Sujeet, a 25-year-old man from Pratapgarh in Uttar Pradesh tried to enter the airforce station at around 11 pm yesterday.
As he ignored the warnings by security personnel to stop, he was shot in the left leg in order to immobilise him, SHO of Sahibabad police station Rakesh Kumar Singh said.
Speaking on condition of anonymity, an official said there was an IB alert about a possible attack by some terrorist outfits on the airbase.
The security has been beefed up at the airbase.