The default configuration of IOS HTTP server in Cisco Router Web Setup (CRWS) before 3.3.0 build 31 does not require credentials, which allows remote attackers to access the server with arbitrary privilege levels, aka bug CSCsa78190.
secunia.com/advisories/21028
securitytracker.com/id?1016476
www.cisco.com/warp/public/707/cisco-sa-20060712-crws.shtml
www.kb.cert.org/vuls/id/205225
www.osvdb.org/27159
www.securityfocus.com/bid/18953
www.vupen.com/english/advisories/2006/2773
exchange.xforce.ibmcloud.com/vulnerabilities/27688
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5826