Threat Modeling

Find the flaws while they are still cheap — on the whiteboard, before they ship to production.

Request a scoping call Our methodology
Why this matters: Most serious vulnerabilities are decided at design time and discovered in production — the most expensive possible place to meet them. Threat modeling reverses that: we attack the design on a whiteboard, where a trust boundary drawn in the wrong place costs a marker stroke instead of a breach. Every Hmmnm assessment already starts with an attack-surface map; this service delivers that discipline standalone.

What we cover

  • Application and infrastructure threat-modeling workshops
  • Attack-surface and trust-boundary mapping (data-flow diagrams)
  • STRIDE analysis per element and attack trees on crown jewels
  • AI and agent threat modeling — new trust boundaries, new abuse cases
  • Cloud, CI/CD, and supply-chain pipeline threat models
  • Prioritized mitigations with risk and effort context

How we test

1Diagram

We map the system: components, data flows, and — most importantly — where trust changes hands. The diagram alone regularly reveals flaws.

2Identify threats

Structured analysis against each element (STRIDE) plus attack trees on the assets that matter most.

3Mitigate & prioritize

Findings ranked by risk and implementation effort — so the roadmap is obvious, not aspirational.

4Embed

The model stays a living document, reviewed at design time for every significant change. Your team learns to run the next one.

What you get

  • A living threat-model document with diagrams
  • Trust-boundary map of your system
  • Prioritized, effort-aware mitigation backlog
  • A workshop so your team can repeat the process

The engagement at a glance

📞 Free scoping call

A short conversation about your environment. You receive a written scope, timeline, and fixed quote — no obligation.

✍️ Signed authorization

Testing begins only with your written permission and agreed rules of engagement. Always.

⏱️ Time-boxed delivery

A calendar agreed before we start, with an agreed communication plan while testing runs.

🔁 Retest included

A verification pass over everything you fix — included in the price, not an add-on.

See the full engagement process → and how pricing is scoped in our public pricing guide.

Related research from Hmmnm

AI Agent Security — attack surfaces and trust boundarieshmmnm.com Web App Pentesting — the complete guidehmmnm.com Zero-trust architecture: an implementation guidehmmnm.com Foundations: dependencies, builds, and secretshmmnm.com

Common questions

When should we threat model?

Ideally at design time — new system, new feature, or major change, when fixes cost a marker stroke. Retroactive modeling of a running system is also valuable and often reveals inherited assumptions nobody remembers justifying.

Which methodology do you use?

A pragmatic mix: data-flow diagrams with explicit trust boundaries, STRIDE per element, and attack trees for crown jewels. For AI systems we add agent-specific abuse cases mapped to MITRE ATLAS and the OWASP Agentic AI Top 10.

Is this a one-time exercise?

The model is per system, but the value compounds when it is kept alive — reviewed at each significant design change. We set it up so your team can run those refreshes themselves.

Do you need access to our code?

No — architecture diagrams, design documents, and a working session with your engineers are enough. Code access deepens it, but the method works at design level.

Authorization first, always. Testing happens only with your written permission and agreed rules of engagement — the same ethics that govern responsible disclosure on this site.
Explore other services 🌐 Web Application Penetration Testing 🤖 AI & LLM Security Assessment ☁️ Cloud & Identity Security Review 🔗 Software Supply Chain Security Assessment 📡 Threat Intelligence & Detection Review 🎓 Security Training & Workshops 🖥️ Network Penetration Testing 📱 Mobile App Security Testing 🎯 Red Team Simulation 🤝 Purple Team Exercise 🎣 Phishing Simulation 🔍 Attack Surface Review 🕵️ Breach Exposure Check 🚨 Compromise Check 🚑 Incident Response Support 🛟 Ransomware Readiness Check 👔 Virtual CISO 📊 Security Maturity Check 🔑 Password Strength Audit 📋 Compliance Readiness 🧬 API Security Testing 🧾 Source Code Review 🧱 Zero Trust Assessment 🏬 Third-Party Risk Assessment 🐞 Bug Bounty Support 🔬 Security Research Services 🎤 Campus & Corporate Seminars 🌱 Security Internship Program

Want this assessed for your environment?

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