It turns out that a couple of recent leading Netgear routers are at risk of being exploited due to a severe security flaw.
Technical details here: https://www.kb.cert.org/vuls/id/582384
The netgear models known to be affected are the R7000 and R6400 routers (and possibly other Netgear routers)
You are strongly advised to stop using the routers until a patch has been released.
Firmware R7000-V188.8.131.52 is the current and flawed firmware (for R7000 model); check back here for an update when it has been released: