According to some reports by technical publishers, the instructions needed to exploit the security flaw are readily available on the Internet.

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The agent was reportedly arrested with a large sum of money, technical devices and written instructions for the agent he had tried to recruit.

BBC: 'CIA agent intercepted' in Moscow by FSB

The U.S. diplomat had "special technical devices, written instructions for the Russian citizen being recruited, a large sum of cash and means of changing his appearance, " state news agency RIA-Novosti quoted the FSB as saying earlier Tuesday.

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At the time of his detention, Mr Fogle was wearing a blond wig and reportedly carrying a large sum of money, as well as technical devices and written instructions for the Russian agent he had tried to recruit.

BBC: Moscow holds talks with US ambassador over spy scandal