BOSTON (Reuters) - Oracle Corp has replaced its chief financial officer less than three years after he joined the company, tapping President Safra Catz to assume the duties of CFO.

The company said on Monday that CFO Jeffrey Epstein resigned, but did not give a reason. Epstein, who joined Oracle in September 2008, could not immediately be reached for comment.

Catz, who has been a president of Oracle since 2004, concurrently served as chief financial officer from November 2005 to September 2008.

Oracle shares fell 1.1 percent to $34.40 in extended trade.

(Reporting by Jim Finkle; editing by Carol Bishopric)