Vulnerability Assessment Providers
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.
Aardwolf Security
Boutique UK penetration testing consultancy in Milton Keynes specialising in manual, expert-led security assessments across web applications, APIs, cloud, and mobile platforms.
Aon Cyber Solutions
Cybersecurity consulting division of global insurance leader Aon, uniquely combining penetration testing with cyber risk quantification and insurance expertise.
Aristi
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.
Black Hills Information Security
Community-driven penetration testing firm known for free security education, open-source tools, Wild West Hackin' Fest, and practical offensive security services.
BreachLock
Cloud-based Penetration Testing as a Service platform combining AI-driven automation with expert manual testing at accessible price points.
Bridewell
Fast-growing CREST and CHECK-accredited UK cybersecurity consultancy with deep expertise in critical national infrastructure sectors.
Bugcrowd
Leading crowdsourced security platform offering managed bug bounty programs and crowd-powered penetration testing with hundreds of thousands of ethical hackers.
Bulletproof
CREST-accredited UK cybersecurity and compliance provider offering penetration testing, managed security services, and regulatory consultancy to over 2,000 customers from its Stevenage headquarters.
Claranet
CREST and CHECK-accredited European managed services provider delivering penetration testing with deep infrastructure and cloud hosting expertise.
Coalfire
Compliance-focused cybersecurity advisory firm and FedRAMP 3PAO specializing in penetration testing that meets stringent regulatory requirements.
CovertSwarm
Subscription-based offensive cybersecurity firm delivering continuous cyber attack services with CREST STAR and CBEST accreditations from its London headquarters.
CrowdStrike
Global cybersecurity leader leveraging world-class threat intelligence from the Falcon platform to deliver intelligence-led penetration testing and red teaming.
Cyberis
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.
CyberLab
Cardiff-based CREST and CHECK-accredited cyber security company delivering penetration testing, red teaming, and OT security assessments as part of the Chess Group.
Cyphere
CREST-accredited Manchester-based cyber security firm delivering penetration testing, managed security services, and compliance consultancy across the UK, Europe, and the USA.
Dionach
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.
DTS Solution
Dubai-based cybersecurity firm providing pen testing and security consulting across the GCC with expertise in critical infrastructure.
Equilibrium Security
CREST-accredited Birmingham-based cyber security consultancy delivering penetration testing, social engineering assessments, and Cyber Essentials certification for public and private sector clients.
Evalian
CREST-accredited UK cyber security and data protection consultancy offering penetration testing, ISO consultancy, and managed SOC services from offices across the UK and Ireland.
HackerOne
World's largest ethical hacker platform with over one million researchers, offering bug bounties and structured penetration testing to the US DoD and Fortune 500.
Integrity360
CREST-accredited pan-European cybersecurity services provider delivering penetration testing and managed security from Dublin with a strong UK and Ireland presence.
IT Governance
Established Ely-based compliance and cybersecurity consultancy offering CREST-approved penetration testing as part of a comprehensive governance, risk management, and compliance portfolio.
JUMPSEC
Full-service London-based cybersecurity consultancy with CREST, CHECK, and NCSC accreditations delivering offensive testing, managed detection, and strategic advisory services.
Kolibërs Group
Mexico-based cybersecurity firm delivering pen testing services across Latin America with international standards alignment.
LRQA
The only organisation worldwide with a full suite of CREST accreditations. 250+ cybersecurity specialists operating in 55+ countries across pen testing, red teaming, and incident response.
MDSec
Elite UK offensive security consultancy specialising in CBEST/STAR/TIBER red teaming, advanced adversary simulation, and CREST-accredited penetration testing for FTSE 100 clients.
NCC Group
Global cybersecurity consultancy with CREST, CHECK, and CBEST accreditation, renowned for deep technical research and comprehensive penetration testing services.
Netragard
Top 10-ranked US pen testing firm with proprietary Real Time Dynamic Testing methodology. Three-tier service model from standard to maximum-depth custom testing.
NetSPI
Leading penetration testing firm with the Resolve platform for continuous attack surface management, trusted by nine of the top ten US banks.
OnSecurity
CREST-accredited, platform-driven penetration testing vendor in Bristol offering AI-augmented testing with rapid self-service booking for over 400 global customers.
Pen Test Partners
The UK's largest independent security testing firm, renowned for IoT/OT research, CBEST red teaming, and CHECK/CREST-accredited penetration testing across all sectors.
Penetration Testing ME
Dubai-based CREST and ISO certified pen testing specialist serving the GCC region with full VAPT services.
Pentest People
CREST and CHECK-accredited UK penetration testing firm with an innovative SecurePortal platform and transparent pricing for mid-market organizations.
PwC Cyber Security
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.
Rapid7
Creators of Metasploit offering enterprise penetration testing integrated with their comprehensive vulnerability management and security operations platform.
Raxis
Gartner-recognised PTaaS provider with 14+ years of experience. Expert-led pen testing combining manual techniques with AI-powered tooling across web, cloud, mobile, and SCADA/ICS.
Redbot Security
Denver-based boutique pen testing firm with senior-only testers. Personalised engagements across penetration testing, red teaming, and vulnerability management.
Redpoint Cybersecurity
US-wide pen testing firm serving major cities including Atlanta, Dallas, Denver, Houston, and Miami with comprehensive security assessments.
Redscan (A Kroll Business)
London-based cybersecurity provider, now part of Kroll, delivering CREST-accredited penetration testing, managed detection and response, and incident response with a 550-strong cyber team.
RedSecLabs
CREST-certified and PCI QSA penetration testing consultancy in London, delivering offensive security and compliance services across 25+ countries with research-driven expertise.
Redspin
Miami-based cybersecurity firm with 300+ employees and deep healthcare/HIPAA expertise. Delivering pen testing since 2000.
RedTeam Security
Atlanta-based pen testing firm serving major enterprises. Known for physical penetration testing alongside network and application assessments.
Salus Cyber
Award-winning Cheltenham-based cybersecurity consultancy with NCSC CHECK Green Light status and CREST approval, specialising in defence, government, and critical national infrastructure security.
SEC Consult
Leading European cybersecurity consultancy from Vienna with a prolific vulnerability research program and deep expertise in IoT and embedded systems security.
Secarma
Manchester-based independent cybersecurity consultancy with over 20 years of experience delivering CREST and CHECK-accredited penetration testing, red teaming, and compliance certification services.
SECFORCE
Leading UK offensive security consultancy based in Canary Wharf, delivering CREST-accredited penetration testing and adversary simulation to organisations with the most demanding security requirements.
Secureworks
Dell Technologies-backed cybersecurity firm with elite Counter Threat Unit intelligence informing enterprise penetration testing and adversary simulation.
Securin
Vulnerability intelligence-driven penetration testing firm providing contextual security assessments informed by threat actor exploitation data and ransomware tracking.
Sencode
CREST-accredited North East England penetration testing specialist founded in 2019, offering accessible and transparent security testing with free retests and a strong focus on social engineering.
Stripe OLT
Award-winning CREST-certified managed cyber security and IT support provider with offices in Bristol, London, and Manchester, specialising in penetration testing and Microsoft security technologies.
Swascan
Italian cloud-based security testing firm offering black, white, and grey box pen testing with strong European compliance expertise.
Synack
FedRAMP-authorized crowdsourced penetration testing platform combining vetted elite hackers with AI-powered Hydra technology for continuous security testing.
Telspace Africa
Johannesburg-based infosec consultancy operating since 2002. One of Africa's oldest pen testing firms with deep technical expertise.
Tevora
CREST-accredited California consultancy blending compliance expertise with penetration testing. First to earn ISO 17020 for MITRE ATT&CK and PTES frameworks.
ThreatSpike Red
London-based cybersecurity firm offering unlimited, fixed-price penetration testing and red teaming services with ISO 27001 certification and a unique subscription model.
TrustedSec
Elite offensive security firm founded by a former NSA operator, delivering CREST-accredited penetration testing, red teaming, and adversary simulation to Fortune 500 and government clients.
Trustwave
Global managed security provider with the elite SpiderLabs penetration testing team and deep PCI DSS compliance expertise.
Vumetric (TELUS)
ISO 9001-certified Canadian pen testing firm conducting 500+ tests annually. Now part of TELUS, serving Fortune 1000 to SMBs.
WithSecure
Leading European cybersecurity firm offering penetration testing with deep expertise in EU regulatory compliance including GDPR, NIS 2, and TIBER-EU.
Vulnerability Assessment FAQs
What is the difference between vulnerability assessment and penetration testing?+
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.
How often should vulnerability assessments be performed?+
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).
Can vulnerability assessments replace penetration testing?+
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.