If your format is consistent then you could just do a simple match after the final 'V' and before the '>' for digits and dots e.g

my $s = "CMTS_V03.01.01.41, <<HW_REV: 1.3; VENDOR: ARRIS; BOOTR: V00.0
+1.00>>";

my($vn) = $s =~ m{V((?:\d+\.?)+)>};

print "version number: $vn";

__output__

version number: 00.01.00
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See. perlre for more information on regular expressions in perl.