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microchip
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"Eloi Vanderbeken from Synacktiv has identified an intentional backdoor in a module by Sercomm used by major router manufacturers (Cisco, Linksys, Netgear, etc.). The backdoor was ostensibly fixed — by obfuscating it and making it harder to access. The original report (PDF). And yeah, there is an exploit available ..."
http://tech.slashdot.org/story/14/04/22/001239/intentional-backdoor-in-consumer-routers-found