NO REAL NETWORKING · NOTHING LEAVES THIS APP

Practice real hacking methodology.
Zero real risk.

A fictional hacking lab that runs entirely in your browser and on this server -- the terminal, the network, the "vulnerable" hosts, the exploits, the passwords are all fake and self-contained. Pick a difficulty, get a freshly generated target, work it start to finish, get root.

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Free forever: Easy tier + the weekly rotating challenge. No credit card to start.
See it in action

Watch a box get rooted, start to finish

The teaser (0:22) -- real commands, real techniques, a terminal and a target.
Full walkthrough (2:53) -- recon, a hidden path, a cracked hash, a second user, and root. Recorded on a Hard-tier box (VulnBox Pro); the Easy tier is free.
Leaderboard

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What this is

A real client/server hacking game, not a puzzle

Mission Boxes

Random Easy, Medium, Hard, and Hard -- Chained (a two-machine pivot scenario). Every target is procedurally generated on the spot -- same seed always rebuilds the same box. Fastest clean runs post to a public leaderboard.

Server-Authoritative

The bash interpreter, filesystem, and every exploit check run server-side. The browser is just a terminal UI -- nothing the client sends is ever trusted as the source of truth for what actually happened.

Learn As You Go

A 4-part guided tutorial walks you through different real techniques step by step -- brute-forcing a login, finding a hidden admin panel, running a real exploit, two distinct privilege-escalation tricks. A plain-language LESSONS tab explains what every tool does and why, no jargon, anytime you want a refresher.

Weekly Challenge

One shared target, identical for every player until the weekly reset -- free, and separate from the random-seed boxes.

How a box works

Every mission is the same real playbook

1
Recon. nmap -sV the target to see what's actually running before touching anything.
2
Foothold. Weak/default creds via hydra, or a hidden path via dirbuster leaking something to crack offline.
3
Enumerate. Find a second user's credential somewhere realistic -- a world-readable hash, a .bash_history slip-up, a leftover config file.
4
Privilege escalation. A real local technique -- a SUID-root binary, a sudo misconfiguration, or a scheduled-job abuse.
5
Capture 3 flags per box, simply by cat-ing the right file once you can actually reach it.
6
Cleanup (bonus). Every box leaves a real auth.log behind -- shred it before you're done to cover your tracks.
New here? The moment you create an account, we walk you through your first box step by step. Three more guided missions cover different techniques after that, and the LESSONS tab explains any tool in plain language, anytime.
Story Mode

Same real techniques. An actual plot this time.

A message from someone going by nullpoint, part of a hacktivist network: a school's camera system has a login page that shouldn't be reachable from outside the network. You're asked to look. Chapter 1 is free to play right now, no strings attached -- same recon-foothold-privesc playbook as every other box, just wrapped in an actual story.

The Hook

You find a spreadsheet that shouldn't exist -- a watchlist tracking students for things like attending a walkout, or just posting about the camera policy online. The "safety" system isn't safety. It's surveillance wearing a friendly name.

Where It's Headed

That one school's data doesn't stay at that one school. The full campaign follows the thread from a single district to a regional data broker to a federal contractor quietly building a nationwide tracking system -- and the people running it start hunting back.

What this is not

Fictional, on purpose

Pricing

Free to learn the basics, paid to go further

Free
$0/forever
  • Unlimited Random Easy boxes
  • This Week's Challenge -- same target for everyone, weekly reset
  • 4-part guided tutorial across different real techniques
  • Plain-language Lessons tab, no jargon
  • Story Mode Chapter 1 -- free, no strings attached
  • Public profile page of your completions
START FREE
VulnBox Pro
$4.99/mo
  • Everything in Free
  • Random Medium boxes
  • Random Hard boxes
  • Hard -- Chained (two-machine pivot scenario)
  • Story Mode Chapters 2 and 3
GO PRO

Your first target is one click away.

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