A patch has been applied to the current development FreeBSD source tree which is not yet released. This patch is slightly modified compared to posted one, i.e. only variables which affects FreeBSD are disabled. It is telnetd patch, not a login wrapper. For the official patch, location please contact Jordan Hubbard . Harris Computer Systems Corporation's Night Hawk is not vulnerable.
Patches are available.
Binaries, sources and the diffs against the bsd telnetd can be found there. The telnetd distributed with Slackware Linux appears to be vulnerable, although it has not been verified. NetBSD-current is not vulnerable, as of a week or so ago. A core team member will have to make source and binary patches available and provide a location for it. Some NEC systems are vulnerable.