Vulnerability assessment is a systematic process of identifying, quantifying, and prioritising security vulnerabilities across an organisation's IT infrastructure, applications, and networks. Unlike penetration testing, which involves active exploitation, vulnerability assessments focus on identifying and cataloguing known vulnerabilities using automated scanning tools combined with manual verification to reduce false positives.
Assessments cover operating systems, network devices, web applications, databases, and cloud resources, producing a prioritised list of vulnerabilities rated by severity, exploitability, and business impact. Vulnerability assessments provide broad coverage across the attack surface and are an efficient way to identify low-hanging fruit and maintain ongoing visibility into security posture.
Many organisations use vulnerability assessments as a complement to penetration testing, running regular assessments (monthly or quarterly) between annual pen tests. Vulnerability assessments are required by compliance frameworks including PCI DSS (quarterly scans), ISO 27001, SOC 2, HIPAA, and Cyber Essentials. Managed vulnerability assessment services provide continuous monitoring and reporting, helping organisations maintain compliance and respond quickly to newly disclosed vulnerabilities.
UK offensive security consultancy delivering CREST-accredited penetration testing, adversary simulation and CBEST, TIBER-EU and TBEST threat-led testing, mainly for financial services and other large organisations.
Penetration testing firm trusted by nine of the top ten US banks, with the Resolve platform for continuous attack surface management.
Global enterprise cybersecurity consultancy founded in 1999 in Oxford, holding rare CREST STAR-FS accreditation and delivering penetration testing, red and purple teaming, and PCI QSA services across five international offices.
Global Big Four professional services firm delivering CREST, CHECK, and CBEST-accredited penetration testing and red teaming services from London, serving the UK's largest enterprises and regulated organisations.
CREST and CHECK-accredited UK penetration testing and managed security provider formed in 2026 from Pentest People, Bulletproof, and Target Defense, with CREST STAR/TLPT-FS capability and the GuardNest vulnerability management platform.
Munich- and Budapest-based embedded cybersecurity experts focused on financial services, automotive and mobility, manufacturing and industrial automation, energy and more. The services and platform go beyond compliance, supporting the requirements of the Cyber Resilience Act, PCI PTS, UN R155, ISO/SAE 21434 and other standards and regulations.
US penetration testing firm founded in 2011, running 600+ engagements a year with a fully remote, US-based team. Manual, expert-led testing across web, network, cloud, mobile, wireless, OT/ICS, and AI/LLM. Gartner Sample Vendor for PTaaS.
Elite UK offensive security consultancy specialising in CBEST/STAR/TIBER red teaming, advanced adversary simulation, and CREST-accredited penetration testing for FTSE 100 clients.
Full-service London-based cybersecurity consultancy with CREST, CHECK, and NCSC accreditations delivering offensive testing, managed detection, and strategic advisory services.
Global managed security provider with the elite SpiderLabs penetration testing team and deep PCI DSS compliance expertise.
Manchester-based independent cybersecurity consultancy with over 20 years of experience delivering CREST and CHECK-accredited penetration testing, red teaming, and compliance certification services.
CREST and CHECK-accredited UK penetration testing consultancy with CBEST approval, specialising in infrastructure, application, and simulated attack assessments across the public and private sectors.
Vulnerability assessment identifies and catalogues vulnerabilities using automated tools. Penetration testing goes further by actively exploiting vulnerabilities to demonstrate real-world impact and test defences.
Best practice is monthly or quarterly scanning, with continuous monitoring for critical assets. PCI DSS requires quarterly vulnerability scans by an Approved Scanning Vendor (ASV).
No, they serve different purposes. Vulnerability assessments provide broad coverage of known issues. Penetration testing discovers complex vulnerabilities, business logic flaws, and chained attacks that scanners miss.