Healthcare has become the most targeted sector for cyberattacks globally. In 2024, the average cost of a healthcare data breach reached $9.77 million — nearly double the cross-industry average. Hospitals, clinics, and health systems are not just custodians of sensitive personal data; they run life-critical infrastructure where a system failure can directly harm patients. Understanding the threat landscape and building a credible defence is no longer optional for healthcare IT leaders.
Why Healthcare Is a Top Target
Three factors make healthcare uniquely attractive to threat actors.
Data value. A single electronic health record can sell for many times the value of a credit card on dark web markets. Records contain names, dates of birth, insurance identifiers, and Social Security numbers — information that cannot simply be cancelled like a payment card. This makes healthcare data a long-term asset for identity fraud and targeted phishing.
Operational criticality. Hospitals cannot simply take systems offline and wait out an attack. Clinical workflows depend on EHR access, imaging systems, laboratory results, and medication dispensing. Threat actors exploit this dependency, knowing that the pressure to restore operations quickly can lead organisations to pay ransoms or accept shortcuts during recovery.
Patching challenges. Healthcare environments contain a mix of modern cloud platforms, legacy clinical applications running on outdated operating systems, and networked medical devices that cannot easily receive security updates. This patchwork creates exploitable gaps that well-resourced attackers actively seek.
The Healthcare Threat Landscape
Ransomware
Ransomware remains the dominant threat in healthcare. Attacks typically encrypt clinical systems, disrupt EHR access, and increasingly involve data exfiltration before encryption — so that attackers can threaten to publish sensitive patient records even if the organisation restores from backups. Ransomware groups have demonstrated a willingness to target hospitals during peak operational periods, including during public health emergencies.
Phishing and Business Email Compromise
Phishing is the entry point for the majority of healthcare breaches. Attackers craft convincing emails mimicking payroll systems, HR platforms, or clinical software vendors. Credential harvesting gives attackers legitimate access to internal systems, enabling them to move laterally over weeks before deploying ransomware or exfiltrating data. Business email compromise — where attackers impersonate executives or vendors to redirect payments — is a growing concern for healthcare finance teams.
Insider Threats
Insider threats in healthcare take two forms: malicious insiders who abuse access to patient records (motivated by curiosity, financial gain, or grievance) and negligent insiders who inadvertently expose data through misconfigured systems, lost devices, or falling victim to social engineering. Both categories account for a significant portion of HIPAA breach reports annually.
Medical Device Vulnerabilities
The internet of medical things (IoMT) introduces thousands of network-connected devices — infusion pumps, patient monitors, imaging equipment, ventilators — many running legacy operating systems with unpatched vulnerabilities. These devices are rarely included in standard vulnerability management programmes, yet they sit on clinical networks with access to patient data and life-critical functions.
The Hospital Attack Surface
A modern hospital has an extraordinarily wide attack surface.
Electronic Health Records (EHR). The EHR is the central repository of patient data and the system most targeted in credential-based attacks. Misconfigured access controls, weak password policies, and failure to disable accounts for departed staff are common entry points.
Picture Archiving and Communication Systems (PACS). PACS stores diagnostic imaging and is frequently less well-secured than the EHR. Vulnerabilities in DICOM implementations have been widely documented, and PACS servers are often accessible from broader network segments than their sensitivity warrants.
Medical devices. As discussed above, connected clinical devices represent an often-unmanaged attack surface with limited patching options.
Email. Clinical staff are frequent targets of phishing. Without robust email filtering, multi-factor authentication, and user awareness training, email remains an easy initial access vector.
Remote access. The expansion of remote working has led many healthcare organisations to expose VPN concentrators, remote desktop gateways, and web-based clinical portals to the internet. Vulnerabilities in VPN software and weak authentication on remote access systems are regularly exploited.
A Layered Defence Framework
No single control eliminates cyber risk. Effective healthcare cybersecurity requires defence in depth — multiple overlapping controls so that the failure of any one layer does not lead to a catastrophic breach.
Perimeter controls include firewalls, intrusion detection and prevention systems, and email security gateways. These filter known threats and reduce the volume of malicious traffic reaching internal systems.
Identity and access management enforces least-privilege access, requires multi-factor authentication for all privileged accounts and remote access, and automates the removal of access when staff leave or change roles.
Endpoint protection deploys endpoint detection and response (EDR) tools that can detect and contain threats on workstations and servers even when perimeter controls are bypassed.
Network segmentation isolates clinical networks, administrative networks, guest networks, and medical device networks so that a compromise in one segment cannot freely spread to others.
Data protection controls include encryption at rest and in transit, data loss prevention tools, and controls on removable media.
Monitoring and logging ensures that security events are captured, centralised in a SIEM, and reviewed by analysts who can identify and respond to anomalous behaviour.
Backup and recovery maintains offline, tested backups of critical systems so that ransomware attacks can be recovered from without paying a ransom.
Security Team Structure
Effective healthcare cybersecurity requires dedicated resources. A mature security function typically includes a CISO with clinical credibility and executive access, a security operations team (internal or outsourced) providing continuous monitoring, an identity management team, and a risk and compliance function that maintains HIPAA documentation and manages vendor risk.
Smaller organisations that cannot staff all these capabilities internally should consider managed security service providers (MSSPs) with healthcare sector experience.
Incident Response Basics
Every healthcare organisation needs a documented, tested incident response plan before an attack occurs. At minimum, the plan should define who is responsible for declaring a security incident, how clinical operations will continue during system downtime (downtime procedures), when and how to notify regulators and patients, and how evidence will be preserved for forensic investigation.
Tabletop exercises that simulate realistic attack scenarios — a ransomware outbreak affecting the EHR, a phishing attack compromising executive credentials — are the most effective way to test whether plans will work under pressure.
Compliance Considerations
HIPAA's Security Rule sets minimum requirements for protecting electronic protected health information (ePHI). Meeting HIPAA requirements is a floor, not a ceiling — the regulation was written before many modern threats existed. Organisations should treat HIPAA compliance as one component of a broader security programme, not as its entirety.
Other relevant frameworks include the NIST Cybersecurity Framework, the HHS 405(d) Health Industry Cybersecurity Practices publication, and, for organisations operating internationally, ISO 27001 and relevant local data protection regulations.
FZ Consulting LLP helps healthcare organisations build and mature their cybersecurity programmes, from risk assessments to technical security reviews and incident response planning. Contact our team to discuss your organisation's security posture.