CVE-2019-25720: Dräger SC Monitoring DoS – Network Reboot Attack

Technical summary

CVE-2019-25720 is a denial-of-service vulnerability affecting Dräger SC Monitoring devices across all software versions. The flaw stems from insufficient input validation in network packet handling (CWE-1286: Improper Neutralization of Special Elements used in an Expression). An unauthenticated, network-adjacent attacker can exploit this by sending malformed packets that trigger an uncontrolled device reboot. Repeated exploitation prevents normal operation and can force the device into a degraded state with default configuration and severed network connectivity.

Business impact

Healthcare facilities depend on continuous, reliable patient monitoring. Repeated forced reboots create gaps in clinical visibility and force staff to revert to manual monitoring, increasing workload and potential for missed alerts during critical periods. The loss of network connectivity compounds the issue, preventing remote oversight and data aggregation. In ICU or operating room environments, such disruptions pose direct patient safety risks and may trigger incident response protocols that consume clinical resources.

Affected systems

All versions of Dräger SC Monitoring devices are vulnerable, specifically the SC 6002XL, SC 6802XL, SC 7000, SC 8000, and SC 9000 XL models. The vulnerability exists across the entire product lifecycle for these models with no version exceptions noted.

Exploitability

Exploitation requires network adjacency (same network segment or subnet) but no authentication credentials. The attack is trivial to execute—sending malformed packets requires basic network tools and does not depend on complex conditions or timing. However, impact is limited to denial-of-service rather than data theft or system compromise. The CVSS score of 6.5 (MEDIUM) reflects high availability impact offset by the adjacency requirement and lack of confidentiality or integrity compromise.

Remediation

Verify availability of firmware patches from Dräger that address this malformed packet handling issue. If patches are not available, implement network segmentation to restrict access to Dräger SC devices to trusted clinical networks only. Deploy network monitoring and intrusion detection rules to identify and alert on patterns of malformed packets targeting these devices. Configure monitoring devices to operate on isolated, air-gapped, or heavily firewalled network segments separate from general hospital IT infrastructure. Test any firmware updates thoroughly in a controlled environment before clinical deployment given the safety-critical nature of these devices.

Patch guidance

Contact Dräger support to determine patch availability and version numbers for your specific SC device models. Given that the vulnerability affects all software versions, patching should be prioritized as soon as a fix is validated and available. Due to the critical nature of patient monitoring equipment, coordinate any firmware updates with clinical staff to minimize disruption and ensure fallback monitoring procedures are in place. Verify patch compatibility and perform staged rollout in non-critical monitoring areas before hospital-wide deployment.

Detection guidance

Monitor network traffic to Dräger SC devices for malformed or oversized packets that trigger device resets. Configure network switches and firewalls to log and alert on unusual packet patterns to these devices. Enable device-level logging if available to track unexpected reboot events and correlate them with network traffic anomalies. Establish baseline uptime metrics for these devices and alert on abnormal restart frequencies. Implement network access controls to restrict which systems can send packets to these monitors.

Why prioritize this

While the CVSS score is MEDIUM (6.5), the safety-critical nature of patient monitoring systems warrants high prioritization within healthcare environments. Disruption to these devices directly impacts patient safety and clinical decision-making. The ease of exploitation and the lack of authentication requirements mean even unsophisticated attackers on the network can cause harm. Healthcare organizations should treat this with the same urgency as high-severity vulnerabilities in non-critical systems, given the clinical context.

Risk score, explained

CVSS 3.1 score 6.5 (MEDIUM) assigns high severity to the availability impact (A:H) because repeated reboots completely deny the monitoring function. The score is constrained to MEDIUM rather than HIGH because the attack requires network adjacency (AV:A) and does not compromise confidentiality or integrity of patient data. In a healthcare setting, however, the practical risk may exceed the numerical score due to the safety-critical dependency on continuous monitoring.

Frequently asked questions