The Zero Day Initiative (ZDI), founded by TippingPoint, is a program for rewarding security researchers for responsibly disclosing vulnerabilities. Depending on who you are, here are a few links to get you started:
Researchers: Learn how we pay for your vulnerability discoveries, register for the ZDI or login.
Vendors: Read our disclosure policy or join our security partner program
Press, Curiosity Seeker: Learn more about ZDI or read answers to some frequently asked questions
Please contact us at zdi [at] tippingpoint [dot] com with any questions or queries. For sensitive e-mail communications, please use our PGP key