I remember IRIX as that operating system that had an amazing number of exploits, and they went unpatched for so long. It looked like there wasn't a buffer that they wouldn't overflow...
That's fair, it wasn't exactly secure on the OS level, fun stuff like the help function allowing a backdoor to a user account. But to be fair to SGI this was exactly the era when the internet went from 'small village' to 'megapolis' and that brought the vermin right along with the funding.
Yeah, there were so many easy exploits that we regularly used them for our many SGI workstations when we didn't have the root password for that specific machine.