Dave Winfield's late header preserved Aldershot's unbeaten away record. Winfield rose to convert Joe Grant's cross with three minutes left when Cambridge looked set for victory after Scott Rendell's finish from six yards.
Rendell was denied a second by Shots keeper Nikki Bull, Leo Fortune-West headed on to the crossbar and Bull tipped away a Courtney Pitt effort.
The Shots salvaged their point before Us substitute Marvin Robinson was sent off for two bookings in two minutes.
Cambridge Utd: Potter, Peters, Albrighton, Morrison, Gleeson, Convery, Reed (Stephen Smith 83), Wolleaston (Quinton 63), Pitt, Rendell (Robinson 78), Fortune-West.
Subs Not Used: Hoyte, Willmott.
Sent Off: Robinson (90).
Booked: Gleeson, Robinson.
Goals: Rendell 21.
Aldershot: Bull, Gier (Smith 54), Day, Winfield, Straker, Soares, Chalmers, Davies (Joe Grant 67), Harding, John Grant, Elvins.
Subs Not Used: Jaimez-Ruiz, Newman, Hudson.
Booked: Elvins, Joe Grant.
Goals: Winfield 87.
Att: 3,610
Ref: G Sutton (Lincolnshire).
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