It's a case of slightly relaxing security for convenience, though generally, the risk isn't high for home users. The technology is also far from standardized, meaning implementations can vary between routers, especially on older or less reputable models. So there might be some related security risk here. Malicious programs can leverage UPnP vulnerabilities, simply as a result of its open nature. You should note that UPnP has seen heavy criticism in the past, due to a long list of security flaws associated with the technology. And for many, it's a simple flick of a switch. UPnP essentially allows applications to forward ports automatically, avoiding the hassle of manual "port forwarding." Although they often achieve the same end result, UPnP allows the console to request a port seamlessly, rather than requiring specific port numbers to be entered manually. Ports are digital channels for your router, used for sorting incoming and outgoing internet traffic.
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