[jeroenhd]

Disabling UPnP makes your system more secure, but unless you also disable all NAT ALGs in your router, you're still exposed to its dangers.

I don't think most routers have a setting for that, so if infected devices are part of your security model, it would be wise to assume NAT is entirely non-functional because of [NAT slipstream attacks](https://samy.pl/slipstream/). An infected device can modify the router's NAT table to effectively act like UPnP, except they don't provide a user interface for you to audit.

If you're NAT free (i.e. only use IPv6) disabling UPnP can be a decent security measure if you're willing to manually do all of your firewall exclusions, but honestly host firewalls are the only reliable protection method for most people these days.