The incident took place in London Road, near Little Close, between 10.30pm and 11.30pm on Sunday, June 9.
The victim was approached by three men wearing scarves and hooded tops and attacked in a pathway that led to rear gardens.
During the serious assault the man was slashed with a Stanley knife, punched and kicked.
Muslim woman left in tears after Kettering McDonald's wrongly puts bacon in burger
Corby man Thomas Hall, 21, who had severe mental health issues, had taken spice before 'wholly unacceptable' delay in CPR
Eight pumps tackling large fire at Corby recycling centre
Remembering the drought of 1976 across Northamptonshire in pictures from the archive
North Northamptonshire villages 'in danger of being stranded' as bus services set to be cancelled
Anyone who saw the incident or has information about it should call Northamptonshire Police on 101, or Crimestoppers in confidence on 0800 555111.