PENETRATION TESTING SERVICES
CREST-certified penetration testing services, delivered by UK-based experts, tailored to your business needs.
Trusted by leading organisations
Why choose Sentrium for
penetration testing?
Expert-led testing for
clarity and compliance
Effective penetration testing goes beyond identifying vulnerabilities. It should provide clear insight into the risks that matter most and practical guidance to help you address them.
Our consultants deliver thorough, tailored assessments mapped to your environment and risk profile. Whether you’re seeking compliance or deeper assurance of your security posture, we provide the clarity to make decisions with confidence.
- UK-based CREST-certified consultants
- Direct access to the consultants performing your assessment
- Clear, actionable reporting with practical remediation guidance
- Responsive delivery and transparent communication
- Supporting organisations of all sizes, from startups to enterprise
What is a penetration test and how
does it protect your organisation?
Identify vulnerabilities before
attackers can exploit them
Penetration testing (also known as pentesting or ethical hacking) is the process of identifying and safely exploiting vulnerabilities in your organisation’s digital environment. This includes testing your web applications, mobile apps, cloud infrastructure, and internal and external networks.
Trusting the effectiveness of your organisation’s IT security controls is crucial to mitigating risks and preventing malicious access to your systems and data. Pentesting enables you to remediate vulnerabilities and improve your organisation’s security strategy.
How do we ensure your cyber security stays ahead of evolving threats?
Why your organisation needs
a pentest to stay secure
STAY AHEAD OF CYBER THREATS
WITH PROACTIVE TESTING
- Gain assurance in your IT security controls’ effectiveness
- Prevent malicious actors from accessing or making changes to your systems and data
- Maintain compliance with data regulations to protect personally identifiable information (PII) within your IT environment
- Prevent data breaches or loss
- Prove to customers or other stakeholders (i.e., during a business acquisition) that products, services or internal security practices are appropriate to protect their interests
Our approach to delivering
effective penetration testing services
Expert-driven testing
with precision and context
Our consultants conduct rigorous penetration testing of your networks, systems and applications using industry-standard practices. We are CREST-approved and certified to the UK penetration testing discipline. Each of our pentesting services adheres to the following assessment methodology:
Reconnaissance
Pentesting starts with mapping the target environment, system or application to establish the avenues of attack. We obtain detailed information about the attack surface using active and passive information gathering.
Fingerprinting
We perform further scanning to find details about your assets. This process often reveals versions of software, exposed sensitive files, misconfigured services and other facts that require further investigation.
Analysis
With a vast amount of information gathered about the target(s), we combine manual and automated techniques to find attack vectors. Our expertise allows us to discover vulnerabilities and demonstrate exploitation.
Exploitation
We use our advanced technical capability and a mix of tools, scripts and offensive techniques to simulate the exploitation of vulnerabilities. We’ll communicate with you before we start to ensure you’re happy for us to continue.
Lateral Movement
Once we’ve achieved a foothold via successful exploitation, our team replicates the attack lifecycle to find and compromise other targets of value within the context of exploited systems.
Cleanup
Once we’ve obtained evidence of the successful attack chain, we remove any artefacts or changes applied to the system, restoring it as closely as possible to its original state.
Clear and actionable penetration
test reporting for your business
Reports that prioritise
risks and provide practical
remediation guidance
Every penetration testing engagement includes a concise, well-structured report designed to help you understand and address the risks identified. You’ll receive:
- A clear summary for stakeholders, highlighting key risks and priorities
- Full technical details of each vulnerability, including severity ratings
- Practical step-by-step remediation guidance
- Screenshots and reproduction steps where necessary
- A free retesting window to validate fixes
Our consultants are available to walk you through the findings and answer any follow-up questions, helping you turn insight into action.
Types of penetration testing
CREST-approved
penetration testing services
Penetration testing is a broad term covering several types of offensive cyber security assessment. Our team provides the following penetration testing services:
Network penetration testing
Our testing simulates attacks on your internal and external networks to expose misconfigurations, outdated systems, and other exploitable weaknesses.
Website penetration testing
We identify vulnerabilities in websites, portals, and APIs, from OWASP risks to logic flaws, helping you secure your online assets and meet compliance requirements.
Mobile application penetration testing
We test iOS and Android apps for security flaws in both the app and backend APIs, uncovering issues like insecure storage and weak authentication.
Cloud penetration testing
We identify cloud-specific misconfigurations and vulnerabilities across platforms like AWS, Azure, and GCP, ensuring your setup is resilient and secure.
Vulnerability assessment
A cost-effective way to find known vulnerabilities using automated scans and expert review, ideal for prioritising fixes and improving security posture.
Red teaming
A realistic attack simulation that tests your organisation’s defences, combining social engineering, stealth tactics, and advanced intrusion techniques.
Internet of Things (IoT)
Examines IoT devices and ecosystems for exploitable vulnerabilities. Simulates attacks safely to highlight risks and improve ecosystem resillience.
Artificial Intelligence (AI)
Simulate an attack against LLM and GenAI applications, environments and data flows to discover your AI vulnerabilities and assess AI risks in your organisation.
Common vulnerabilities uncovered
through penetration testing
Exposing weaknesses that
could threaten your
systems and data
Despite growing awareness and understanding of cyber security in all aspects of business, common vulnerabilities and weaknesses still affect many applications, networks and services. Sentrium’s CREST-approved penetration testing services help identify and remediate these vulnerabilities, enabling organisations to protect assets that malicious actors may target. Our penetration tests often find vulnerabilities such as:
Insecure configurations
Systems, applications, software packages and cloud environments can be highly configurable. Misconfigured features can have a disastrous effect on a service’s overall security posture.
Outdated and vulnerable software
Patching may be a basic security principle, but the reality can be incredibly complex. Discovering outdated and unsupported software during a penetration test is not unusual. Unsupported software no longer receives security patches and is commonly targeted by opportunistic attackers.
Business logic flaws
Incorrect assumptions about how users will interact with a system can result in logic flaw vulnerabilities. In web applications, this is often seen in excessive reliance on client-side controls, which allow the malicious manipulation of workflows.
Insecure programming practices
Common weaknesses include injection vulnerabilities, such as command injection, database (SQL) injection and cross-site scripting (XSS). These vulnerabilities often seriously affect an application’s security and the sensitive data it processes.
Cryptographic failures
Cryptographic failures include the improper use of unsecured protocols, ciphers, certificates and legacy encryption technologies. These weaknesses may allow a hacker to intercept sensitive information as it moves across a network.
Frequently asked questions
What are penetration testing services?
Penetration testing services assess the security of an organisation’s systems, networks, applications, or cloud environments using techniques similar to those employed by real-world attackers. The objective is to identify and safely validate security vulnerabilities before they can be exploited. Unlike automated vulnerability scanning, penetration testing combines manual analysis with technical expertise to uncover complex security weaknesses and provide practical recommendations to help organisations reduce risk, strengthen security controls, and support compliance requirements.
How often should a penetration test be performed?
Penetration testing should be done annually at minimum to maintain an effective understanding of your security posture. More frequent testing may be required following significant infrastructure changes, major application updates, cloud migrations, or to meet regulatory and compliance requirements such as PCI DSS, ISO 27001 or SOC 2.
How long does a penetration test take?
The duration of a penetration test depends on the scope and complexity of the assessment. Most engagements can be completed within 1 to 3 weeks, including testing and reporting. Factors such as the size of the environment, application complexity, authentication requirements and scheduling availability may all influence the full timeline.
Will a pentest disrupt our services?
Penetration testing is designed to minimise disruption to normal business operations. During scoping, our consultants work with you to identify critical systems, operational constraints and testing windows. Testing is then planned and performed in a controlled manner to reduce risk while providing meaningful security assurance.
Do you provide retesting after vulnerabilities are fixed?
Yes! We include retesting of high and critical findings for up to 30 days after the completion of your penetration test. This allows us to verify that remediation activities have been successful and provides assurance that identified vulnerabilities have been effectively addressed.
What happens after a penetration test?
Once testing is complete, you’ll receive a detailed report outlining the vulnerabilities identified, the associated risks and practical remediation recommendations. High and critical findings are communicated as soon as they are identified, allowing remediation to begin before the final report is delivered. Our consultants are also available to discuss the results and answer any questions. Learn how to make the most out of your pentest report.
Should testing be performed in staging or production?
Where possible, we recommend testing a staging environment that accurately reflects production. This reduces operational risk while providing meaningful security assurance. Nevertheless, some compliance frameworks and regulatory requirements require testing of production systems, particularly within highly regulated sectors such as financial services.
How quickly will I receive my penetration test report?
Reports are usually delivered in 3–5 working days. High and critical findings are communicated as soon as they are identified, allowing remediation activities to begin before the final report is delivered.
How much does a penetration test cost?
The cost of a penetration test depends on the scope, complexity and objectives of the assessment. Factors such as the size of the environment, number of systems, application functionality, authentication requirements and testing approach can all influence pricing. Smaller assessments may cost a few thousand pounds, while large enterprise environments and complex applications can require a significantly larger investment.
Do I need a CREST-certified penetration testing provider?
Not always, but many organisations choose a CREST-accredited provider to ensure testing is delivered to recognised industry standards. Certain compliance frameworks, procurement requirements and customer contracts may also require or strongly recommend the use of a CREST-accredited penetration testing company.
What is CREST accreditation?
CREST is an internationally recognised not-for-profit accreditation and certification body for the cyber security industry. CREST-accredited companies are independently assessed against rigorous standards covering areas such as technical capability, service delivery, quality management and information security, helping organisations identify trusted providers for security testing services.
Why should I use a CREST-approved pentesting company?
Using a CREST-accredited penetration testing provider gives confidence that your assessment will be delivered to recognised industry standards. CREST members are independently assessed for their technical capability, quality management and information security practices, helping organisations obtain reliable and consistent security testing. Learn more about choosing the right penetration testing partner.
