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Java Applet Reflection Type Confusion Remote Code Execution

This module abuses Java Reflection to generate a Type Confusion, due to a weak access control when setting final fields on static classes, and run code outside of the Java Sandbox. The vulnerability affects Java version 7u17 and earlier. This exploit bypasses click-to-play throw a specially crafted JNLP file. This bypass is applied mainly to IE, when Java Web Start can be launched automatically throw the ActiveX control. Otherwise the applet is launched without click-to-play bypass.

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Module Name



  • Jeroen Frijters
  • juan vazquez <juan.vazquez [at]>



  • Generic (Java Payload)
  • Windows x86 (Native Payload)
  • Mac OS X x86 (Native Payload)
  • Linux x86 (Native Payload)


  • java
  • linux
  • osx
  • windows


  • java
  • x86



Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use exploit/multi/browser/java_jre17_reflection_types msf exploit(java_jre17_reflection_types) > show targets ...targets... msf exploit(java_jre17_reflection_types) > set TARGET <target-id> msf exploit(java_jre17_reflection_types) > show options and set options... msf exploit(java_jre17_reflection_types) > exploit

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