The Java Plug-in in Java SE Development Kit (JDK) and Java Runtime Environment (JRE) 6 Update 12, 11, and 10 allows user-assisted remote attackers to cause a trusted applet to run in an older JRE version, which can be used to exploit vulnerabilities in that older version, aka CR 6706490.
https://rhn.redhat.com/errata/RHSA-2009-1198.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6642
https://exchange.xforce.ibmcloud.com/vulnerabilities/49458
http://www.vupen.com/english/advisories/2010/1191
http://www.vupen.com/english/advisories/2009/3316
http://www.vupen.com/english/advisories/2009/1426
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http://www.securitytracker.com/id?1021920
http://www.securityfocus.com/bid/34240
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http://www.redhat.com/support/errata/RHSA-2009-0392.html
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http://support.apple.com/kb/HT4171
http://sunsolve.sun.com/search/document.do?assetkey=1-66-254611-1
http://security.gentoo.org/glsa/glsa-200911-02.xml
http://secunia.com/advisories/39819
http://secunia.com/advisories/37460
http://secunia.com/advisories/37386
http://secunia.com/advisories/36185
http://secunia.com/advisories/35255
http://secunia.com/advisories/35156
http://secunia.com/advisories/34496
http://marc.info/?l=bugtraq&m=124344236532162&w=2
http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2009-04/msg00001.html
http://lists.apple.com/archives/security-announce/2010//May/msg00001.html
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=c01745133