Actually, I've been wondering lately, just how common are router compromises? I ask because I have a Synology unit that was infected with some pretty insidious

Actually, I've been wondering lately, just how common are router compromises? I ask because I have a Synology unit that was infected with some pretty insidious malware just by being out on the open internet and having a slightly out-of-date OS version. Since it's now easily possible to scan the entire IPv4 address space, it makes me wonder if having out-of-date firmware would basically guarantee a hacked router these days.