Penetration Testing in London
With cyber threats constantly evolving, London organisations require robust security testing that goes beyond automated scanning. Our crest certified penetration testers simulate real-world malicious attacks using the same techniques as attackers, ensuring weaknesses are identified before systems are compromised.
We provide expert penetration testing in London, helping organisations across the capital strengthen their cyber security, uncover security vulnerabilities and protect sensitive data from increasingly sophisticated cyber attacks. As a trusted penetration testing company, we deliver tailored penetration testing services designed for London-based organisations operating complex IT environments, critical infrastructure and high-value digital assets.
From web application and infrastructure penetration testing to physical penetration testing and red team assessments, our services help organisations understand their true security posture. Whether you are preparing for Cyber Essentials Plus, bidding for large commercial contracts, launching new infrastructure, or responding to emerging cyber threats, our testing provides independent assurance and actionable insights to reduce security risk.
What is Penetration Testing?
Penetration testing, also known as pen testing, is an offensive security assessment designed to identify weaknesses within computer systems, networks, web applications and mobile apps. It involves controlled attempts to gain access to target systems, exploit vulnerabilities and demonstrate the real-world impact of potential cyber attacks.
Our penetration testing process combines intelligence gathering, human intelligence, threat intelligence and technical expertise to uncover security flaws that automated tools often miss. This includes logic issues, access control failures, misconfigurations and security gaps that could otherwise lead to data breaches, compromised systems or business disruption.
During a security assessment, our penetration testers perform vulnerability analysis, exploit identified risks, and provide clear test results. This enables organisations to understand weaknesses identified, improve vulnerability management and strengthen their organisation’s security posture.
Schedule Consultation
Great service, could not be happier with the speedy response. Will recommend Zenzero to others looking for an outsourced IT provider. A+
Our penetration testing services in London
We deliver a comprehensive range of pen testing services across London, supporting organisations with complex IT infrastructure, regulatory requirements and future testing requirements.
Web Application Testing
Our web application penetration testing assesses web apps and web applications for security weaknesses such as injection flaws, authentication failures, insecure session handling and logic vulnerabilities. This protects sensitive data and prevents attackers from exploiting exposed systems.
Infrastructure Penetration Testing
Our infrastructure penetration testing services assess internal and external IT infrastructure, including servers, endpoints, cloud environments and networks. This includes external vulnerability scanning, internal testing and wireless assessments to identify vulnerabilities across critical assets.
Network & Vulnerability Testing
We combine vulnerability scanning, automated scanning and manual exploitation techniques to uncover vulnerabilities that put business operations at risk. Automated tools are enhanced with expert analysis to identify security weaknesses that would otherwise remain undetected.
Physical Penetration Testing
Our physical penetration testing evaluates real-world security controls, access points and human processes to assess the risk of unauthorised physical access leading to compromised systems or data loss.
Red Team Assessments
Our red team assessment services simulate advanced, targeted attacks using threat intelligence to test detection, response and resilience against sophisticated malicious attacks.
Compliance & Cyber Essentials Plus
We support organisations pursuing Cyber Essentials, Cyber Essentials Plus and other cyber scheme requirements. Our CREST pen testing services provide assurance for security standards bidding, regulatory requirements and acquisition preparing activities.
How Penetration Testing works
Our structured methodology ensures thorough and effective testing across all environments:
-
Scoping & planning – Define scope, systems, goals and security requirements
-
Intelligence gathering – Collect information on networks, applications and infrastructure
-
Testing & exploitation – Use automated tools and human-led techniques to exploit vulnerabilities
-
Analysis & reporting – Deliver clear test results, identified risks and remediation guidance
This approach helps organisations strengthen security posture, reduce security risk and prepare for future testing requirements.
Why your business needs penetration testing:
Identify vulnerabilities before attackers do
Penetration testing helps organisations identify vulnerabilities and security gaps before cyber criminals exploit them, reducing the likelihood of data breaches and service disruption.
Protect sensitive data & critical assets
By uncovering vulnerabilities and exploiting them safely, organisations gain clarity on how attackers could access sensitive data and compromise critical systems.
Meet compliance & regulatory requirements
Regular penetration tests support compliance with cyber security standards, industry regulations and contractual obligations, particularly for London organisations handling high-risk data.
Improve security posture with actionable insights
Our detailed reporting delivers practical remediation guidance, helping organisations address risks identified and improve their organisation’s security posture.
Choose Zenzero for Penetration Testing in London
Zenzero delivers trusted penetration testing services in London, combining deep technical expertise with practical cyber security insight. Our team of experienced cyber security professionals and CREST certified penetration testers provide independent assurance, helping organisations identify weaknesses, reduce risk and protect critical systems.
If your organisation needs reliable, expert-led penetration testing in London to defend against evolving cyber threats, strengthen security posture and safeguard sensitive data, speak to Zenzero today.
Our security certifications
*Coventry & London offices
Frequently Asked Questions
Which London organisations should commission penetration testing?
Any organisation relying on IT infrastructure, web apps or mobile apps can benefit. Penetration testing is particularly important for organisations handling sensitive data, operating under regulatory requirements or preparing for large commercial contracts.
What types of cyber threats can penetration testing help uncover?
Pen testing identifies risks linked to ransomware, phishing, unauthorised access, privilege escalation and other cyber attacks. It exposes security flaws that attackers could exploit to gain access to systems and disrupt business operations.
How does penetration testing differ from automated scanning?
While automated scanning identifies known vulnerabilities, penetration testing uses human intelligence to exploit vulnerabilities, test real attack paths and uncover weaknesses automated tools miss.
What is the pen test cost in London?
The pen test cost typically ranges from £2,000 to £20,000, depending on scope, systems tested and complexity. Zenzero provides tailored pen test quotes aligned with risk, infrastructure size and compliance needs.
How often should penetration testing be performed?
Regular penetration tests are recommended following significant changes, infrastructure launching, services undergoing updates, acquisitions, or emerging threats.