CISO Tribune

Vendor comparison · 2 companies

Intruder vs UnderDefense

Intruder sells a single platform for continuous scanning across infrastructure, apps and cloud environments. UnderDefense sells UnderDefense MAXI, a security and compliance automation platform, and an MDR service in which security experts monitor, detect and respond to incidents. CISO Tribune files both under Penetration testing and red team services. This page sets the two records side by side: what each sells, where it is based, who owns and funds it, the customers it names and its recent news, each fact numbered to its source.

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  • Intruder
  • UnderDefense
Intruder vs UnderDefense: Products, Customers and Funding Compared
IntruderIntruder sells a single platform for continuous scanning across infrastructure, apps and cloud environments.intruder.ioUnderDefenseUnderDefense sells UnderDefense MAXI, a security and compliance automation platform, and an MDR service in which security experts monitor, detect and respond to incidents.underdefense.com
What it sells
  • Attack Surface Management[1][8]Finds assets outside an inventory and shows monitored ports and services.
  • Application Security[3]Continuous dynamic application security testing for web apps and single-page apps.
  • Cloud Security[1][3][9]Agentless scanning across AWS, Azure and Google Cloud.
  • UnderDefense MAXI[1][2][3][5][6]A security and compliance automation platform. UnderDefense MAXI integrates with SIEMs, firewalls and endpoint protection solutions.
  • UnderDefense Agentic AI SOC[4]AI agents investigate each alert. Analysts on shift 24/7 decide what happens next.
  • MDR[1][2][6]Security experts monitor, detect and respond to incidents.
  • Cloud-based SIEM[2]A cloud-based SIEM that collects, analyzes and responds to security events.
  • CIS AWS Benchmark assessment[8]A self-service assessment of AWS security.
Categories
Headquarters
London, United Kingdom[2]Not stated on its pages
Founded
2015[2][4]Not stated on its pages
Ownership and funding
Not stated on its pagesNot stated on its pages
Named customers
Not stated on its pagesNot stated on its pages
Recent news
Not stated on its pagesNot stated on its pages
G2 and Gartner Peer Insights
  • G2: listed, seen November 12, 2026[13]
  • Gartner Peer Insights: Not stated on its pages
  • G2: listed, seen November 10, 2026[10]
  • Gartner Peer Insights: Not stated on its pages
Who it fits
Not written yetUnderDefense MAXI integrates with a customer's security infrastructure, including SIEMs, firewalls and endpoint protection solutions. UnderDefense offers compliance templates to organizations working toward standards such as SOC2 and ISO 27001. UnderDefense MAXI provides executive-level reports for C-level readers.
Last verified
November 12, 2026October 26, 2026

Where they overlap

  • Intruder and UnderDefense are both filed under Penetration testing and red team services.

Where they differ, field by field

  • Intruder's primary category is Vulnerability management; UnderDefense's is MDR and managed SOC.
  • Intruder is also filed under External attack surface management and Cloud security posture management. UnderDefense is also filed under Compliance automation and SOAR and security automation.
  • Intruder lists Attack Surface Management, Application Security and Cloud Security. UnderDefense lists UnderDefense MAXI, UnderDefense Agentic AI SOC, MDR, Cloud-based SIEM and CIS AWS Benchmark assessment.
  • Intruder is headquartered in London, United Kingdom.
  • Intruder was founded in 2015.

What it sells: Intruder

What Attack Surface Management does[1][8]
It connects to AWS, Azure, Google Cloud, and Cloudflare accounts and takes any domains and IPs. The attack surface view shows every monitored port, the service running on it, and the version behind it.
What Application Security does[3]
Application Security provides continuous dynamic application security testing (DAST) for web apps, single-page apps and underlying infrastructure, including authenticated scanning behind login pages. A ZAP-powered scanner runs over 75 application checks and integrates with CI/CD pipelines through GitHub, GitLab, Jira and Azure DevOps.
What Cloud Security does[1][3][9]
Cloud Security runs agentless scanning across AWS, Azure and Google Cloud for misconfigurations, insecure permissions, exposed secrets and critical vulnerabilities. CSPM checks run daily and trigger when the environment changes. Intruder scans container images at the registry level.

What it sells: UnderDefense

What UnderDefense MAXI does[1][2][3][5][6]
UnderDefense MAXI natively monitors endpoints, networks, users and decoy beacons. UnderDefense MAXI provides ready-to-use playbooks, AI-powered alert enrichment and notifications through Slack, Jira or a preferred tool. UnderDefense MAXI provides pre-built compliance templates for standards such as SOC2 and ISO 27001.
What UnderDefense Agentic AI SOC does[4]
UnderDefense Agentic AI SOC uses AI agents that investigate each alert. Analysts on shift 24/7 decide what happens next.
What CIS AWS Benchmark assessment does[8]
UnderDefense offers a self-service CIS AWS Benchmark assessment. The assessment covers evaluating the maturity of cloud security controls, identifying misconfigurations, providing detailed mitigation instructions and giving a summary table with a final CVSS v3.0 score.

Questions about Intruder and UnderDefense

What do Intruder and UnderDefense sell?
Intruder sells Attack Surface Management, Application Security and Cloud Security. UnderDefense sells UnderDefense MAXI, UnderDefense Agentic AI SOC, MDR, Cloud-based SIEM and CIS AWS Benchmark assessment.
Are Intruder and UnderDefense in the same category?
They share Penetration testing and red team services. Intruder's primary category is Vulnerability management and UnderDefense's is MDR and managed SOC.
Where are Intruder and UnderDefense headquartered?
Intruder is headquartered in London, United Kingdom.
When were Intruder and UnderDefense founded?
Intruder was founded in 2015.
Who are Intruder and UnderDefense sold to?
UnderDefense MAXI integrates with a customer's security infrastructure, including SIEMs, firewalls and endpoint protection solutions.

About Intruder

Intruder sells a single platform for continuous scanning across infrastructure, apps and cloud environments. Intruder was founded in 2015 by Chris Wallis to help solve the information overload crisis in vulnerability management. Intruder Systems Ltd completed the AICPA Service Organization Control (SOC) 2 Type 2 audit. The Intruder portal runs as a SaaS environment with logical data separation between clients' datasets.[5]

Intruder runs emerging threat scans within hours of new critical vulnerabilities going public. Intruder checks systems for 170,000+ infrastructure weaknesses, 75+ web-layer security issues and other misconfigurations. Intruder emerging threat scans check systems for newly discovered vulnerabilities automatically, as soon as a check is available. Intruder is powered by scanners including Tenable, Nuclei, OpenVas, and ZAP. Intruder offers internal target scanning only on the Pro and Enterprise plans.[6][7]

Intruder describes attack surface management as the continuous process of discovering, assessing, and reducing every digital asset an attacker can reach, including systems that are unknown or unmanaged. Port scans run daily in Intruder to track what is exposed. New service scans trigger in Intruder when something in the environment changes, and emerging threat scans run when a major new vulnerability is disclosed. The Intruder attack surface view shows every monitored port, the service running on it, and the version behind it, with a screenshot of each web service. Users of the Intruder attack surface view can search or filter by port, service, product, host status, or certificate expiry.[1][8]

Intruder cloud security needs no agents and connects to AWS, Azure, and Google Cloud accounts. Intruder connects to cloud accounts using read-only access, and nothing is deployed into the infrastructure. Intruder scans container images at the registry level. Intruder shows cloud misconfigurations, exposed secrets, insecure permissions, CVEs, and attack surface issues in one place.[8][9]

A ZAP-powered scanner in Intruder runs over 75 application checks for injection flaws, misconfigurations and zero-days. The same Intruder scanner integrates with CI/CD pipelines through GitHub, GitLab, Jira and Azure DevOps, and prioritizes results with remediation advice.

Intruder takes a white-box approach, working from source code. Intruder's agents are built and trained by CREST-certified pentesters and validate every finding against the application. Intruder delivers AI pentest results in a report containing an executive summary, full technical details, and remediation guidance. Intruder formats the AI pentest report to serve as compliance evidence for frameworks like SOC 2, ISO 27001, PCI DSS, and Cyber Essentials. Intruder also connects to a Bitbucket code repo to run a pentest on demand.[10][11]

Intruder integrates with Jira, GitHub, GitLab, Azure DevOps, and ServiceNow for issue tracking, Slack and Microsoft Teams for alerts, Drata and Vanta for compliance, and Microsoft Sentinel for SIEM. Intruder syncs container images from Docker Hub accounts for scanning. Intruder syncs targets from a Cloudflare environment and scans them for vulnerabilities. Intruder supports Okta SSO for authenticating users. Intruder prices the Cloud and Pro plans as a base fee plus a fee-per-target. Intruder quotes Enterprise pricing separately, because it depends on requirements and the size and complexity of the customer's systems. Customers can choose either a monthly rolling plan, which can be cancelled at any time, or an annual plan.[7][9][11]

Ravelin uses Intruder for continuous vulnerability scanning of its payment systems. Brainlabs relies on Intruder to find unknowns as new acquisitions reshape its attack surface. Hill & Smith uses Intruder to uncover hidden assets and expand visibility of its attack surface. Litmus uses Intruder to automate security and protect customer data. Surveil partnered with Intruder to gain attack surface visibility.[1][7][8][9][10]

Intruder on the record

Sources

Intruder full record

  1. [1]intruder.ioIntruder · intruder.io · undated page, accessed November 12, 2026 · Tier A
  2. [2]CareersIntruder · intruder.io · undated page, accessed November 12, 2026 · Tier A
  3. [3]Intruder | Stop Breaches Before They StartIntruder · undated page, accessed November 12, 2026 · Tier A
  4. [4]Intruder About Us | Providing Effortless Cyber SecurityIntruder · undated page, accessed November 12, 2026 · Tier A
  5. [5]Intruder Security | How We Keep Your Data SecureIntruder · undated page, accessed November 12, 2026 · Tier A
  6. [6]Solution TemplateIntruder · undated page, accessed November 12, 2026 · Tier A
  7. [7]Intruder Pricing | Plans & Bolt-onsIntruder · undated page, accessed November 12, 2026 · Tier A
  8. [8]Attack Surface Management for Shadow IT and Exposures | IntruderIntruder · undated page, accessed November 12, 2026 · Tier A
  9. [9]Cloud Security for AWS, Azure and Google Cloud in One View | IntruderIntruder · undated page, accessed November 12, 2026 · Tier A
  10. [10]AI Pentesting: On-Demand Web App Pentests in Hours | IntruderIntruder · undated page, accessed November 12, 2026 · Tier A
  11. [11]Integrations | Jira, Slack, Vanta, AWS & MoreIntruder · undated page, accessed November 12, 2026 · Tier A
  12. [12]Customer Success Stories | IntruderIntruder · undated page, accessed November 12, 2026 · Tier A
  13. [13]Intruder Reviews 2026: Details, Pricing, & FeaturesG2 · undated page, accessed November 12, 2026 · Tier C

UnderDefense full record

  1. [1]underdefense.comUnderDefense · underdefense.com · undated page, accessed October 26, 2026 · Tier A
  2. [2]Compliance PricingUnderDefense · undated page, accessed November 10, 2026 · Tier A
  3. [3]Agentic AI SOC & Compliance Automation Platform | UnderDefenseUnderDefense · undated page, accessed November 10, 2026 · Tier A
  4. [4]Elastic Cloud Pricing 2026: Serverless, Hosted, and SIEMUnderDefense · undated page, accessed November 10, 2026 · Tier A
  5. [5]Cloudflare Pricing 2026: WAF, Zero Trust, and EnterpriseUnderDefense · undated page, accessed November 10, 2026 · Tier A
  6. [6]Palo Alto Networks Pricing 2026: Firewalls, SASE, and XDRUnderDefense · undated page, accessed November 10, 2026 · Tier A
  7. [7]2025 MXDR Pricing Guide: Choosing the Right MXDR providerUnderDefense · undated page, accessed November 10, 2026 · Tier A
  8. [8]Episode 4: Cyber Resilience 201 — AWS Cloud Security - UnderDefenseUnderDefense · undated page, accessed November 10, 2026 · Tier A
  9. [9]E-Mail Under Attack - UnderDefenseUnderDefense · undated page, accessed November 10, 2026 · Tier A
  10. [10]UnderDefense MAXI Reviews & Product DetailsG2 · undated page, accessed November 10, 2026 · Tier C

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