Bitcoin dropped sharply below $86,000 on Monday, December 1, 2025, amid turmoil caused by a security breach at DeFi firm Yearn Finance impacting its yETH pool. This exploit allowed an attacker to mint an unlimited number of yETH tokens, undermining market confidence. Despite growing optimism over an anticipated Federal Reserve rate cut, the crypto sector experienced significant volatility as investors reacted to the breach.

Yearn Finance Breach Drives Crypto Market Decline

Bitcoin’s price slid 6.6% to $85,822 by 08:41 ET (13:41 GMT), reaching a 24-hour low of $84,930 following the news. The cryptocurrency had already declined over 16% through November. Yearn Finance revealed it was investigating an incident in its yETH liquidity pool, where an exploit enabled the creation of an excessive supply of yETH tokens “out of thin air.” This token inflation flooded liquidity and eroded trust in the underlying assets supporting the pool.

The fallout rippled through digital asset markets, dragging down Ethereum nearly 8% to $2,810.44 and XRP 8.5% to $2.01. Other major altcoins, including Solana, Cardano, and Polygon, recorded losses ranging between 9% and 12%. Meme tokens fared worse with Dogecoin down over 1% and $TRUMP retreating 6.6% amid widespread sell-offs driven by risk aversion.

Fed Rate Cut Optimism Counterbalanced by Crypto Risk

Despite the crypto market disruption, expectations for monetary easing in the U.S. remain elevated. Recent data showing weaker economic growth and moderating inflation led traders to assign an 87% probability to a 25-basis-point Federal Reserve rate cut at the December 9–10 Federal Open Market Committee meeting, a marked increase from about 40% just a week prior.

However, the Yearn Finance breach tempered this positive sentiment. Adding to the policy uncertainty, former U.S. President Donald Trump indicated he has selected a nominee for Fed Chair but withheld the name. Market speculation centers on former White House economic adviser Kevin Hassett, viewed as dovish on monetary policy, which has further influenced investor expectations ahead of the meeting.

MicroStrategy Secures Dividend Reserve, Adjusts Bitcoin Forecast

MicroStrategy responded to the heightened market volatility on Monday by announcing a $1.44 billion cash reserve created from recent common stock sales. This reserve is designed to cover preferred-stock dividend payments for roughly 21 months, with intentions to expand coverage to 24 months or more, reassuring investors about dividend stability amid Bitcoin’s decline.

Following Bitcoin’s drop near $86,000—substantially below MicroStrategy’s previous year-end target of $150,000—the firm revised its net income outlook, projecting results between a $5.5 billion loss and a $6.3 billion profit. This projection is based on a new Bitcoin price range of $85,000 to $110,000. The company also reduced its Bitcoin yield target to 22%–26%, down from an earlier estimate of 30%. Correspondingly, MicroStrategy lowered its anticipated full-year Bitcoin gains to $8.4 billion to $12.8 billion from a prior $20 billion forecast.

Despite the pessimistic forecast, MicroStrategy disclosed the purchase of 130 additional Bitcoins for $11.7 million, averaging about $89,860 per coin. Its holdings now total 650,000 Bitcoins, purchased at an aggregate cost of $48.38 billion and an average price of $74,436 per token.

Market Implications Following the Yearn Finance Breach

Bitcoin’s fall under $86,000 on December 1 displays the lingering vulnerability within cryptocurrency markets to technical breaches. While market participants maintain strong hope for Federal Reserve easing, the latest exploit underscores ongoing risks posed by DeFi security lapses and regulatory ambiguity. Highly correlated digital assets experienced significant losses, reflecting heightened risk-off sentiment among investors. MicroStrategy’s strategic cash reserve and moderated outlook illustrate efforts to mitigate effects from this sudden volatility. The crypto market remains alert to further developments as the Fed’s December meeting approaches.