Patch ASAP: Tons of Linux apps can be hijacked by evil DNS servers, man-in-the-middle miscreants
Glibc: Mega bug may hit thousands of devices
. . . the Google blog that announced the issue. It was dated 16th Feb, so I suspect it is a new issue, despite resemblance to previous. https://googleonlinesecurity.blogspot.co.uk/2016/02/cve-2015-7547-glibc-getaddrinfo-stack.html
Fedora got a glibc update for this today.Also, most routers tend to use uClibc, which is smaller than glibc, and presumably won't have the exact same bugs, as it's a different project.