The Dow could suffer a 2,400 point blow at any time, warns Wall Street legend Byron Wien

A correction hasn't shaken the historic market rally yet, but Wall Street legend Byron Wien says it's "definitely" coming.

"A 10 percent correction could come along at any time, and particularly when the market has done as well as it's done. I mean basically it's gone straight up since Donald Trump was elected," Wien warned on Wednesday on CNBC's "Trading Nation."

If a correction of that magnitude were to hit today, the Dow would suffer a 2,400 point blow.

Wien, vice chairman of Blackstone's Private Wealth Solutions group, gives a 50 percent probability for a deep sell-off by year-end. He's been in the correction camp all year — and says he's concerned it hasn't happened yet.

"The market is overbought and investors are optimistic," said Wien. "An overbought market with optimistic investors is vulnerable, and the question is what triggers the vulnerability?"

It's not an easy answer, according to Wien. His hunch is a geopolitical development, such as a major conflict with North Korea, could trigger a correction by causing instability. But it's also possible the rally could just pause on its own.

"Maybe the market just spontaneously begins to fade," added Wien, who believes the markets are already borrowing performance from 2018.

Regardless of how it materializes, Wien doesn't see it as a sign that a bear market is around the corner. He believes stocks would bounce back quickly, and ultimately end 2018 higher than current levels.

"Fundamentals are very strong," Wien said.

The Dow, which is up 32 percent since Trump was elected, saw its second negative session in a row on Wednesday after falling about 40 points. It closed at 24,140.

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Trading Nation is a multimedia financial news program that shows investors and traders how to use the news of the day to their advantage. This is where experts from across the financial world – including macro strategists, technical analysts, stock-pickers, and traders who specialize in options, currencies, and fixed income – come together to find the best ways to capitalize on recent developments in the market. Trading Nation: Where headlines become opportunities.

Michael Santoli

Michael Santoli joined CNBC in October 2015 as a Senior Markets Commentator, based at the network's Global Headquarters in Englewood Cliffs, N.J.  Santoli brings his extensive markets expertise to CNBC's Business Day programming, with a regular appearance on CNBC's “Closing Bell (M-F, 3PM-5PM ET).   In addition, he contributes to CNBCand CNBC PRO, writing regular articles and creating original digital videos.

Previously, Santoli was a Senior Columnist at Yahoo Finance, where he wrote analysis and commentary on the stock market, corporate news and the economy. He also appeared on Yahoo Finance video programs, where he offered insights on the most important business stories of the day, and was a regular contributor to CNBC and other networks.

Follow Michael Santoli on Twitter @michaelsantoli

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