A few days ago there was a zero-day exploit announced for Solaris that allowed people to use TELNET to gain root access to your machine.  This seems pretty bad and a lot of people on the inter-web are freaking over it.

However, the question is not:  "How did this bug go undiscovered?"

The question should be:  "What were you smoking when you enabled the TELNET daemon facing the public Internet??"  (and can I have some?)