# efiXplorer: automated UEFI firmware analysis in IDA

> efiXplorer is an IDA Pro plugin and a separate loader for UEFI firmware analysis, built to hunt firmware vulnerabilities at scale and to recover service function calls statically rather than by tracing. It suits a firmware security researcher with a large image corpus and a hex-rays licence, and it is published as two pieces you install separately.

**REhints/efiXplorer** — IDA plugin and loader for UEFI firmware analysis and reverse engineering automation

- Repository: https://github.com/REhints/efiXplorer
- Stars: 1,140 · Forks: 130
- Language: C++
- License: GPL-3.0
- Published: 2026-10-19 · Updated: 2026-10-19 · Language: en
- Canonical page: https://hysenlabs.com/projects/rehints-efixplorer

## Two pieces of software, not one

efiXplorer is described as an IDA plugin and loader for UEFI firmware analysis and reverse engineering automation, and the two halves are documented separately. The plugin has its own wiki page, the efiXplorer features page, and the loader has its own, the efiXloader page, with a third wiki page covering build instructions and installation. The repository layout mirrors that split, with a `plugin/` directory and a `loader/` directory beside each other, plus a `guids/` directory, which tells you the project carries a database of EFI GUIDs rather than deriving them, and that the GUID knowledge is the part that a tool needs to make sense of a firmware image. There is also a `third_party/` directory and a `.gitmodules` file, so some dependencies are pulled in as submodules. The primary language is C++, the licence is GPL-3.0, the last push was on 2026-10-12, and the releases are v6.3.0 on 2026-08-20, v6.2.0 on 2026-02-17 and v6.1.2 on 2025-11-20.

## Building it

The build instructions live on the wiki page for build instructions and installation, and the repository root shows the shape of the build system. There is a `CMakeLists.txt` at the top, a `cmake/` directory for the CMake modules, a `build.py` script, an `ida-plugin.json` file describing the plugin to the IDA plugin manager, and a `pics/` directory holding the logo and other images. The presence of `ida-plugin.json` is the detail that tells you how the plugin is distributed, since that file is the manifest IDA reads when a plugin is installed through the plugin manager, and it carries the plugin metadata and entry point. The primary language recorded for the repository is C++, which is the expected choice for an IDA plugin, since a plugin has to be a loadable module rather than a script, and for a loader that has to sit in front of a firmware image.

## What the research behind it was trying to do

The publications section explains the purpose better than the tagline does. There is the Black Hat Europe 2020 paper, efiXplorer: Hunting for UEFI Firmware Vulnerabilities at Scale with Automated Static Analysis, and a second paper, Static analysis-based recovery of service function calls in UEFI firmware, presented at EKO 2020. The second one is the more revealing of the two, because recovering service function calls statically is the hard part of UEFI work. A firmware image is a large binary of mostly data, with a boot chain that dispatches into hardware-specific modules, and the question of which function implements a given service is normally answered by running the thing under an emulator and watching. Doing it statically means you can process an image without executing it, which is what makes it possible to look at thousands of vendor images rather than a handful. There is also a YouTube video on how the tool helps solve reverse engineering challenges, which is the practical demonstration.

## The Hex-Rays relationship, and what it means for the tool

The acknowledgements name Hex-Rays explicitly, thanking them for their support of the project through the Hex-Rays Contributor Program, along with all the contributors listed in `CONTRIBUTORS.md`. That single fact shapes everything about how you use the tool. efiXplorer is a plugin for IDA Pro, so it inherits IDA's licensing and its model of what an analyst is doing. The upside is that the analysis lands in an environment with decompilation, cross-references and a scriptable API, rather than in a standalone viewer that would need its own interface. The downside is the dependency. A tool for triaging thousands of firmware images wants automation, and automation on a commercial disassembler is a licensing conversation rather than a build question. The plugin is listed in the Hex-Rays plugin directory, which is the distribution path for something built in this ecosystem.

## The reference list, and the neighbouring projects

The README closes with a references section that is really a map of the UEFI tooling ecosystem, and it is worth reading as a list of what else exists and what each does. There is UEFITool by LongSoft, uefi_retool by yeggor, EFISwissKnife by gdbinit, ida-efiutils by snare, ghidra-firmware-utils by al3xtjames, efiSeek by DSecurity, ida-efitools2 by p-state and bn-uefi-helper by zznop. The naming pattern says a lot. Several are named after IDA, so the `ida-` prefixed ones are the ecosystem's own approach to the same problem in the same disassembler, and efiSeek and ghidra-firmware-utils are the equivalents for other tools. So efiXplorer sits in a crowded field, and the case for it over the alternatives is the research behind it, the automated static analysis for vulnerability hunting and the service function call recovery, rather than a broader feature set.

## What this is for, and where it stops

The framing of the tool is vulnerability hunting at scale, and that is a narrower goal than general firmware reverse engineering. A tool that recovers service function calls statically and lets you query firmware images by pattern is a triage instrument, and the workflow it enables is running automated analysis over a large corpus of vendor images to find the ones worth a human looking at. It is not a firmware unpacker in the sense of recovering a filesystem from an image, it is not a vulnerability scanner in the sense of finding a specific bug class, and it is not a way to run firmware. The other limit is the one every unofficial tool has. The work depends on the structure of real vendor firmware, on how a given vendor lays out its modules and names its services, and a change in those conventions is a change in what the tool can recognise. The version history suggests that kind of maintenance, with releases spread across 2025 and 2026 and the project still on a 6.x line.

## Conclusion

Adopt efiXplorer if you do UEFI firmware research and already use IDA Pro, since the plugin and the loader are built for exactly that workflow and the plugin is listed in the Hex-Rays plugin directory. Skip it if you need a general firmware unpacking tool, because this one assumes IDA as the analysis environment. Before you build, note that the project has two separate components with their own wiki pages, that the plugin and the loader are installed independently, and that the acknowledgements credit the Hex-Rays Contributor Program, so the work is tied to the IDA ecosystem rather than to a standalone binary.

## FAQ

### What is efiXplorer?

An IDA Pro plugin and a loader for UEFI firmware analysis and reverse engineering automation. The plugin and the loader are separate components with separate wiki pages, and the project is published in the Hex-Rays plugin directory.

### What research is efiXplorer built on?

The Black Hat Europe 2020 paper efiXplorer: Hunting for UEFI Firmware Vulnerabilities at Scale with Automated Static Analysis, and the EKO 2020 paper on static analysis-based recovery of service function calls in UEFI firmware.

### What licence is efiXplorer under?

The GNU General Public License version 3. The project is supported through the Hex-Rays Contributor Program, and contributors are listed in CONTRIBUTORS.md.

### Which other UEFI analysis tools does efiXplorer sit alongside?

The README references UEFITool, uefi_retool, EFISwissKnife, ida-efiutils, ghidra-firmware-utils, efiSeek, ida-efitools2 and bn-uefi-helper. Several are IDA-specific, and efiSeek and ghidra-firmware-utils cover the same ground for other tools.

## Sources

- [Issues](https://github.com/REhints/efiXplorer/issues)
- [License: GPL-3.0](https://github.com/REhints/efiXplorer/blob/master/LICENSE)
- [README](https://github.com/REhints/efiXplorer/blob/master/README.md)
- [REhints/efiXplorer on GitHub](https://github.com/REhints/efiXplorer)
- [Releases](https://github.com/REhints/efiXplorer/releases)

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Hysen Labs editorial analysis, written from the project's own repository and release notes. Cite the canonical page: https://hysenlabs.com/projects/rehints-efixplorer