ISO/IEC 27001 Information Security Management · Global
ISO 27001 is the international standard for information security management systems (ISMS). It provides a systematic framework for managing sensitive company information and ensuring its confidentiality, integrity, and availability. Annex A control A.18.2.1 specifically requires independent review of information security, which includes penetration testing as a key validation activity.
Organisations seeking or maintaining ISO 27001 certification typically need annual penetration testing covering network infrastructure, web applications, and any systems processing sensitive data. The 2022 revision of the standard introduced new controls around threat intelligence and cloud security that further reinforce the need for regular security testing.
Penetration testing helps organisations demonstrate compliance with ISO 27001 by providing evidence of proactive security assessment and vulnerability management. Testing should cover the scope of the ISMS and be performed by qualified, independent testers.
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.
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.
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.
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.
CHECK and CREST-accredited Birmingham-based cyber security consultancy with over 15 years of experience delivering penetration testing, red teaming, and OT security assessments for government and private sector clients.
While not explicitly mandated, penetration testing is strongly recommended under Annex A controls A.8.8 (management of technical vulnerabilities) and A.18.2.1 (independent review of information security). Most certification auditors expect to see evidence of regular pen testing.
Annual penetration testing is the standard expectation, with additional testing after significant changes to systems within the ISMS scope.
Testing should cover systems and networks within the ISMS scope, including infrastructure, applications, and any systems that process, store, or transmit information covered by the ISMS.