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With nmcli, I can modify VPN data like this:

nmcli con modify myvpn vpn.data 'refuse-pap = yes, user = xxx'

So I'm wondering if I can set password this way as well?

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Yes, you can modify the value of any property with nmcli. In this case, you would use:

nmcli con modify "myvpn" vpn.secrets "password=myverysecretpassword"
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    Note that this will, of course, echo your password as you type it. Commented Mar 6, 2018 at 17:24
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    It will also store your password in your shell history. Commented Apr 29, 2018 at 15:05
  • and if you use gpaste and it stores history and you copied your password from something else like lastpass that buffer will have it too ;-) Commented Jun 25, 2021 at 14:35
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    This answer shows how to prevent echoing/saving the password: askubuntu.com/a/1179680/732215 -- (IFS='' read -s -r -p '802.1X password '; nmcli connection modify id example 802-1x.password "$REPLY") Commented Jul 15, 2021 at 5:37
  • That can still put the password in the process table though very very briefly! Commented Aug 10, 2021 at 0:04

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