The incident happened at about 03:00 on Saturday in Doon Way, Kirkintilloch.
It is understood that a 20-year-old man was taken to Glasgow Royal Infirmary for treatment.
Alloway Drive, which is near the scene of the assault, was closed between Doon Road and Burns Drive while investigations were carried out.
It has since reopened.

The airport said its £16bn plan for expansion included addressing flooding from Thames tributaries that burst their banks early in 2014.
The Environment Agency, which has plans to meet Heathrow bosses in the next week, said it was "very encouraged".
"I believe this scheme will happen," said spokesman David Murphy.
In February last year, flooding affected homes and businesses along the river in Berkshire, Surrey and the London boroughs of Kingston and Richmond.
The River Thames defence scheme involves reducing the flood risk between Datchet and Teddington by building a flood channel and improving three weirs.
The government announced in its autumn statement it would contribute £220m towards the scheme, with businesses and utility companies being asked to chip in.
Leader of Surrey County Council David Hodge has said Heathrow would be one of those asked to contribute.
Heathrow said its expansion plan included a "once-in-a-generation" opportunity to address issues like flooding from nearby rivers, particularly the Colne and Wraysbury.
"We will work and support the Environment Agency and local authorities in developing better flood alleviation schemes to protect homes and property located away from the airport."
The Airports Commission is currently considering three options for expanding airport provision in south-east England.
It is due to make its final recommendation to the government in the summer.
Mr Murphy, Environment Agency executive for the River Thames scheme, said: "One of the key factors of expansion at Heathrow will be to manage water associated with that development.
"This whole area has many rivers many lakes and therefore water management is incredibly important because of the potential for flooding which we saw last year."

The Swiss, playing his first match in two months, won the first set but succumbed to the German in the second-set tie-break having had match point.
"It's always special to play a close friend like Roger on grass, always lots of emotion," said the world 302.
"I saved a match point so was able to play more freely after that."
He added: "I even shocked myself."
It was Haas' fourth victory in 17 meetings against the former world number one.
The 35-year-old, who has started his build-up to Wimbledon, had not played since winning the Miami Open against Rafael Nadal in April and missed the entire clay court season.
It was only the world number five's second defeat of the 2017 season.

The 22-year-old, who scored 20 goals last season, has started in both of the Baggies' league games this season.
"We have no interest in selling Saido which is what I have told Spurs chairman Daniel Levy," said Albion chairman Jeremy Peace.
"I know we are living in an age where no club can say 'never' about the possibility of selling a player."
He added: "However, the prospect of selling Saido is simply not on our agenda.
"We are going forward with Saido very much in our plans and still striving to add players to improve the balance of our squad."
The Daily Telegraph reports the offer from Spurs is worth £15m, with Albion valuing Berahino at £25m.
In February, Baggies boss Tony Pulis said he put Berahino "on the naughty step" after the forward said that "he hoped to move on to bigger things".
Berahino, with 14 strikes, was the third top English scorer in the Premier League last season behind Spurs' Harry Kane and QPR striker Charlie Austin.
Police are investigating after a man was assaulted in a street in East Dunbartonshire.
[NEXT_CONCEPT]
Heathrow airport could be among businesses contributing to a £300m River Thames defence scheme if it gets the go-ahead to expand.
[NEXT_CONCEPT]
Seven-time Wimbledon champion Roger Federer was beaten 2-6 7-6 (10-8) 6-4 by 39-year-old Tommy Haas on grass at the Stuttgart Open.
[NEXT_CONCEPT]
West Brom have rejected an offer from Tottenham for England Under-21 striker Saido Berahino.