Provide references for CVE-2011-4921.
Where can I find more information about CVE-2011-4921?
References are available at: http://secunia.com/advisories/46706, https://exchange.xforce.ibmcloud.com/vulnerabilities/72011, http://osvdb.org/78050, http://www.securityfocus.com/bid/51253, http://www.openwall.com/lists/oss-security/2012/01/04/3.