ffuf – Fuzz Faster U Fool, Written in GO



  • Download a prebuilt binary from releases page, unpack and run! or
  • If you have recent go compiler installed: go get -u github.com/ffuf/ffuf (the same command works for updating) or
  • git clone https://github.com/ffuf/ffuf ; cd ffuf ; go get ; go build

Ffuf depends on Go 1.13 or greater.

Example usage

The usage examples below show just the simplest tasks you can accomplish using ffuf.

For more extensive documentation, with real life usage examples and tips, be sure to check out the awesome guide: “Everything you need to know about FFUF” by Michael Skelton (@codingo).

Typical directory discovery


By using the FUZZ keyword at the end of URL (-u):

ffuf -w /path/to/wordlist -u https://target/FUZZ

Virtual host discovery (without DNS records)


Assuming that the default virtualhost response size is 4242 bytes, we can filter out all the responses of that size (-fs 4242)while fuzzing the Host – header:

ffuf -w /path/to/vhost/wordlist -u https://target -H "Host: FUZZ" -fs 4242

GET parameter fuzzing

GET parameter name fuzzing is very similar to directory discovery, and works by defining the FUZZ keyword as a part of the URL. This also assumes an response size of 4242 bytes for invalid GET parameter name.

ffuf -w /path/to/paramnames.txt -u https://target/script.php?FUZZ=test_value -fs 4242

If the parameter name is known, the values can be fuzzed the same way. This example assumes a wrong parameter value returning HTTP response code 401.

ffuf -w /path/to/values.txt -u https://target/script.php?valid_name=FUZZ -fc 401

POST data fuzzing

This is a very straightforward operation, again by using the FUZZ keyword. This example is fuzzing only part of the POST request. We’re again filtering out the 401 responses.

ffuf -w /path/to/postdata.txt -X POST -d "username=admin\&password=FUZZ" -u https://target/login.php -fc 401

Maximum execution time

If you don’t want ffuf to run indefinitely, you can use the -maxtime. This stops the entire process after a given time (in seconds).

ffuf -w /path/to/wordlist -u https://target/FUZZ -maxtime 60

When working with recursion, you can control the maxtime per job using -maxtime-job. This will stop the current job after a given time (in seconds) and continue with the next one. New jobs are created when the recursion functionality detects a subdirectory.

ffuf -w /path/to/wordlist -u https://target/FUZZ -maxtime-job 60 -recursion -recursion-depth 2

It is also possible to combine both flags limiting the per job maximum execution time as well as the overall execution time. If you do not use recursion then both flags behave equally.

Using external mutator to produce test cases

For this example, we’ll fuzz JSON data that’s sent over POST. Radamsa is used as the mutator.

When --input-cmd is used, ffuf will display matches as their position. This same position value will be available for the callee as an environment variable $FFUF_NUM. We’ll use this position value as the seed for the mutator. Files example1.txt and example2.txt contain valid JSON payloads. We are matching all the responses, but filtering out response code 400 - Bad request:

ffuf --input-cmd 'radamsa --seed $FFUF_NUM example1.txt example2.txt' -H "Content-Type: application/json" -X POST -u https://ffuf.io.fi/FUZZ -mc all -fc 400

It of course isn’t very efficient to call the mutator for each payload, so we can also pre-generate the payloads, still using Radamsa as an example:

# Generate 1000 example payloads
radamsa -n 1000 -o %n.txt example1.txt example2.txt

# This results into files 1.txt ... 1000.txt
# Now we can just read the payload data in a loop from file for ffuf

ffuf --input-cmd 'cat $FFUF_NUM.txt' -H "Content-Type: application/json" -X POST -u https://ffuf.io.fi/ -mc all -fc 400

Configuration files

When running ffuf, it first checks if a default configuration file exists. The file path for it is ~/.ffufrc / $HOME/.ffufrc for most *nixes (for example /home/joohoi/.ffufrc) and %USERPROFILE%\.ffufrc for Windows. You can configure one or multiple options in this file, and they will be applied on every subsequent ffuf job. An example of .ffufrc file can be found here.

The configuration options provided on the command line override the ones loaded from ~/.ffufrc. Note: this does not apply for CLI flags that can be provided more than once. One of such examples is -H (header) flag. In this case, the -H values provided on the command line will be appended to the ones from the config file instead.

Additionally, in case you wish to use bunch of configuration files for different use cases, you can do this by defining the configuration file path using -config command line flag that takes the file path to the configuration file as its parameter.


To define the test case for ffuf, use the keyword FUZZ anywhere in the URL (-u), headers (-H), or POST data (-d).

Fuzz Faster U Fool - v1.2.0-git

  -H                  Header `"Name: Value"`, separated by colon. Multiple -H flags are accepted.
  -X                  HTTP method to use
  -b                  Cookie data `"NAME1=VALUE1; NAME2=VALUE2"` for copy as curl functionality.
  -d                  POST data
  -ignore-body        Do not fetch the response content. (default: false)
  -r                  Follow redirects (default: false)
  -recursion          Scan recursively. Only FUZZ keyword is supported, and URL (-u) has to end in it. (default: false)
  -recursion-depth    Maximum recursion depth. (default: 0)
  -recursion-strategy Recursion strategy: "default" for a redirect based, and "greedy" to recurse on all matches (default: default)
  -replay-proxy       Replay matched requests using this proxy.
  -timeout            HTTP request timeout in seconds. (default: 10)
  -u                  Target URL
  -x                  Proxy URL (SOCKS5 or HTTP). For example: or socks5://

  -V               Show version information. (default: false)
  -ac              Automatically calibrate filtering options (default: false)
  -acc             Custom auto-calibration string. Can be used multiple times. Implies -ac
  -c               Colorize output. (default: false)
  -config          Load configuration from a file
  -maxtime         Maximum running time in seconds for entire process. (default: 0)
  -maxtime-job     Maximum running time in seconds per job. (default: 0)
  -p               Seconds of `delay` between requests, or a range of random delay. For example "0.1" or "0.1-2.0"
  -rate            Rate of requests per second (default: 0)
  -s               Do not print additional information (silent mode) (default: false)
  -sa              Stop on all error cases. Implies -sf and -se. (default: false)
  -se              Stop on spurious errors (default: false)
  -sf              Stop when > 95% of responses return 403 Forbidden (default: false)
  -t               Number of concurrent threads. (default: 40)
  -v               Verbose output, printing full URL and redirect location (if any) with the results. (default: false)

  -mc              Match HTTP status codes, or "all" for everything. (default: 200,204,301,302,307,401,403,405)
  -ml              Match amount of lines in response
  -mr              Match regexp
  -ms              Match HTTP response size
  -mw              Match amount of words in response

  -fc              Filter HTTP status codes from response. Comma separated list of codes and ranges
  -fl              Filter by amount of lines in response. Comma separated list of line counts and ranges
  -fr              Filter regexp
  -fs              Filter HTTP response size. Comma separated list of sizes and ranges
  -fw              Filter by amount of words in response. Comma separated list of word counts and ranges

  -D               DirSearch wordlist compatibility mode. Used in conjunction with -e flag. (default: false)
  -e               Comma separated list of extensions. Extends FUZZ keyword.
  -ic              Ignore wordlist comments (default: false)
  -input-cmd       Command producing the input. --input-num is required when using this input method. Overrides -w.
  -input-num       Number of inputs to test. Used in conjunction with --input-cmd. (default: 100)
  -mode            Multi-wordlist operation mode. Available modes: clusterbomb, pitchfork (default: clusterbomb)
  -request         File containing the raw http request
  -request-proto   Protocol to use along with raw request (default: https)
  -w               Wordlist file path and (optional) keyword separated by colon. eg. '/path/to/wordlist:KEYWORD'

  -debug-log       Write all of the internal logging to the specified file.
  -o               Write output to file
  -od              Directory path to store matched results to.
  -of              Output file format. Available formats: json, ejson, html, md, csv, ecsv (or, 'all' for all formats) (default: json)
  -or              Don't create the output file if we don't have results

  Fuzz file paths from wordlist.txt, match all responses but filter out those with content-size 42.
  Colored, verbose output.
    ffuf -w wordlist.txt -u https://example.org/FUZZ -mc all -fs 42 -c -v

  Fuzz Host-header, match HTTP 200 responses.
    ffuf -w hosts.txt -u https://example.org/ -H "Host: FUZZ" -mc 200

  Fuzz POST JSON data. Match all responses not containing text "error".
    ffuf -w entries.txt -u https://example.org/ -X POST -H "Content-Type: application/json" \
      -d '{"name": "FUZZ", "anotherkey": "anothervalue"}' -fr "error"

  Fuzz multiple locations. Match only responses reflecting the value of "VAL" keyword. Colored.
    ffuf -w params.txt:PARAM -w values.txt:VAL -u https://example.org/?PARAM=VAL -mr "VAL" -c

  More information and examples: https://github.com/ffuf/ffuf

Interactive mode

By pressing ENTER during ffuf execution, the process is paused and user is dropped to a shell-like interactive mode:

entering interactive mode
type "help" for a list of commands, or ENTER to resume.
> help

available commands:
 fc [value]             - (re)configure status code filter 
 fl [value]             - (re)configure line count filter 
 fw [value]             - (re)configure word count filter 
 fs [value]             - (re)configure size filter 
 queueshow              - show recursive job queue
 queuedel [number]      - delete a recursion job in the queue
 queueskip              - advance to the next queued recursion job
 restart                - restart and resume the current ffuf job
 resume                 - resume current ffuf job (or: ENTER) 
 show                   - show results
 savejson [filename]    - save current matches to a file
 help                   - you are looking at it

in this mode, filters can be reconfigured, queue managed and the current state saved to disk.

When (re)configuring the filters, they get applied posthumously and all the false positive matches from memory that would have been filtered out by the newly added filters get deleted.

The new state of matches can be printed out with a command show that will print out all the matches as like they would have been found by ffuf.

As “negative” matches are not stored to memory, relaxing the filters cannot unfortunately bring back the lost matches. For this kind of scenario, the user is able to use the command restart, which resets the state and starts the current job from the beginning.

Download: https://github.com/ffuf/ffuf

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