Hottest cybersecurity open-source tools of the month: August 2025
This month’s roundup features exceptional open-source cybersecurity tools that are gaining attention for strengthening security across various environments.
Buttercup: Open-source AI-driven system detects and patches vulnerabilities
Buttercup is a free, automated, AI-powered platform that finds and fixes vulnerabilities in open-source software. Developed by Trail of Bits, it recently earned second place in DARPA’s AI Cyber Challenge (AIxCC).
EntraGoat: Vulnerable Microsoft Entra ID infrastructure to simulate identity security misconfigurations
EntraGoat is a purpose-built tool that sets up a vulnerable Microsoft Entra ID environment to mimic real-world identity security issues. It’s designed to help security professionals practice spotting and exploiting common misconfigurations.
LudusHound: Open-source tool brings BloodHound data to life
LudusHound is an open-source tool that takes BloodHound data and uses it to set up a working Ludus Range for safe testing. It creates a copy of an Active Directory environment using previously gathered BloodHound data.
Kopia: Open-source encrypted backup tool for Windows, macOS, Linux
Kopia is an open-source backup and restore tool that lets you create encrypted snapshots of your files and store them in cloud storage, on a remote server, on network-attached storage, or on your own computer.
Must read:
- 35 open-source security tools to power your red team, SOC, and cloud security
- GitHub CISO on security strategy and collaborating with the open-source community
Subscribe to the Help Net Security ad-free monthly newsletter to stay informed on the essential open-source cybersecurity tools. Subscribe here!