Monitoring Interrupted: Masimo's Cyber Breach and the Risks of Medical Tech

On April 27, 2025, medical device maker Masimo Corporation faced a significant cyberattack that disrupted its manufacturing operations and hindered its ability to fulfill customer orders. Known for its life-saving patient monitoring technologies, Masimo’s cyberattack and sudden operational paralysis serve as a stark reminder that not even healthcare tech is immune to cyber threats. This event highlights a growing trend: as medical devices become smarter and more connected, they also become more vulnerable.

A Pulse Stopped: What Happened at Masimo?

Masimo, headquartered in Irvine, California, discovered unauthorized activity within its on-premise network. The attack forced the company to isolate the affected systems to contain the damage. Manufacturing facilities were hit hard, with operations running at less than normal levels, delaying order fulfillment for critical medical monitoring devices. Despite the setbacks, Masimo assured that its cloud-based systems remained untouched, providing some relief amidst the chaos.

Interestingly, the incident occurred just as the company was reporting strong earnings for the first fiscal quarter of 2025. Non-GAAP revenue reached $371 million, a 10% increase from the previous year. Yet, the cyberattack cast a shadow over its financial success, highlighting the disruptive power of cyber incidents even for thriving businesses.

Incident Response in Action

The company’s quick response played a crucial role in minimizing the impact. Masimo promptly initiated incident response protocols, isolating compromised systems and collaborating with third-party cybersecurity experts to assess and remediate the situation. The company also coordinated with law enforcement to track the perpetrators and prevent further damage. Although the investigation is ongoing, Masimo’s swift containment efforts illustrate the importance of having a well-prepared incident response plan.

Masimo’s response is a textbook example of effective incident management. According to industry best practices, the first 24 hours of a breach are crucial. Swift containment prevents the attack from spreading, while external cybersecurity experts bring additional expertise to mitigate risks. Law enforcement involvement is also a strategic move, ensuring the attack is officially documented and possibly aiding in the capture of the perpetrators.

The Bigger Picture: Cyber Threats in Healthcare

Masimo’s experience is not an isolated event. The healthcare industry has become an increasingly attractive target for cybercriminals. In 2023 alone, 595 hacking incidents were reported to the U.S. Department of Health and Human Services, averaging 1.6 breaches per day. Why? Because healthcare data is incredibly valuable, medical records can sell for up to ten times the price of a stolen credit card number on the dark web.

Medical devices are also vulnerable. Last year, research from Forescout Technologies revealed 162 security vulnerabilities across connected medical devices like DICOM workstations and PACS systems, potentially exposing sensitive patient data and disrupting operations. The Masimo breach is just the latest in a long line of alarming cyber events in the healthcare sector.

To make matters worse, the interconnected nature of medical devices, sometimes called the Internet of Medical Things (IoMT) increases the attack surface. A vulnerability in just one device can provide hackers with a gateway to the entire network, potentially compromising patient data and disrupting clinical operations.

What Can We Learn? Key Takeaways for Cybersecurity

Masimo’s cyberattack underlines several key lessons:

On-Premises Vulnerabilities: Unlike cloud-based systems, on-premises networks are more prone to breaches if not properly secured. Masimo’s cloud systems were unaffected, highlighting the robustness of cloud security when managed effectively.

Incident Response is Critical: Quick isolation and third-party support limited the damage. Every organization should have an incident response plan in place before an attack happens.

Law Enforcement Coordination Matters: Cybercrime is global, and immediate coordination with law enforcement can help track perpetrators and mitigate risk.

Visibility is Vital: Early detection of unauthorized activity can prevent extensive damage. Tools like intrusion detection systems (IDS) and regular network monitoring are essential.

Supply Chain Awareness: Cyberattacks that disrupt manufacturing can lead to delays across global supply chains, highlighting the need for robust supplier risk management.

Cybersecurity Tips to Prevent Healthcare Breaches

Preventing cyber incidents like the one experienced by Masimo requires proactive measures. Here are some tips:

Adopt Zero Trust Architecture: Assume every user and device is a potential threat until verified. Limit access to only those who need it.

Regular Software Updates: Ensure all systems, especially medical devices, are up to date with the latest security patches.

Employee Training: Most breaches start with phishing. Training staff to recognize suspicious emails can significantly reduce risk.

Segment Networks: Isolate critical systems from broader networks to limit an attack’s reach.

Backup Critical Data: Ensure frequent, encrypted backups are stored separately from main systems.

Test Incident Response Plans: Regular drills help teams respond swiftly during real incidents.

Strengthen Vendor Security: Assess third-party vendors for cybersecurity vulnerabilities since supply chain attacks are increasingly common.

Looking Ahead: The Cost of Cyber Vigilance

Masimo’s experience underscores the cost of cyber vigilance. Manufacturing delays can ripple through the supply chain, affecting healthcare facilities that depend on reliable patient monitoring. Financial losses aside, the potential for compromised patient data adds another layer of concern.

The healthcare sector’s dependence on connected devices will only grow, making cybersecurity an essential investment. Building a robust security posture, through continuous monitoring, employee training, and strong incident response, can be the difference between a minor disruption and a catastrophic breach.

Masimo’s ongoing recovery serves as a reminder: in healthcare, cybersecurity is as crucial as the technology that saves lives. In this age of digital transformation, protecting patient data and ensuring the resilience of life-saving technologies should be non-negotiable.