How secure is vserver?

Good day.

How secure is vserver? From

http://linux-vserver.org/Welcome_to_Linux-VServer.org

it is not clear to me: "guarantee the required
security"

as what are the requirements. Can You explain its isolation level? Say, If I
place there a server, and one day it will be hacked so that the criminal gets
full control of the guest OS, - will it protect the host OS?

Thank You for Your time.


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