Depending on how old and out of date it is, you may be able to get root easily with the Dirty Frag POC https://github.com/V4bel/dirtyfrag/blob/master/README.md#exploiting
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What OS and what version is it running? Besides a VPN, are there other services your RPi is running?You should run an nmap scan of the device or try a vulnerability scanner like OpenVAS.
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