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Medical device maker Masimo Corp. is investigating a cyberattack that has impacted its manufacturing facilities and limited its ability to fulfill orders, the company said in a Tuesday filing with the Securities and Exchange Commission.

The Irvine, California–based maker of patient monitoring devices said it discovered unauthorized activity on its network on April 27. The attack has temporarily interfered with its ability to process, fulfill and ship customer orders in a timely manner, the company said.

Masimo told the SEC that it immediately took steps to contain the incident and isolate the affected systems. The company said it has been working with third-party incident response experts to assess, mitigate and remediate the attack.

The company has also notified law-enforcement authorities and is coordinating its response with them.

Masimo’s filing says it is working diligently to bring the affected portions of its network back online and restore normal business operations. The incident involved the company’s on-premises systems, and there is no current evidence the attack impacted the company’s cloud-based network.

CEO Katie Szyman said in a quarterly earnings call that the incident disrupted the company’s website and several of its computer systems, but she added that, as of now, the incident would not change the company’s financial guidance.

However, the company cautioned in the filing that it has not yet determined the “full scope, nature and impact” of the incident.

The company said non-GAAP earnings rose 56% from the year-ago period to $1.36 a share during the first fiscal quarter, which ended on March 29. Non-GAAP revenue was $371 million during the quarter.

Masimo is forecasting revenue of between $1.5 billion and $1.53 billion for fiscal 2025.

The company is also selling its Sound United consumer audio business to Harman International, a subsidiary of Samsung Electronics Co., for $350 million in cash, subject to certain adjustments. The company had previously announced a strategic review of that unit in order to focus on its core healthcare business.

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