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This project contains the source code for the CERT Basic Fuzzing Framework (BFF)

BFF for Windows was formerly known as the CERT Failure Observation Engine (FOE).

If you are looking for runnable code, you should download the latest releases at:

Using this code

Depending on your preferred level of difficulty and experience points, choose from the options below.


Most of the BFF code can be found in the certfuzz package src/certfuzz. To try out the certfuzz code in an existing installation of BFF, replace the certfuzz directory in your installation with the certfuzz directory found in this repository.


Some platform-specific stuff is in src/windows and src/linux. BFF for OSX uses src/linux too. See src/linux/README and src/windows/README.txt for platform-specific readmes, and src/linux/INSTALL if you are feeling extra adventurous.


We actually use a continuous integration system with some platform-specific tools in conjunction with the code in the build/ directory to build the releases found at the links above. However, at this time the build code is not expected to work anywhere other than that environment. In fact, the code in the master branch is svn-centric so it didn't even work when we switched to git. We've fixed that in our internal development system, but have not yet merged that in with the code posted here.

Furthermore, the build scripts modify some files and move things around to put together the release packages and build installers. The filenames (but not necessarily the locations) in the src/ directories usually stay intact though so you should be able to figure out where things go if you are looking outside the src/certfuzz directory. (As mentioned in the Easy section above, src/certfuzz should just be a drop-in replacement.)

If all that seems more like a challenge than a warning, go for it.


See src/experimental/ for some dead ends that might be marginally useful.

About BFF

The CERT Basic Fuzzing Framework (BFF) is a software testing tool that finds defects in applications that run on Linux, Mac OS X and Windows.

BFF performs mutational fuzzing on software that consumes file input. They automatically collect test cases that cause software to crash in unique ways, as well as debugging information associated with the crashes. The goal of BFF is to minimize the effort required for software vendors and security researchers to efficiently discover and analyze security vulnerabilities found via fuzzing.

A brief history of BFF and FOE

BFF and FOE started out as two separate but related projects within the CERT/CC Vulnerability Analysis team. Over time, they converged in their architecture to the point where BFF 2.7 and FOE 2.1 shared much of their code. As of BFF 2.8, this integration is complete and we have retired the name FOE in favor of BFF.

For more information

Blog posts about BFF and FOE can be found in the Vulnerability Discovery category on the CERT/CC Blog