servers or cloud environments
  • Broken access controls
  • Sensitive data exposure
Before you decide
Download a sample report
A redacted RedSecLabs penetration test report. See the format, depth, and clarity your team will receive.
Talk to us
Book a scoping call
A 30-minute call covers realistic effort, timeline, and a fixed-scope quote. CREST-aligned methodology, UK-based testers.
What you receive

Every engagement includes

  • Scoping call. A 30-minute call to define scope, timeline, and authorisation boundaries.
  • Test plan. Written test plan covering targets, methodology, and rules of engagement.
  • Technical report. Detailed findings with reproduction steps, evidence, and remediation guidance.
  • Executive summary. Board-ready summary with risk ratings and business impact.
  • Audit-ready evidence. Findings letter formatted for auditors, customers, and supervisory authorities.
  • Retest letter. Free retest of remediated findings within agreed window. Confirmation letter included.
  • Remediation call. A call with our lead tester to walk through findings and remediation strategy.
How we deliver

Our process, end to end

  1. 1
    Scoping call & fixed-scope quote
    A 30-minute call. We define scope, targets, timeline. You get a fixed-scope quote within one working day.
  2. 2
    Test plan & authorisation
    Written test plan covering methodology, targets, and rules of engagement.
  3. 3
    CREST-aligned execution
    Senior tester runs the engagement. Critical findings flagged immediately during testing.
  4. 4
    Technical + executive report
    Detailed technical findings with reproduction steps. Board-ready executive summary.
  5. 5
    Remediation call & retest
    Walkthrough with our lead tester. Retest of remediated findings within the agreed window.
Engagement scope

What shapes the quote

Small scope
Focused scope, smaller surface. 5-7 working days.
Medium scope
Multi-role, several integrations. 8-12 working days.
Enterprise scope
Complex environment, compliance evidence. 12-25 working days.
Fixed-scope quote within 1 working day
No surprise invoices. We commit to a number before you commit to us.
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