CVE-2025-5307 is a high-severity memory corruption vulnerability classified as CWE-125 (Out-of-bounds Read) found in Santesoft's Sante DICOM Viewer Pro. This vulnerability arises from improper bounds checking when processing certain data structures within the application, leading to an out-of-bounds read condition. Exploitation of this flaw allows a local attacker to read memory beyond the intended buffer boundaries, which can result in disclosure of sensitive information or potentially enable arbitrary code execution. The vulnerability requires local access to the system and user interaction, but no prior authentication or elevated privileges are necessary. The CVSS 4.0 base score is 8.4, reflecting the high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges required. The vulnerability affects all versions of Sante DICOM Viewer Pro prior to a patch (no patch links currently available). The product is used primarily in medical imaging environments to view DICOM files, which are standard in radiology and other medical imaging fields. Given the nature of the vulnerability, an attacker could leverage crafted DICOM files or malicious input to trigger the out-of-bounds read, potentially leading to information leakage or execution of arbitrary code within the context of the vulnerable application. This could compromise patient data confidentiality and the integrity of medical imaging workflows.

For European organizations, particularly healthcare providers and medical imaging centers, this vulnerability poses a significant risk. The Sante DICOM Viewer Pro is used to view and analyze medical images, which contain highly sensitive patient health information protected under GDPR and other privacy regulations. Exploitation could lead to unauthorized disclosure of patient data, violating privacy laws and damaging organizational reputation. Additionally, arbitrary code execution could allow attackers to manipulate or disrupt medical imaging processes, potentially impacting clinical decision-making and patient care. The local attack vector means that insider threats or attackers who gain initial access to the network or workstation could exploit this vulnerability. Given the criticality of healthcare services and the increasing targeting of medical infrastructure by cyber adversaries, this vulnerability could be leveraged in targeted attacks or ransomware campaigns. The lack of known exploits in the wild currently reduces immediate risk, but the high severity and ease of exploitation warrant urgent attention.

European healthcare organizations using Sante DICOM Viewer Pro should immediately audit their deployments to identify affected versions. Although no official patches are currently linked, organizations should monitor Santesoft's advisories for updates and apply patches as soon as they become available. In the interim, implement strict access controls to limit local access to systems running the vulnerable software, including enforcing least privilege principles and restricting user interaction with the application to trusted personnel only. Employ application whitelisting and endpoint detection and response (EDR) solutions to detect anomalous behavior indicative of exploitation attempts. Network segmentation should isolate medical imaging systems from general IT infrastructure to reduce attack surface. Additionally, conduct user awareness training to prevent social engineering or inadvertent triggering of malicious files. Regularly back up critical medical data and ensure incident response plans include scenarios involving medical imaging system compromise.