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k@wifi:~$ export x='() { :; }; echo "Oh..."'
k@wifi:~$ echo $x
() { :; }; echo "Oh..."
k@wifi:~$ bash
Oh...
1) set any env variable
2) trigger execution of bash with any parameters. I guess exedsp often call shell.
UPDATE. False hope. Bash is not present on the system, only sh from busybox.