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Java 7 Update 10 and earlier Java 7 versions contain an unspecified vulnerability that can allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.
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We are currently unaware of a practical solution to this problem. Please consider the following workarounds:
Disable Java in web browsers

Круто!

UPD. Оракл багу зафиксил: http://www.oracle.com/technetwork/java/javase/7u11-relnotes-1896856.html