Smeg UK, a premium Italian brand, said it had a team of investigators working on the issue.
The company had urged its customers to be “patient” while they work to resolve the problem.
It is understood the cyber attack occurred earlier this week.
A statement from the company said: “Unfortunately we have been the victim of a targeted cyber attack and as such have taken immediate steps to totally shut our systems down to protect our customers and ourselves.
“At this time we have no reason to believe any of our customer information has been exposed.
“We have a specialist team working around the clock to resolve this issue and get us operational ASAP.
“We will update our social media feeds as soon as this is the case. We thank you for your patience at this time.”
The company posted an online alert to customers on September 12.
Smeg, which brands itself as “technology with style”, is known for its Italian-inspired kitchen appliances.
The company offers an array of products from toasters and kettles to ovens and fridges.
Smeg UK was set up in 1989 and is based in Abingdon, Oxfordshire.
The Italian company supplies more than 750 products including hobs, range cookers, extractor hoods and washing machines.
Its British subsidiary also offers Smeg Service, an award-winning after sales and service division.
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