The OWASP CTF Project is designed to be used during (OWASP) conferences as an 'entertainment' to all the sessions that are available. Due to this nature, as it contains various challenges that allow participant to win prices at an event, the source code of the challenges is not disclosed, but the framework is publicly available. This framework is designed to be open for modification, extension so that people can use it as a base to hold their own CTF events.


The purpose of this Project is to create a competitive environment which can be used at conferences and to have fun and teach in a playful way the various mistakes which are made in regards to web applications.


The OWASP CTF Project a web base hacking challenge application with challenges categorized in web, network and ‘others’. You require creativity, resourcefulness and networking skills to solve the various challenges. (a copy of the Live CD can help as well)

Open Source?

First of all... sorry, but of course, we can not make the CTF and all challenges opensource. Hereby my apologies for not being as open as I want OWASP and OWASP projects to be. ..I know you understand! Ahead of the OWASP AppSec-NY in 2009, the idea came up to supply an OWASP CTF event. This has been repeated successfully for the AppSec-EU 2009. Both developed by volunteering individuals, putting in a big amount of work, building the CTF from scratch. As the CTF event was warmly welcomed by those who participated, it was clear, the CTF has to become a event available for each OWASP event. To make this possible, the CTF project has been created!

Unfortunately, and I guess you understand, we can't share the current used CTF freely. For previous CTF applications and challenges, please see the download section. To get the CTF at your (OWASP) event, send an email to steven.van.der.baan 'at' owasp.org.




As we can not make the current CTF and challenges available, so what is available to download? We will share previous used CTF applications, not longer used! Further, we are currently working on a plug-in system for the challenges. We will release a setup where to install challenges as plugins, soon. Also, we will continuously make obsolete challenges available to download! Available downloads:

  • Framework
  • Initial challenge

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News and Events

  • [20 Nov 2013] News 2
  • [30 Sep 2013] News 1

In Print


What is CTF?


OWASP CTF Project provides:

OWASP CTF Project provides:

    • web related challenges
    • web related challenges
    • entertainment at conferences
    • entertainment at conferences



Project Leader

Project Leader

Steven van der Baan

Steven van der Baan


Playing the CTF

Playing the CTF

The rules to participate and playing the CTF might change depending to the event the CTF is organized at. What you find below is what we think, the CTF should be done..


Register at the CTF organizer with your MAC address and participant name. Once you have access to the application, register with your chosen game name and the game is started. You can join whenever you like when the game has started until the declared end of the game.


  • You play with your own laptop.
  • The game is open during the conference time.
  • Attacking the CTF outside of the challenges results in disqualification.
  • Attacking CTF competitors results in disqualification.


  • For each solved challenge you get one point.
  • Who has the most challenges solved wins.
  • By same score, first scored wins.
  • Groups and single player are treated the same
  • This is a proposal of rules. Those can be changed, depending on the event where the CTF is held.

Who can anticipate in the CTF?

  • Single Players, every one can participate in a CTF event by themselves.
  • Groups, you can team up with others and participate as a group. Dividing the prices is the responsibility of the group members, though.

Pointing System

  • With each challenge you can get a certain score, depending on the difficulty of the challenge. After solving a challenge, a key is gained. You will have to insert that key into your account screen and points are added to your account. In case of same number of points, whoever scores first wins.
  • With the current CTF system all challenges are worth one (1) point.


The challenges are categorized in Web, Networking and Forensic.

  • Web challenges
  • Networking challenges
  • Forensic challenges

The current CTF contains the following categories:

  • Web; your “default” web challenges
  • Networking; networking related challenges
  • Others; all other challenges that can’t be fitted under the other categories.

Score Board

The scoreboard will display the ranking of all playing users.

Past Events

  • Confidence 2008
  • OWASP Appsec Europe 2008
  • AppSec-EU Poland 2009
  • AppSec-DC 2009
  • AppSec-EU Stockholm 2010
  • HITB Amsterdam 2010
  • AppSec-USA 2010
  • GovWare Singapore 2010
  • AppSec-Brazil 2010
  • OWASP BeNeLux day 2010
  • HITB Amsterdam 2011
  • AppSec-EU Dublin 2011
  • AppSec-USA Minneapolis 2011
  • OWASP Benelux day 2011
  • OWASP Appsec EU Athens 2012
  • AppSec-USA Austin 2012
  • OWASP BeNeLux day 2012
  • OWASP Appsec EU Hamburg 2013
  • AppSec-USA New York 2013
  • OWASP Appsec EU Cambridge 2014


  • Can I have a copy of the challenges? Short answer, no. Long answer, depending on the ‘strength’ of the challenges they will be reused across multiple Capture the Flag events. Releasing the challenges might bring an unfair advantage to some of the players.
  • How can I help? Everybody can help by providing challenges, or ideas for challenges.



CTF is developed by a worldwide team of volunteers. The primary contributors to date have been:

Road Map and Getting Involved

As of 2014, the priorities are:

  • Development
    • Framework

The framework is almost finished. The final quirkes are tested at the Owasp BeNeLux days and will be uploaded afterwards. The latest design and logo (thanks to my wife) are used, waiting on some feedback from actual players. The next version of the framework will contain a better template mechanism for customisation and a construction to be able to play network challenges without having to worry of you hackers taking over the complete system ;)

  • Challenges

The various challenges that will be released depend on the feedback from the various events where the CTF has been held. The easiest challenges will slowly disapear from the CTF and will be made available for download.

  • Obsolete

Involvement in the development and promotion of the CTF is actively encouraged! We need people who can help in designing and building challenges. Feel free to send ideas (or even finished challenges) to Steven ([email protected]) and he’ll try to include it in the CTF.

Project About


Category:OWASP Project Category:OWASP_Builders Category:OWASP_Defenders Category:OWASP_Document


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