Mike Lynn publicly released flaws to Cisco routers and presented at the Black Hat and Defcon 13. Cisco and ISS obtained a court order barring Lynn and the Black Hat organization from further disseminating of his presentation.

Heres is how to find it.

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Here is a video of Cisco actually tearing pages out of the Black Hat books: http://downloads.oreilly.com/make/cisco.mov

Why is Cisco doing this?

Apparently, they were going to release the product with the same flaw.

Appearently hackers are not happy.