The Austin, Texas-based Rumble on Monday announced it had banked a new $15 million in Series A financing from Decibel Partners and a laundry-list of boldface cybersecurity practitioners.

Rumble, created by HD Moore (of Metasploit fame), sells technology to help defenders monitor exposed attack surfaces. The company said the new money will help accelerate go-to-market and engineering initiatives.

Since closing its seed round last March, Rumble claims it has quadrupled its customer base in a growth spurt that saw ARR increase five-fold in 2021.