CVE-2022-4992: Dräger Infinity M540 Patient Monitor Network Message Vulnerability

Technical summary

CVE-2022-4992 is a network message handling vulnerability affecting Dräger Infinity Acute Care System and Standalone M540 patient monitors running VG4.1.1, VG4.0.3, or earlier versions, with partial impact to VG4.2. The flaw stems from insufficient validation of incoming network communications (CWE-345: Insufficient Verification of Data Authenticity). An unauthenticated, network-adjacent attacker can inject spoofed or tampered network packets to trigger multiple attack vectors: modification of device parameters (alarm thresholds, alarm states), triggering denial-of-service conditions through packet flooding, or causing unscheduled device resets that interrupt monitoring and network functionality. The CVSS 3.1 score of 8.6 (HIGH) reflects network accessibility, low attack complexity, partial confidentiality and integrity loss, and high availability impact.

Business impact

Patient monitors are foundational to clinical decision-making and continuity of care. A successful attack could result in: loss of real-time patient data visibility, delayed clinical response to patient deterioration, false or suppressed alarms leading to care gaps, unscheduled system downtime requiring manual intervention, and potential patient safety events. Medical device disruption also triggers incident response overhead, potential regulatory notification obligations, and reputational impact. Organizations relying on these monitors in ICU, acute care, or perioperative settings face elevated operational risk.

Affected systems

Dräger Infinity Acute Care System and Dräger Standalone Infinity M540 patient monitors running firmware versions VG4.1.1, VG4.0.3, or lower are directly affected. VG4.2 is noted as partially affected, indicating some exposure but likely reduced risk depending on specific build or configuration. Organizations should verify exact firmware versions deployed in their environment, as clinical deployments often retain legacy versions.

Exploitability

This vulnerability scores low on attack complexity and requires only network access—no authentication, no user interaction, no special privileges. An attacker must have network visibility to the affected devices (local network segment or compromised network path), but given typical medical device network topology, this could include internal network access or lateral movement from a compromised clinical workstation. No known public exploits are documented in CISA's KEV catalog, but the straightforward attack surface (network message injection) means exploitation is feasible for moderately capable threat actors with clinical network access.

Remediation

Verify your deployed Dräger Infinity Acute Care and M540 firmware versions and prioritize upgrade to a patched release (consult Dräger security advisories for confirmed fixed versions beyond VG4.1.1/VG4.0.3). If immediate patching is not feasible, implement network segmentation to isolate patient monitors on a dedicated, monitored VLAN with strict access controls; restrict device-to-device and device-to-network communication to only necessary clinical workflows; enable network monitoring to detect anomalous traffic patterns or repeated connection attempts; and review alarm configuration policies to detect unauthorized changes. Coordinate any firmware updates with clinical engineering and your downtime windows to minimize patient care disruption.

Patch guidance

Contact Dräger technical support or consult their security advisory portal for confirmed fixed firmware versions. Dräger typically provides firmware updates through their service channels; do not assume VG4.2 is fully patched without explicit vendor confirmation. Schedule updates during planned maintenance windows in coordination with clinical leadership. Test patches in a non-critical environment first if feasible. Document baseline configurations before and after patching to detect unauthorized modifications.

Detection guidance

Monitor patient monitor logs and network traffic for: repeated or malformed network messages directed at Cockpit or M540 devices; unexplained alarm state changes or threshold modifications not corresponding to clinical orders; device resets or loss of network connectivity without scheduled maintenance; unusual outbound network connections from monitors; and network traffic on non-standard ports to the monitor segments. Deploy network IDS/IPS rules to detect spoofed packets targeting medical device protocols. Clinical engineering should establish baseline traffic profiles for normal operation and alert on deviations. Review system event logs regularly for evidence of tampering or unauthorized configuration changes.

Why prioritize this

This vulnerability combines high CVSS impact (8.6, HIGH severity), network-based unauthenticated attack surface, and direct risk to patient safety monitoring. Patient monitors are critical infrastructure in acute care; loss of monitoring, false alarms, or settings tampering can cascade into clinical harm. The availability impact (system reboot) combined with integrity impact (settings modification) elevates urgency. Although not yet in active exploitation tracked by CISA KEV, medical device attackers routinely target monitoring infrastructure, and the low exploitation barrier makes prioritization appropriate for any organization operating these systems.

Risk score, explained

CVSS 3.1 score of 8.6 (HIGH) reflects: Attack Vector Network (AV:N) – no physical proximity required; Attack Complexity Low (AC:L) – standard network access sufficient; Privileges Required None (PR:N) – no authentication; User Interaction None (UI:N) – automatic exploitation possible; Scope Unchanged (S:U) – impact limited to the vulnerable component; Confidentiality Impact Low (C:L) – partial data exposure possible; Integrity Impact Low (I:L) – settings can be modified; Availability Impact High (A:H) – device reboot and network loss. The high availability impact and direct network accessibility justify the HIGH severity tier despite only partial confidentiality/integrity loss.

Frequently asked questions