The Java Runtime Environment (JRE) component in Oracle Java SE 7 Update 17 and earlier, and OpenJDK 6 and 7, allows remote attackers to execute arbitrary code via unspecified vectors involving reflection, Libraries, "improper toString calls," and the JDBC driver manager, as demonstrated by James Forshaw during a Pwn2Own competition at CanSecWest 2013.
http://h30499.www3.hp.com/t5/HP-Security-Research-Blog/Pwn2Own-2013/ba-p/5981157
http://lists.opensuse.org/opensuse-security-announce/2013-05/msg00007.html
http://lists.opensuse.org/opensuse-updates/2013-05/msg00017.html
http://lists.opensuse.org/opensuse-updates/2013-06/msg00099.html
http://rhn.redhat.com/errata/RHSA-2013-0752.html
http://rhn.redhat.com/errata/RHSA-2013-0757.html
https://bugzilla.redhat.com/show_bug.cgi?id=920247
http://security.gentoo.org/glsa/glsa-201406-32.xml
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16511
https://twitter.com/thezdi/status/309425888188043264
https://wiki.mageia.org/en/Support/Advisories/MGASA-2013-0124
https://wiki.mageia.org/en/Support/Advisories/MGASA-2013-0130
http://www.mandriva.com/security/advisories?name=MDVSA-2013:145
http://www.mandriva.com/security/advisories?name=MDVSA-2013:161
http://www.oracle.com/technetwork/topics/security/javacpuapr2013-1928497.html