Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Don't make it available from internet. This will solve the issue.
If it is not possible, once the cve is published and properly described, perhaps there is another way to secure it via an external proxy or even a waf.
If you have unsupported Sw, it is always a pain in the ass to keep them secure so try to figure out always the first point
Thanks, I've read this countless times but that's basically half of the use I make from my NAS so no.
I'll try to secure it and still use it from outside / Internet then.
You will get compromised if you haven't already. (Your device becomes part of a botnet)
If you don't want new hardware use something actively supported like TrueNAS or regular Linux. You are asking for trouble. No hardening will protect you from out of date software with serious security holes.
Out of curiosity, how can I know if it's already the case?
Connecting to the NAS only via VPN won't be enough?
Yes, it will be enough if your services are not exposed via port forwarding , tailscale / zerotier are super convenient for this.
Honestly, if I were you I would start thinking in having a small computer just to act like a proxy / firewall of you synology, or even better, just run the applications on that computer and let the nas only serve files and data.
It is much easier to support, maintain and hardening a debain with a minimal intallation than nay synology box just because the amount of resources available to do so. In this easy way you could extent the life of your nas far beyond the end of life of the Sw
Tailscale is available as an official DSM package, so if it’s only you accessing it you could still block it from the Internet.