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Interview question · Systems, OS & Memory Safety

How do software vulnerabilities actually arise? Give a root-cause taxonomy and explain how each class is found and prevented.

A vulnerability is a gap between what the code assumes and what an attacker can make true. Nearly every one falls into a handful of root causes, and each has a matching way to find and prevent it.

easyEssentialNewPreparation tags: Google, Microsoft, AmazonUpdated Nov 2026

A vulnerability is a gap between what the code assumes and what an attacker can make true. Nearly every one falls into a handful of root causes, and each has a matching way to find and prevent it.

Make your first attempt

What would you say before reading the answer?

  1. 01 State the assumptions your answer depends on.
  2. 02 Explain the mechanism and choose a control.
  3. 03 Name a condition that would change your decision.

The worked answer includes an approach, scoring criteria and follow-up questions. Compare the reasoning with your own.

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What if · the follow-ups in this answer

The answer works through 6 follow-ups like an interviewer would

Your team fixed a SQL injection in one endpoint after a bug bounty report, and a manager asks how to stop the next one.

  1. What root causes produce most vulnerabilities?
  2. Why is fixing one endpoint not enough?
  3. How do you eliminate the class?
  4. How do you verify the class is gone?
  5. How do you use bug reports strategically?
  6. How would you answer the manager?

Each rung has a nudge, a model answer, the principle that carries over and the weak answer to avoid. Premium opens every answer and ladder.

UP NEXT ON YOUR JOURNEY
Next in this trackConceptually, how does a memory-safety bug become reliable code execution, and which modern mitigations break each step of that path?Next in this trackHow do kernel vulnerabilities turn into local privilege escalation, and what limits them on Linux, Windows and mobile?Next in this trackHow does Windows run services and hold credentials in LSASS, and why are services and LSASS central to both attack and defence?
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