Cisco Wireless Control System (WCS) for Linux and Windows 4.0(1) and earlier uses a default administrator username "root" and password "public," which allows remote attackers to gain access (aka bug CSCse21391).
https://exchange.xforce.ibmcloud.com/vulnerabilities/27439
http://www.vupen.com/english/advisories/2006/2583
http://www.securityfocus.com/bid/18701
http://www.cisco.com/warp/public/707/cisco-sa-20060628-wcs.shtml