The IcedTea-Web plugin before 1.2.1 does not properly handle NPVariant NPStrings without NUL terminators, which allows remote attackers to cause a denial of service (crash), obtain sensitive information from memory, or execute arbitrary code via a crafted Java applet.
https://bugzilla.redhat.com/show_bug.cgi?id=841345
http://www.ubuntu.com/usn/USN-1521-1
http://security.gentoo.org/glsa/glsa-201406-32.xml
http://secunia.com/advisories/50089
http://rhn.redhat.com/errata/RHSA-2012-1132.html
http://lists.opensuse.org/opensuse-updates/2013-06/msg00101.html
http://lists.opensuse.org/opensuse-updates/2013-06/msg00030.html
http://lists.opensuse.org/opensuse-updates/2013-05/msg00032.html
http://lists.opensuse.org/opensuse-security-announce/2013-07/msg00013.html
http://lists.opensuse.org/opensuse-security-announce/2013-05/msg00020.html
http://lists.opensuse.org/opensuse-security-announce/2012-08/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2012-08/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2012-08/msg00003.html
http://icedtea.classpath.org/hg/release/icedtea-web-1.2/file/icedtea-web-1.2.1/NEWS