Officers were called to a property in Fore Street, Chudleigh, on Monday evening.
The injured 20-year-old, who was taken to Plymouth's Derriford Hospital after the assault, has since been discharged.
Devon and Cornwall Police said a 25-year-old man has been arrested and believe the assault was an "isolated incident".

Scottish actor Capaldi is appearing in his final series as the Doctor.
He has said whoever replaces him - whether a man or woman - will be "wonderful".
Inverness-born Gillan, who played Amy Pond alongside Matt Smith's Doctor, said she would respect whatever decision was made on the role.
A man has been chosen as Capaldi's successor, according to newspaper reports.
Speaking at the Los Angeles premiere of her latest film, Guardians Of The Galaxy Vol 2, Gillan said: "It's OK, maybe next time.
"I trust the BBC and their choices and they haven't failed us yet with the Doctor.
"But it would be cool to see a woman in the role one day because a woman could absolutely play that role."
The BBC said no casting decisions have been made.
In Guardians of the Galaxy Vol 2, Gillan plays blue-skinned space pirate Nebula.

"Costs have got out of control, we need costs to come right down," he told BBC 5 live's Wake Up to Money programme.
Lord Browne said companies would have to "slim down", warning "there will be some companies that go to the wall".
The warning from Lord Browne, who led BP for 12 years, comes amid fears the industry is in crisis.
A barrel of Brent crude has more than halved in price since its peak of $115 last summer. On Tuesday, the price stood at $57 a barrel.
Last month, the chairman of the independent explorers' association Brindex told the BBC the industry was "close to collapse".
Robin Allan claimed almost no new projects in the North Sea were profitable with oil below $60 a barrel.
In recent weeks hundreds of North Sea jobs have been cut by oil firms, including BP and Talisman Sinopec.
The chancellor has said he will look at new measures to support the industry in his next Budget in March.
Both industry leaders and the Scottish government are calling for taxes to be cut further as a matter of urgency to help the sector deal with falling oil prices and higher costs.
Unions have also raised safety concerns over the number of job cuts being made in the industry.
A man has been arrested on suspicion of attempted murder after another man was found with stab wounds in a Devon town.
[NEXT_CONCEPT]
Former Doctor Who companion Karen Gillan has said an actress succeeding Peter Capaldi in the lead role of the long-running TV series "would be cool".
[NEXT_CONCEPT]
Former BP chief executive Lord Browne has warned North Sea oil operators' costs must fall in order for them to compete globally.