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Penetration Testing Services

Identify vulnerabilities in your systems, networks, applications, and cloud infrastructure.

Best Cyber Security Company 2021

Best Cyber Security Company 2021

Best Cyber Security Company 2022

Best Cyber Security Company 2022

Crest Accreditation

What is a penetration test?

Penetration testing (or pentesting) involves finding and exploiting vulnerabilities within your IT systems, websites, applications and cloud infrastructure. It’s sometimes referred to as ‘ethical hacking’. Penetration testers find methods attackers use to gain access to your assets.

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.

Why your organisation needs a pentest

With an ever-changing IT landscape and an evolving cyber threat, regular pentesting can help you to:

  • 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
  • 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
  • Securely implement technologies or solutions that would otherwise dramatically change your technical environment and/or increase your organisation’s attack surface.

Our approach to penetration testing

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, which affirms our expertise and professionalism in delivering these specialised services. Each of our pentesting services adheres to the following assessment methodology:

Penetration testing starts with building a map of the target environment, system or application (known as the ‘attack surface’) to establish all potential avenues of attack. We obtain detailed information about the attack surface using active and passive information gathering, such as Open-Source Intelligence (OSINT) gathering, port scanning and non-intrusive service enumeration techniques.

We perform further scanning of your applications, services and systems to discover helpful information about the configuration of your assets. This process will often reveal technologies and versions of software in use, exposed sensitive files, misconfigured services and other facts about your assets that require further investigation.

With a vast amount of information gathered about the target(s) under assessment, we combine various manual and automated techniques to identify attack vectors.

Our team’s expertise allows us to discover hard-to-find vulnerabilities and plan an effective strategy to demonstrate exploitation.

We leverage our advanced technical capability to simulate the exploitation of discovered vulnerabilities using a mix of public and internal tools, scripts and offensive techniques.


Once we’ve achieved a foothold via successful exploitation, our team replicates the attack lifecycle to identify and compromise other targets of value within the context of exploited systems.

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.

Penetration test reporting

To maximise the value of a penetration test, acting upon the vulnerabilities identified during an engagement is essential. Our penetration testing service provides a detailed technical report to assist you in making these critical improvements. Our technical penetration testing reports include the following:

  • A succinct management summary with key statistical information
  • A technical overview covering the most important considerations
  • Full technical details of every vulnerability discovered, including the assessed impact
  • Precise vulnerability weightings to aid in prioritising remediation
  • Detailed and practical guidance for technical remediation of each vulnerability

We understand that technical reports can be challenging to consume, so ours are tailored heavily, based on feedback from our valued customers. Our consultants are always available to discuss your questions once you’ve received the report.

Types of Penetration Test

Penetration testing is a broad term covering several types of offensive cyber security assessment. Our team provides the following penetration testing services:

Our network and infrastructure penetration testing investigates your internal and external networks and systems for vulnerabilities. It also simulates exploitation safely to show the potential impact. We have extensive knowledge of Windows and Unix environments and a vast range of enterprise networking and security technologies.

A website pentest assesses your web applications and supporting components, such as APIs, for security vulnerabilities. Using similar tools and techniques to legitimate threat actors, we find vulnerabilities that may be exploited to compromise your application data and/or users.

Mobile application pentesting provides an in-depth review of your applications’ security to ensure the data processed is protected. Our team has vast experience in assessing applications across iOS, Android and Windows platforms, and many mobile development frameworks such as React Native, Flutter and Xamarin.

Cloud penetration testing attempts to find misconfigurations that may expose your cloud systems and data to attack. It’s performed against environments hosted by a cloud service provider, such as Amazon Web Services (AWS), Google Cloud or Microsoft Azure.

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Why choose Sentrium?

Our experienced and CREST-certified penetration testing team ensures we offer the required level of expertise to provide an accurate and comprehensive penetration testing service.

Our consultants will work closely with you to determine the most appropriate testing and clarify any questions you may have.

Our communication-focused client-first approach ensures that our consultants are always on hand to answer any questions you may have. We pride ourselves on establishing and building strong and collaborative long-term relationships with our clients.

Frequently Asked Questions

Penetration testing is the process of assessing an IT system’s security using similar techniques and tools that a malicious actor would use. It can help you to understand the vulnerabilities affecting IT systems and how your organisation may be affected by those vulnerabilities if an attacker targets them.

Once we’ve established the scope of the assessment, our CREST-accredited team provides penetration testing services using an industry-standard methodology. First, a pentester uses reconnaissance techniques to enumerate information about the target environment. They will then fingerprint applications, services and systems, gathering further information for exploitation and lateral movement. This process is repeated to gain the highest-level access to the targets to demonstrate the impact of an attempted compromise.

Pentesting should typically be done annually, especially where there are certification or regulatory requirements to conduct penetration testing. However, there are some cases where pentesting should be performed more often, such as where substantial changes are made to networks, custom software or applications have frequent development releases, or new products or services are launched.

Our skilled CREST-approved penetration testers perform pentesting to simulate attacks using the same techniques used by malicious adversaries.

This depends on the agreed scope of the penetration testing engagement. For example, the size of the network under review, the type of network, and whether any pentesting is performed authenticated may affect the length of the assessment.

This depends on the scope and how many days it will take to complete the project. Contact us for a no-obligation quote where we can learn your requirements and provide a detailed proposal for penetration testing services.

Our skilled pentesters follow strict guidelines in accordance with legal and technical standards to ensure minimal disruption to your business while performing a penetration test. Our consultants work with you to establish high-risk systems and operational concerns during the scoping process.

CREST is an international not-for-profit accreditation and certification body representing and supporting the technical information security market. Companies can become a CREST member and apply for CREST-accredited services. The application requires a rigorous assessment of companies’ processes, data security and service methodologies to ensure they adhere to a best practice standard.

Yes! Sentrium has achieved the standards set by CREST and is a CREST-approved penetration testing service provider. We’re proud to offer services that achieve CREST’s extremely high standards of quality and professionalism, which are recognised internationally.

Working with a CREST-approved penetration testing provider ensures you’re in safe and experienced hands. You should have the confidence that your penetration test is thorough and comprehensive. Your provider must conduct a technically comprehensive test that will adhere to information security and quality assurance requirements set by CREST.

Once your penetration test is complete, we compile a detailed report containing the identified vulnerabilities, what risks they pose and recommendations on how to remediate them. Once we’ve delivered the report, our team will be available to discuss the results in detail and answer any questions.

Our clients

Adam and James have been great to work with. Very clear communication from start to finish making the process very easy to complete whilst taking the time to understand our needs and queries.

Director, Software as a Service (SaaS) Company

Sentrium has been incredibly helpful in reviewing and improving our cyber security efforts! Working with Adam has been a breeze from the start, as he always makes sure to keep in mind our budget and understanding of the subject matter. For us, cyber security went from being an enigma to something we can actually tackle with confidence!

Project Manager, Charity Sector

I’ve been impressed with the speed and quality of the services provided by Sentrium. Great communication and engagement with the team, and a very professional and flexible approach throughout. I’ll certainly be looking to use Sentrium again in the future!

Head of Technology Risk & Security, Financial Services

Common vulnerabilities

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 to identify and remediate these vulnerabilities, enabling organisations to protect the assets that malicious actors may target. Our penetration tests frequently identify vulnerabilities such as:

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.

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.

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.

Common weaknesses include injection vulnerabilities, such as command injection, database (SQL) injection and cross-site scripting (XSS). These vulnerabilities often seriously impact an application’s security and the sensitive data it processes.

Cryptographic failures include the improper use of unsecured protocols, ciphers, certificates and legacy encryption technologies. These weaknesses may allow a suitably positioned malicious actor to intercept sensitive information as it traverses a network.

Get in touch with our experts to discuss your needs

Phone +44(0)1242 388634 or email [email protected]


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