<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM TUT SYSTEMS,
INC. AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 26,934
<SECURITIES> 107,717
<RECEIVABLES> 15,924
<ALLOWANCES> (537)
<INVENTORY> 15,353
<CURRENT-ASSETS> 170,639
<PP&E> 10,461
<DEPRECIATION> (2,857)
<TOTAL-ASSETS> 245,863
<CURRENT-LIABILITIES> 13,973
<BONDS> 0
0
0
<COMMON> 15
<OTHER-SE> 229,443
<TOTAL-LIABILITY-AND-EQUITY> 245,863
<SALES> 20,345
<TOTAL-REVENUES> 21,014
<CGS> 11,234
<TOTAL-COSTS> 11,234
<OTHER-EXPENSES> 13,302
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> (139)
<INCOME-PRETAX> (1,180)
<INCOME-TAX> 0
<INCOME-CONTINUING> (1,180)
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (1,180)
<EPS-BASIC> (0.08)
<EPS-DILUTED> (0.08)
</TABLE>