External Penetration Testing
Simulate real-world attacks on your public-facing infrastructure before threat actors do. CREST-certified testers, human-led exploitation, actionable findings and fix validation included.
- Human-led testing
- Fix validation included
- Fixed-price quote
Illustrative example
Delivered by Techfident with our specialist cyber security partner — CREST & CHECK accredited penetration testers
Why it matters
Attack your own systems before attackers do
Most cyberattacks begin with the same flaw: an unpatched service, a weak firewall, a misconfigured remote access point. An External Penetration Test simulates a real attacker targeting your public-facing infrastructure — your websites, email gateways, VPNs, firewalls and cloud services.
Unlike automated vulnerability scans, penetration testing is human-led and involves actively attempting to exploit identified weaknesses. Our CREST-certified testers replicate the techniques, tools and mindset of real threat actors — finding what scanners miss: chained vulnerabilities, logic flaws and exploitable misconfigurations that only become apparent under controlled attack conditions.
Business benefits
Six reasons UK businesses invest in external pen testing
From regulatory compliance to board-level confidence, the outcomes of a well-executed penetration test go beyond the technical findings report.
Find exploitable risks before attackers
Detect weak spots in websites, VPNs, email gateways and cloud services — the same targets attackers probe every day.
Simulate real-world attack scenarios
CREST-certified testers replicate attacker behaviour using controlled techniques. Low-impact and stealthy — no disruption to operations.
Meet compliance requirements
Satisfy PCI-DSS, ISO 27001, Cyber Essentials Plus and cyber insurance requirements with a recognised third-party assessment.
Evidence for stakeholders
Clear evidence of due diligence for clients, insurers and auditors. Your report demonstrates proactive security investment.
Fix validation included
We go beyond the report — providing configuration support and fix validation to confirm gaps are genuinely closed, not just noted.
Prioritised by business impact
Risk ratings based on exploitability and business context — so your team knows exactly where to focus time and budget first.
Scope & process
What’s tested & how it works
Every engagement starts with a scoping call to define targets, agree rules of engagement and ensure the test reflects your real attack surface. No surprises — everything is agreed before testing begins.
Scoping & rules of engagement
Define targets, timelines and boundaries. Everything agreed upfront.
Reconnaissance & enumeration
Map your external attack surface exactly as an attacker would see it.
Controlled exploitation
Attempt to exploit identified vulnerabilities using real attacker techniques — low-impact and stealthy throughout.
Reporting & debrief
Plain-English report with prioritised risk ratings and clear remediation steps.
Fix validation
We confirm remediation was effective before closing the engagement.
In scope — what we test
- Firewalls, servers and network perimeter
- Public-facing web applications and portals
- Email gateways and mail server configuration
- VPN endpoints and remote access solutions
- Cloud services and externally accessible APIs
- SSL/TLS configuration and certificate validity
- Default credentials and banner leakage
- DNS configuration and subdomain exposure
Our accreditation
CREST & CHECK accredited testing
All penetration testing is conducted by our specialist cyber security partner, whose team holds CREST and CHECK accreditation — the recognised standard for penetration testing quality, rigour and regulatory alignment in the UK. Testing is low-impact, non-invasive and stealthy, providing detailed results without affecting your day-to-day operations.
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Why Techfident
Why businesses choose Techfident for penetration testing
Human-led, not automated
CREST-certified testers think like real attackers. Not scanners, not scripts — people who find what automation misses: chained vulnerabilities and logic flaws.
One contact for the relationship
Techfident manages your relationship and writes up your initial project brief, and our CREST & CHECK accredited partner carries out the testing. One named director stays your point of contact from scoping call to final report.
Fix validation included
We don’t walk away after the report. Configuration support and fix validation are included to confirm every identified gap is closed before the engagement ends.
Security beyond the test
Pen testing is the start, not the end. Quarterly vulnerability scanning, Cyber Essentials certification and full SOC services are available as your needs grow.
FAQ
Common questions
An external penetration test simulates a real-world cyberattack on your public-facing infrastructure — websites, email gateways, VPNs, firewalls, and cloud services — using the same techniques a real attacker would use. Unlike automated vulnerability scans, penetration testing is human-led and involves actively attempting to exploit weaknesses to understand their real-world impact, including how vulnerabilities can be chained together.
Vulnerability scanning is automated and identifies known weaknesses across your systems — it tells you what is potentially exposed. Penetration testing is human-led and goes further: testers actively attempt to exploit those weaknesses, chain vulnerabilities together, and demonstrate the real-world impact. Scanning is broader and runs continuously; pen testing goes deeper and is typically conducted annually or after significant infrastructure changes.
The duration depends on the scope — specifically the number of IP addresses, domains, and applications in scope. Most external infrastructure penetration tests complete within 3 to 10 days of active testing, with the reporting and debrief stage following shortly after. Engagements begin with a scoping call to agree targets, rules of engagement, and timeline before testing starts.
No. All testing is designed to be low-impact, non-invasive, and stealthy. Our CREST-certified testers use controlled techniques calibrated to identify vulnerabilities without triggering outages, alerting customers, or affecting day-to-day operations. The test is conducted remotely against your external systems — there is no requirement for engineers on-site.
All penetration testing is conducted by our specialist cyber security partner, whose team holds CREST and CHECK accreditation — the recognised standard for penetration testing quality and regulatory alignment in the UK. They are in the top 1% of UK cyber security providers for accreditations and certifications, and have tested and secured over a thousand organisations.
External penetration testing is priced from an RRP of £1,350 per day. Each project is discussed individually, so your final price may differ. The number of days depends on the number of IP addresses in scope, the complexity of exposed services and the depth of testing required. Techfident provides a fixed-price quote before any engagement begins based on a scoping call — there are no unexpected day-rate overruns. Contact us for a no-obligation scoping conversation.
You receive a written report detailing every vulnerability identified, its severity rating (critical, high, medium, low), a clear explanation of the potential impact, and specific remediation guidance for each finding. Techfident also provides a plain-English executive summary suitable for board-level review. A re-test to verify remediation has been completed is available as part of the engagement.
Annual external penetration testing is the widely accepted baseline for most SMEs. Businesses that deploy significant infrastructure changes, acquire new companies, or operate in regulated industries should test more frequently — typically every six months. Cyber Essentials Plus also requires periodic penetration testing as part of the certification process.
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External Penetration Testing — UK Businesses
Find your vulnerabilities before attackers do.
Start with a no-pressure scoping call. We’ll discuss your infrastructure, agree on targets, and provide a fixed-cost proposal — no hidden fees.