The Gloucester hooker, who was sent off during Gloucester’s 31-25 defeat at The Rec on March 1, pleaded not guilty and will miss Gloucester’s next five matches as a result of the ban.
Should he be picked, he will only return for the Cherry and Whites’ final match of the regular-season against Exeter on April 22.
At the same hearing, lock Lua Lokotui, who tackled Attawood at the same time but received no yellow or red card, pleaded not guilty to the same charge and he was found not guilty.
The 33-year-old Tongan is free to play.
Watch the video of the incident below.