The web-based management interface in Cisco Secure Access Control System (ACS) 5.1 before 5.1.0.44.6 and 5.2 before 5.2.0.26.3 allows remote attackers to change arbitrary user passwords via unspecified vectors, aka Bug ID CSCtl77440.
https://exchange.xforce.ibmcloud.com/vulnerabilities/66471
http://www.vupen.com/english/advisories/2011/0821
http://www.securityfocus.com/bid/47093
http://www.cisco.com/en/US/products/products_security_advisory09186a0080b74117.shtml