Lion Cipher Lab
Find vulnerabilities fast with Nuclei
- Penetration Testing / Red Team
- Intermediate
- ~45 min
- Free · no account required
Why it matters
Most breaches still start with a known, already-patched vulnerability or a sloppy misconfiguration — not a genius zero-day. Nuclei is the tool the industry reaches for to sweep for exactly those, fast, across one host or ten thousand, using a shared library of ~10,000 community-written checks. Learning it means you can answer 'is this target exposed to anything already known?' in minutes. Just as important, this lab teaches you the tool's edges: Nuclei finds known and templated problems brilliantly and finds logic and access-control bugs not at all — knowing that difference is what separates…
What you'll learn
- template-based vulnerability scanning with Nuclei
- understanding the community nuclei-templates model (severity, tags, CVEs)
- triaging findings: real vulnerability vs false positive
- filtering a scan by severity and tags to cut noise
- writing a minimal custom Nuclei template
- judgment: when Nuclei is the right tool and when it is not
- authorized-testing discipline (own targets only)
Steps in this lab
- What Nuclei is, and the template idea in one breath
- WHEN Nuclei is the right tool — and when it absolutely isn't
- Ethics first: you may only scan a target you own
- Spin up your own vulnerable target (OWASP Juice Shop)
- Run Nuclei against it for the first time
- Read the output — and triage real vs noise
- Do it better: filter by severity and tags instead of drowning
- Write your own tiny template — the model from the inside
- Clean up, and what you actually learned