Intruder Systems Ltd

Intruder is a cybersecurity company headquartered in London, United Kingdom, specializing in vulnerability management and attack surface management. Founded in 2015 by Chris Wallis, its mission is to help organizations identify and prioritize critical security vulnerabilities, enabling them to focus on the most significant threats while reducing information overload.

The company offers a suite of security solutions including External, Internal, Cloud, Web App, and API Vulnerability Scanners, alongside Automated Penetration Testing and Attack Surface Management. Intruder's services also support compliance with standards such as SOC 2, ISO 27001, PCI DSS, and HIPAA, catering to a global customer base of over 3,000 organizations.

Under the leadership of CEO Chris Wallis, Intruder has achieved notable recognition, including being selected for GCHQ's Cyber Accelerator and being listed on Deloitte's Tech Fast 50 2023 as the fastest-growing cybersecurity company in the UK. In October 2025, it was awarded "External Attack Surface Management Platform of the Year" at the 9th annual CyberSecurity Breakthrough Awards. The company has grown to $13M ARR and 3000+ customers worldwide, notably without external venture capital funding.

Latest updates

Intruder Automates Pentesting with AI, Responds to Shrinking Exploit Windows

Event summary

  • Intruder launched 'AI Pentesting,' utilizing agents to investigate vulnerability scanner findings.
  • The initial release focuses on automating investigation of injection flaws, client-side attacks, and information disclosure vulnerabilities.
  • Intruder's 'Security Middle Child Report' found 49% of security leaders prioritize AI/automation and 42% of midmarket teams are stretched.
  • AI Pentesting aims to reduce investigation time from hours to minutes, addressing the shrinking 'exploit window' due to AI-powered attacks.
  • Free trial users and Intruder customers on Cloud, Pro, and Enterprise plans now have access to AI Pentesting credits.

The big picture

The rapid advancement of AI is fundamentally altering the cybersecurity landscape, forcing organizations to move beyond traditional, infrequent pentesting cycles. Intruder’s move to automate pentesting addresses a critical pain point for security teams struggling with increasing workloads and shrinking exploit windows, but also introduces new challenges around accuracy and scalability. This shift underscores the growing need for AI-powered solutions to augment human security expertise and proactively mitigate emerging threats.

What we're watching

Execution Risk
The success of AI Pentesting hinges on Intruder’s ability to scale agent capabilities beyond the initial release scope and maintain accuracy to avoid generating false positives, which could erode user trust.
Competitive Response
Other cybersecurity vendors will likely accelerate their own AI-driven pentesting offerings, potentially creating a price war or commoditization of the service.
Adoption Rate
The pace at which midmarket security teams, already stretched and resource-constrained, adopt AI Pentesting will determine Intruder’s revenue growth and market share gains.
CID: 2283