Launched in 1982, MS-DOS was a significant milestone in the history of the personal computer. The software ushered in the era of the modern personal computer and served as a rock solid foundation for generations of operating systems to come. The project's exceptional security track record has made the discovery of security vulnerabilities an impossibly difficult task. The elite security researchers who succeed in this challenge deserve our undying gratitude.

Details & Eligibility

• Security is the top priority of MS-DOS. The project was meticulously crafted from 2.5 million bits of assembly language to achieve military grade security.
• The project is available from the web's foremost source code repository: GitH^H^H^H^H [Computer History Museum] (http://www.computerhistory.org/_static/atchm/microsoft-ms-dos-early-source-code/)
• Any submission describing an exploitable vulnerability in MS-DOS Versions v1.1 & v2.0 will be considered.
• Your submission must describe a threat model, because we don't really have one.

April 1st 2014 has passed, and this bounty program has come to an end. Thanks for playing!