A substantial portion of financial advisers is worried about the possibility of a sharp drop for stocks in 2014, according to a CNBC poll.

The survey included 15 advisers, who are part of the 20-member CNBC Digital Financial Advisor Council. Those 20 advisers manage a total of $23 billion.

As for the 15 polled, 44 percent said they are "somewhat concerned" about a stock bubble for next year. Meanwhile, 40 percent expect a correction of at least 10 percent, and 20 percent anticipate a decline of at least 20 percent.

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The Standard & Poor's 500 Index hasn't endured a 10 percent correction in 26 months, compared to an average of every 18 months since 1945, Sam Stovall, chief equity strategist at S&P Capital IQ, wrote in a report obtained by CNNMoney.

Adviser Ed Gjertsen of Mack Investment Securities, sees the threat of a modest downturn for stocks next year.

"Given the cyclical upturn in the U.S. economy, any correction in the stock market should be shallow [10 percent or less]," he told CNBC.

"My largest concern is the continued weakness in velocity of money. We are drowning in a monetary liquidity pool."

One expert who isn't overly concerned now about a bubble in stocks is Nobel laureate economist Robert Shiller of Yale University.

"My valuation-confidence index, which measures the confidence that the market isn't overvalued, was at its all-time low right at the peak of the market in 2000, and we are not anywhere near down there," he told Barron's.

"So I don't see the same bubble-like mentality right now."

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• Greenspan: Stocks Aren't Bubbling, 'Problem Basically Is Washington'
• Shiller, Others Don't See a Stock Market Bubble