Researchers at Germany's Fraunhofer Institute for Communication (FKIE) studied 127 home routers from seven brands and found that 46 had not had a security update within the past year.
The study also revealed that many routers have hundreds of known vulnerabilities, and that vendors are shipping firmware updates without fixing known vulnerabilities.
The researchers further found that German router manufacturer AVM was the only one that didn't publish private cryptographic keys in its router firmware.
A Linux operating system was used by about 90% of the routers studied, but researchers found that manufacturers were not updating it.
Said FKIE's Johannes vom Dorp, "Really, all the manufacturers would have to do is install the latest software, but they do not integrate it to the extent that they could and should."
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