Description
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Making USB Accessible
Cynthion is an all-in-one tool for building, testing, monitoring, and experimenting with USB devices. Built around a unique FPGA-based architecture, Cynthion’s digital hardware can be fully customized to suit the application at hand. As a result, it can act as a no-compromise High-Speed USB protocol analyzer, a USB research multi-tool, or a USB development platform.
Out-of-the-box, Cynthion acts as a USB protocol analyzer capable of capturing and analyzing traffic between a host and any Low-, Full-, or High-Speed (“USB 2.0”) USB device. It works seamlessly with our open-source analysis software, Packetry.
Combined with LUNA gateware and Facedancer libraries, Cynthion becomes a versatile USB research and development tool. Facedancer makes it quick and easy to create or tamper with real USB devices—not just emulations—even if you don’t have experience with digital-hardware design, HDL, or FPGA architecture!
No extra cables are included! You may need a variety of USB A & C cables to connect to your computer/target.
Core Features
Cynthion is a fully reconfigurable test instrument that provides all the hardware, gateware, firmware, and software you need to work with—and, indeed, to master—USB. Below are a few of the challenges to which you can apply your Cynthion:
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Protocol analysis for Low-, Full-, and High- speed USB. Cynthion provides everything you need for passive USB monitoring. With Packetry USB analysis software, Cynthion provides everything you need for passive USB monitoring.
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Creating your own Low-, Full-, or High- speed USB device. LUNA provides Amaranth gateware that allows you to create USB devices in gateware, firmware, or a combination of the two. Using the Facedancer library, you can create or emulate real USB devices in high-level Python.
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Meddler-in-the-Middle (MitM) attacks on USB communication. Cynthion hardware can function as a "USB proxy" capable of transparently modifying USB data as it flows between a host and a device. Each board’s three USB Type-C connections allow for simultaneous, high-speed proxying while maintaining a high-speed connection to the host. As a result, you can proxy a connection with or without the help of a host PC.
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USB reverse engineering and security research. Cynthion hardware and LUNA gateware represent a purpose-built backend for research tools like Facedancer and USB-fuzzing libraries, thereby simplifying the emulation and rapid prototyping of compliant and non-compliant USB devices. Unlike other USB-emulation solutions, Cynthion-based hardware is dynamically reconfigurable, so it gives you the flexibility to create any endpoint configuration and engage in almost any USB (mis)behavior.
An Open-Source USB Protocol Analyzer

An Educational Platform for Learning About USB
Resources
- Documentation
- Hardware Design Files
- LUNA Gateware
- Debugger Firmware
- Software : Facedancer
- Software : Packetry
For assistance with Cynthion use or development, please look at the issues on the Cynthion GitHub project. This is the preferred place to ask questions so that others may locate the answer to your question in the future. For hardware issues use the cynthion-hardware repository.