A cyberattack at medical-device maker Boston Scientific has triggered a global outage of key operational technology, leaving the company unable to fill orders. The company, which reported $20 billion in revenue in 2025, said it doesn't know when it will be able to restore systems.

Boston Scientific detected the attack Tuesday, according to a filing with the U.S. Securities and Exchange Commission. "The incident has caused, and is expected to continue to cause, disruptions and limitations of access to certain of the Company's information systems and business applications that support aspects of the Company's operations," the filing said. A spokeswoman for Boston Scientific declined to add anything beyond the SEC filing

Shares were down nearly 4.2% in early trading Wednesday, to $47.78.

The outage hits Boston Scientific at a precarious moment. Just last month, setbacks with two heart-disease products knocked the stock and led executives to slash full-year forecasts, trimming sales growth expectations by up to 2 percentage points and cutting adjusted earnings-per-share targets by more than 10 cents, at $3.28 to $3.32.

Boston Scientific said in July it planned to lay off staff as part of a new, three-year restructuring plan that includes transferring some production lines to different facilities.