#OpenSSH has fully deleted SSHv1. It was disabled at run time, then disabled at compile time, and now it's completely gone.
It's been recommended to use SSHv2 for at least 10 years, so even hardware routers should be compatible.
Good riddance SSHv1, we won't miss you.
@phessler "Build one to throw away" -- Frederick Brooks, 'The Mythical Man-Month'
@phessler don't be that evil with sshv1. Remember it appeared at a time where the only choices were telnet or rlogin. So, it deserves more a "happy retirement" speech than a "good riddance" one...