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Pwning "MonitorsFour": From API Fuzzing to Docker Breakout

Pwning "MonitorsFour": From API Fuzzing to Docker Breakout

December 7, 2025
7 min read

Sup hackers. Today we’re tearing apart MonitorsFour. I’m not gonna lie, this box was a massive pain in the ass. It kept resetting every 10 minutes and took another 7 just to boot up. I basically spent half my time staring at a “Connection Refused” screen and contemplating my life choices. But we got there.

Here’s how I went from zero to full Windows Host takeover.

Phase 1: Recon & The API Rabbit Hole

Nmap scan results

Started with the basics. Fired up nmap and gobuster dns. I noticed a subdomain cacti.monitorsfour.htb hanging out.

cacti subdomain