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US Air Force
"I'm very pessimistic on weapons of mass destruction generally although I don't think that nuclear probably is quite as likely as either primarily biological and maybe cyber," Buffett said during $4 on Saturday.
"I don't know that much about cyber, but I do think that's the number one problem with mankind."
Last year, Buffett said $4 - cyber, nuclear, biological and chemical attacks - posed a major threat to the economic well-being of Berkshire shareholders.
In 2015, Berkshire made a bet that could profit from increased cyber breaches. Berkshire Hathaway Specialty Insurance $4 two insurance policies that cover cyber liability and the costs incurred to respond to a data breach or threat.
Similarly, AIG launched a product earlier this year that covers expenses arising from online bullying and extortion, according to $4.
Buffett's remarks came a day after thousands of documents were $4 Emmanuel Macron, before the second round of voting on Sunday. The incident brought flashbacks of the hack into Hillary Clinton campaign chairman John Podesta's emails before last year's election.