Hottest cybersecurity open-source tools of the month: May 2025 – Help Net Security

This month’s roundup features exceptional open-source cybersecurity tools that are gaining attention for strengthening security across various environments.

Vuls is an open-source tool that helps users find and manage security vulnerabilities. It was created to solve the daily problems admins face when trying to keep servers secure.


LlamaFirewall is a system-level security framework for LLM-powered applications, built with a modular design to support layered, adaptive defense. It is designed to mitigate a wide spectrum of AI agent security risks including jailbreaking and indirect prompt injection, goal hijacking, and insecure code outputs.


Hanko is an open-source, API-first authentication solution purpose-built for the passwordless era.


Cerbos is an open-source solution designed to simplify and modernize access control for cloud-native, microservice-based applications.

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