are there any haxorware programs for a Motorola Surfboard Sb6120?
No, and none will be developed.
The 6120 uses a TI chipset, called PUMA
Haxorware is based on the BroadCom chipset.
for a SBG6580 has BCM3380 chipset haxorware programs exist ???
No Firmware under the label of Haxorware exists for the 6580.
There is MOTOROLA Firmware used by System Engineers used to test the CMTS.