<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>
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> SEP-30-2000
<CASH> 14,268
<SECURITIES> 118,533
<RECEIVABLES> 31,186
<ALLOWANCES> (543)
<INVENTORY> 22,267
<CURRENT-ASSETS> 188,741
<PP&E> 14,582
<DEPRECIATION> (3,946)
<TOTAL-ASSETS> 259,393
<CURRENT-LIABILITIES> 24,124
<BONDS> 0
0
0
<COMMON> 16
<OTHER-SE> 233,248
<TOTAL-LIABILITY-AND-EQUITY> 259,393
<SALES> 66,055
<TOTAL-REVENUES> 66,055
<CGS> 35,435
<TOTAL-COSTS> 35,435
<OTHER-EXPENSES> 41,651
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 459
<INCOME-PRETAX> (6,026)
<INCOME-TAX> 1
<INCOME-CONTINUING> (6,027)
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (6,027)
<EPS-BASIC> (0.42)
<EPS-DILUTED> (0.42)
</TABLE>