Code: Linksys WRT54GS is prone to an authentication bypass vulnerability. Reportedly the device permits client devices that are using no encryption to connect when an encryption setting is being used. An attacker can exploit this vulnerability to bypass authentication and connect to a wireless network thought to be encrypted. This results in a false sense of security. This issue is reported to affect firmware version 4.50.6; other firmware versions may also be affected. This issue also appears to have been addressed in firmware version 4.70.6; this has not been confirmed by Symantec or the vendor. http://www.securityfocus.com/bid/14566/discuss I was able to connect to my wlan with windows xp without entering a wpa-key. After rebooting the wrt everything was fine. Well, it seems that this could also affect dd-wrt v23.