TP-Link TL-WDR4300 can run OpenWrt [1], a highly modular Linux distribution meant primarily for routers. If you have one of those routers and you're at all familiar with Linux should really consider upgrading to OpenWrt. Once you've got the web UI set up administering it becomes very similar to configuring "normal" routers.
Unfortunately, stock firmware that comes with a lot routers has just been no good even if it lacked gaping security holes like this. Fortunately, there are community-developed FOSS alternatives that offer a better user experience; I imagine that having more eyes on the source also helps their security. I use TomatoUSB [2] on my main router (Asus RT-N66U) and OpenWrt on the "experimental" one (TP-Link TL-MR3020) and can highly recommend both distributions.
I like Gargoyle firmware, which is based on OpenWrt. It has a simpler interface with QoS ready to go. The experimental version 1.5.9 has CoDel built in. So far the router seems to be handling VoIP better than the Asus RT-N16 running Shibby's TomatoUSB firmware.
TPLink routers are great for custom firmware, I use to run DD-WRT but now run OpenWRT.
OpenWRT takes a little longer to get setup but once you do it runs perfectly and doesn't require any changes (I've been running mine for over a year without a hitch, before that years with ddwrt).
A thumbs up for OpenWrt. I had been running a D-Link DIR655 before I got my WDR4300 setup with OpenWRT. Moving to OpenWRT fixed a good amount of problems I had been having with zeroconf announced services on my local zeroconf services. Netatalk, specifically, would only work for the first hour or so on the DIR655, but with OpenWRT on the WDR4300 it works perfectly.
The configuration is really quite fantastic, and you can do pretty much anything you could want.
More specifically, http://www.dd-wrt.com/ is fantastic, based on the OpenWRT kernel. I use it on all my routers now. I've been using it on my routers since 2006.
I was having major issues after two years, only last week, with an old Buffalo Wireless-N router. I switched over to DD-WRT last week and all was cured, and I'm getting better wireless performance.
Unfortunately, stock firmware that comes with a lot routers has just been no good even if it lacked gaping security holes like this. Fortunately, there are community-developed FOSS alternatives that offer a better user experience; I imagine that having more eyes on the source also helps their security. I use TomatoUSB [2] on my main router (Asus RT-N66U) and OpenWrt on the "experimental" one (TP-Link TL-MR3020) and can highly recommend both distributions.
[1] http://wiki.openwrt.org/toh/tp-link/tl-wdr4300
[2] http://tomatousb.org/