Unspecified vulnerability in the Java Runtime Environment (JRE) in Oracle Java SE and Java for Business 6 Update 23 and earlier allows remote attackers to affect availability, related to XML Digital Signature and unspecified APIs.  NOTE: the previous information was obtained from the February 2011 CPU.  Oracle has not commented on claims from a downstream vendor that this issue involves the replacement of the "XML DSig Transform or C14N algorithm implementations."