The printf code has a notable bug where it will run off the end of the argument and access whatever memory happens to be behind it if the argument has an escape sequence. This might lead to a stack smash and arbitary code execution. Everything after the first character is not supposed to be there.
printf "%b\n" '\051'
)SSH_CLIENT=10.2.3.7 61477 22
It also doesn't handle further escape sequences in the argument.