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fuzz

Testing & quality

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Updated 10-15 17:17

About this skill

Fuzz — Web Fuzzing with ffuf

Lightweight web application fuzzing using ffuf.

Prerequisites

command -v ffuf && ffuf -V

If not installed:

brew install ffuf    # macOS
# or
go install github.com/ffuf/ffuf/v2@latest

Common Wordlists

/usr/share/wordlists/                          # Kali default
/opt/homebrew/share/wordlists/                 # Homebrew
~/.local/share/wordlists/                      # User-local

# SecLists (install: brew install seclists)
/opt/homebrew/share/seclists/Discovery/Web-Content/common.txt
/opt/homebrew/share/seclists/Discovery/Web-Content/directory-list-2.3-medium.txt
/opt/homebrew/share/seclists/Discovery/DNS/subdomains-top1million-5000.txt
/opt/homebrew/share/seclists/Fuzzing/LFI/LFI-Jhaddix.txt

If no wordlists found: brew install seclists

Usage Patterns

Directory / File Discovery

ffuf -u https://TARGET/FUZZ -w wordlist.txt -mc 200,301,302,403

API Endpoint Discovery

ffuf -u https://TARGET/api/FUZZ -w wordlist.txt -mc 200,401,403,405

Parameter Fuzzing (GET)

ffuf -u "https://TARGET/page?FUZZ=value" -w params.txt -mc 200 -fs 4242

POST Data Fuzzing

ffuf -u https://TARGET/login -X POST \
  -d "username=admin&password=FUZZ" \
  -w passwords.txt -mc 200 -fc 401

Subdomain Enumeration

ffuf -u https://FUZZ.TARGET.com -w subdomains.txt -mc 200,301,302

Authenticated Fuzzing

ffuf -u https://TARGET/api/FUZZ -w wordlist.txt \
  -H "Authorization: Bearer <token>" \
  -H "Cookie: session=<value>" \
  -mc 200,201,403

Filtering Options

  • -mc 200,301 — match HTTP status codes
  • -fc 404,500 — filter (exclude) status codes
  • -fs 4242 — filter by response size (removes noise)
  • -fw 12 — filter by word count
  • -fr "not found" — filter by regex in response

Output

ffuf -u https://TARGET/FUZZ -w wordlist.txt -o results.json -of json

Tips

  • Start with small wordlists, expand if needed
  • Use -rate 100 to limit requests per second (avoid DoS)
  • Use -t 40 to control thread count (default: 40)
  • Run once without filters, note the common response size, then add -fs
  • Combine with -recursion -recursion-depth 2 for recursive discovery