CVE-2025-4394 Medtronic CVE debrief

Who should care

Hospitals, clinics, physicians, home-care teams, and patients who use or manage Medtronic MyCareLink Patient Monitor model 24950 or 24952 devices should care, especially where the monitor could be physically accessed outside a controlled environment.

Technical summary

The advisory describes cleartext storage on internal device storage: files on the monitor are not encrypted at rest, so someone with physical access could read and modify them. The supplied CVSS vector is AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (6.8 Medium), which is consistent with a confidentiality, integrity, and availability impact if the device is tampered with. The issue aligns with CWE-312 (Cleartext Storage of Sensitive Information).

Defensive priority

Medium. The attack requires physical access, which narrows exposure, but the potential impact to device data integrity and confidentiality is high enough to justify timely verification of update status and physical safeguards.

Recommended defensive actions

• Ensure affected monitors are connected to the internet so the automatic security update process can run.
• Maintain possession of the home monitor and restrict physical access to the device.
• Use only home monitors provided directly by a healthcare provider or a Medtronic representative.
• Verify whether deployed devices are model 24950 or 24952 and confirm they have received the vendor update.
• Follow Medtronic's security bulletin and contact [email protected] if additional assistance is needed.
• Apply CISA guidance for securing internet-connected devices and home network security in patient home deployments.

Evidence notes

All substantive claims here come from the supplied CISA CSAF advisory and its remediation text. The advisory for ICSMA-25-205-01 / CVE-2025-4394 was initially published on 2025-07-24 and revised in Update A on 2026-05-07. CISA states the vulnerability involves an unencrypted filesystem on internal storage and that exploitation requires physical tampering. The remediation section says Medtronic began deploying security updates in June 2025 and that the update process runs automatically when the monitor is connected to the internet.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.