Cisco has closed a security flaw in its wireless Lan controllers could let attackers send malicious traffic to secured Wi-Fi networks.
The problem affects large Wi-Fi networks using Cisco 1200, 1131 and 1240 series Wi-Fi access points that are controlled by Cisco 2000 and 4400 series Airespace wireless Lan controllers. The bug does not affect smaller networks and those used in the home.
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The affected products are used to control larger numbers of access points, managing functions such as security policies and intrusion prevention.
Cisco said the flaw meant access points might accept unencrypted incoming traffic, even when the points had been configured to accept encrypted traffic only, allowing an attacker to unleash malicious traffic on a supposedly secure wireless network.
The company has released a software update to make sure the affected controllers fully protect networks.
Cisco issued another patch this week to protect a security hole in its main IOS router operating system.