Home owners may think their home routers are secure, but a a report from Wall Street Journal staffer Jennifer Valentino-Devries should give them second thoughts. If router software has a bug and it's released, fixing that problem can be difficult.

Fixing bugs once they have been released into the world is sometimes difficult and often overlooked. The flaw’s creator must develop a fix, or “patch.” Then it often must alert millions of technically unsophisticated users, who have to install the patch.

The chain can break at many points: Patches aren’t distributed. Users aren’t alerted or neglect to apply the patch. Hackers exploit any weak link.

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