Penetration Testing Services for UK Businesses & Charities
Find out how an attacker could exploit your network before they do
Bunker’s penetration testing service identifies vulnerabilities, validates whether weaknesses can be exploited and gives you clear priorities for remediation.
Test. Validate. Improve.
Internal and external network penetration testing, practical findings and clear remediation guidance.
UK-based IT & cyber security partner
Bunker helps organisations understand security weaknesses and turn test findings into practical remediation.
Clear remediation priorities
Understand which vulnerabilities create the greatest risk, with clear findings and practical recommendations.
Internal & external testing
Test your network from both an external attacker perspective and from inside your environment.
Repeatable testing
Retest after remediation and schedule regular testing as your infrastructure and threats change.
A Five-Stage Penetration Testing Framework
A practical process that takes you from defining the test through to remediation and retesting
Define the networks, systems, IP ranges and objectives of the penetration test.
Perform internal and/or external network penetration testing to identify potential weaknesses.
Safely test whether identified vulnerabilities can be exploited and what access they could provide.
Translate findings into clear executive insight, technical evidence and prioritised remediation actions.
Validate remediation, confirm weaknesses have been addressed and measure security improvement.
Vulnerability Scanning Is Not the Same as Penetration Testing
Finding a possible weakness is useful. Understanding whether it can be exploited — and what that could mean for your organisation — provides much deeper insight.
Identifies potential vulnerabilities
Scans systems and networks for known security weaknesses, misconfiguration, exposed services.
SHOWS WHAT MAY BE VULNERABLE
Provides a list of potential vulnerabilities that can be reviewed, prioritised and investigated further.
Primarily detection-focused
Identifies potential weaknesses, but does not necessarily demonstrate how an attacker could exploit them.
USEFUL FOR ROUTINE SECURITY VISIBILITY
Regular scanning can help identify new vulnerabilities as systems, software and infrastructure change.
PEN TESTING AS A SERVICE
Cyber Risk Doesn’t Stand Still. Why Should Your Testing?
Instead of treating penetration testing as a once-a-year compliance exercise, Bunker can provide repeatable testing to identify new weaknesses and measure improvements over time.
Choose the Testing Frequency That Fits Your Risk
ONE-OFF
Ideal when you need an independent assessment of your current network security.
Best for:
- Annual security review
- Compliance requirements
- Before/after major changes
You receive:
Test findings + remediation report
QUARTERLY
Test every three months to identify new weaknesses and verify previous remediation.
Best for:
- Growing organisations
- Changing infrastructure
- Higher-risk environments
You receive:
4 tests per year + progress tracking
MOST POPULAR
ONGOING
Move beyond annual testing with a repeatable programme that identifies weaknesses as your environment evolves.
Best for:
- Security-conscious organisations
- Larger or complex networks
- Continuous risk reduction
You receive:
Ongoing testing + remediation validation
THE TECHNOLOGY
Powered by Vonahi vPenTest
Bunker’s automated network penetration testing is powered by specialist penetration testing technology. Bunker provides the customer relationship, scoping, interpretation, remediation guidance and ongoing security improvement around the testing process.
The result: repeatable security testing combined with practical support to help your organisation act on what is found.
Automated network penetration testing
Internal testing · External testing · Exploitation validation · Executive reporting · Technical findings · Retesting
Not sure how often you should test?
What is penetration testing?
Penetration testing is a security assessment that identifies vulnerabilities and then safely tests whether those weaknesses can be exploited.
Unlike a vulnerability scan, which primarily identifies potential vulnerabilities, a penetration test goes further by demonstrating how weaknesses could potentially be used by an attacker and what systems or data may be exposed.
Bunker provides internal and external network penetration testing, followed by clear findings and prioritised remediation guidance.
What is the difference between a vulnerability scan and a penetration test?
A vulnerability scan identifies potential security weaknesses, such as known vulnerabilities, exposed services and configuration issues.
A penetration test goes further by safely attempting to exploit identified weaknesses to understand whether they present a genuine security risk and what an attacker could potentially achieve.
Both have value, but penetration testing provides deeper validation of your organisation’s security exposure.
What is the difference between internal and external penetration testing?
External penetration testing assesses systems and services that are accessible from the internet, helping identify weaknesses that an external attacker could potentially target.
Internal penetration testing assesses what could happen from within your network — for example, if an attacker gained an initial foothold or an unauthorised device obtained network access.
Depending on your environment and objectives, Bunker can perform internal testing, external testing or both.
How often should we carry out penetration testing?
The right frequency depends on your organisation’s risk, infrastructure, rate of change and security requirements.
Some organisations use an annual penetration test, while organisations with frequently changing infrastructure or higher security requirements may benefit from quarterly or more regular testing.
Bunker can provide both one-off and repeatable penetration testing.
What do we receive after a penetration test?
You’ll receive findings designed to explain what was discovered, the associated risk and what should be fixed first.
This can include an executive overview, detailed technical findings, evidence of identified vulnerabilities and prioritised remediation recommendations.
Once fixes have been implemented, retesting can help verify that important weaknesses have been addressed.
How much does penetration testing cost in the UK?
A typical Bunker penetration test costs between £2,000 and £5,000, depending on the size, complexity and scope of the environment being tested.
The final cost can vary depending on factors such as whether you require internal testing, external testing or both, the number of systems and networks in scope, and whether you require one-off or repeatable testing.
Bunker agrees the scope before testing begins, so you’ll receive a clear quotation based on your environment and testing requirements.
For most organisations, we recommend starting with a defined scope so we can identify the most appropriate level of testing without testing — or charging for — more than you need.
