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MARA (Mobile Antivirus Researchers Association) has compiled the top ten most critical Wireless and Mobile Security Vulnerabilities. The security issues covered include WiFi Access Points, Wireless Zero Configuration, Bluetooth, WEP Weaknesses, Smart phones, PDA and VOIP (Voice Over IP). Most of the issue shows there is an improper security configuration, so better get a qualified tech person for setting up a higher security protection.

1. Default WiFi routers

By default, wireless routers are shipped in an un-secured state. The result of this is that an attacker can easily connect to and configure the router to meet his or her own needs. The risks include changing the DNS server settings to a static IP that is owned by the attacker; or, uploading a hacked firmware version to the router that could put the attacker in full control of the data. Sniffing programs, wireless scanning drones, attack scripts, and more can be easily installed on the router, all of which would go undetected.
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More at MARA | source