CVE-2020-16239 in SureSigns VS4
Summary
by MITRE
Philips SureSigns VS4, A.07.107 and prior. When an actor claims to have a given identity, the software does not prove or insufficiently proves the claim is correct.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 06/05/2025
The vulnerability identified as CVE-2020-16239 affects Philips SureSigns VS4 medical monitoring devices running firmware versions A.07.107 and earlier. This represents a critical identity verification weakness within the device's authentication framework that fundamentally undermines the security posture of healthcare monitoring systems. The issue stems from insufficient or absent cryptographic proof mechanisms that should validate identity claims made by actors interacting with the device's interface or network services.
This vulnerability falls under the category of insufficient authentication or identity verification flaws, which are classified as CWE-287 in the Common Weakness Enumeration catalog. The device fails to implement proper challenge-response mechanisms or cryptographic verification protocols that would confirm the legitimacy of claimed identities. In healthcare environments where patient monitoring systems handle sensitive medical data and critical life-support functions, this weakness creates a significant attack surface that malicious actors could exploit to gain unauthorized access to monitoring data or potentially manipulate patient information.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it creates opportunities for man-in-the-middle attacks where attackers can impersonate legitimate users or system components. The lack of robust identity proof mechanisms means that an attacker could potentially intercept communications, present false credentials, or establish unauthorized sessions with the monitoring device. This threat is particularly concerning in hospital environments where multiple users interact with monitoring systems and where the integrity of medical data directly impacts patient care quality and safety.
From an adversarial perspective, this vulnerability aligns with tactics described in the MITRE ATT&CK framework under the credential access and defense evasion domains. Attackers could leverage this weakness to establish persistent access to patient monitoring data, potentially leading to data breaches or manipulation of critical health information. The vulnerability also represents a potential pathway for attackers to move laterally within hospital networks, as medical devices often serve as entry points for broader network infiltration attempts.
The recommended mitigations for this vulnerability include immediate firmware updates from Philips to address the identity verification implementation, implementation of network segmentation to limit access to monitoring devices, and deployment of additional authentication layers such as multi-factor authentication or network access control solutions. Organizations should also conduct thorough security assessments of their medical device environments to identify similar authentication weaknesses in other critical systems. The vulnerability underscores the importance of implementing robust identity verification mechanisms in healthcare IoT devices, particularly those handling sensitive patient data and supporting critical care functions.