CVE-2025-67617 is a critical vulnerability identified in themeton's Consult Aid software, versions up to and including 1.4.3. The flaw arises from insecure deserialization of untrusted data, which allows attackers to perform object injection attacks. Deserialization vulnerabilities occur when software deserializes data from untrusted sources without sufficient validation, enabling attackers to manipulate serialized objects to execute arbitrary code or alter program logic. In this case, the vulnerability permits remote, unauthenticated attackers to inject malicious objects into the application, potentially leading to full system compromise. The CVSS v3.1 score of 9.8 reflects the high severity, with attack vector being network-based, no privileges or user interaction required, and impacts on confidentiality, integrity, and availability rated as high. This means an attacker can remotely exploit the vulnerability to execute arbitrary code, steal sensitive information, modify data, or disrupt service availability. Although no public exploits are currently reported, the nature of deserialization vulnerabilities and the criticality of the affected software make this a high-risk issue. The lack of available patches at the time of disclosure increases the urgency for organizations to implement interim mitigations and monitor for suspicious activity. The vulnerability affects Consult Aid, a product likely used in consulting or healthcare-related workflows, where data confidentiality and system integrity are paramount.

For European organizations, the impact of CVE-2025-67617 is substantial. Exploitation could lead to unauthorized access to sensitive client or patient data, manipulation or destruction of critical records, and disruption of consulting or healthcare services. This can result in regulatory non-compliance, especially under GDPR, leading to heavy fines and reputational damage. The ability to execute arbitrary code remotely without authentication means attackers could establish persistent footholds, move laterally within networks, and launch further attacks. Organizations relying on Consult Aid for critical operations may face operational downtime, loss of trust from clients or patients, and potential financial losses. The threat is particularly acute for sectors handling sensitive personal data or intellectual property. Additionally, the absence of known exploits currently does not diminish the risk, as attackers often develop exploits rapidly after disclosure of such vulnerabilities.

1. Immediate implementation of network-level controls such as firewall rules to restrict access to Consult Aid services only to trusted internal IPs or VPN users. 2. Employ strict input validation and sanitization on all data entering the Consult Aid application to prevent malicious serialized objects from being processed. 3. Monitor application logs and network traffic for unusual deserialization patterns or unexpected object payloads indicative of exploitation attempts. 4. Isolate Consult Aid servers in segmented network zones to limit lateral movement if a compromise occurs. 5. Engage with themeton for timely patch releases and apply security updates as soon as they become available. 6. Conduct regular security assessments and penetration tests focusing on deserialization and injection attack vectors. 7. Educate IT and security teams about the risks of deserialization vulnerabilities and the importance of rapid incident response. 8. Consider deploying runtime application self-protection (RASP) or web application firewalls (WAF) with rules targeting deserialization attacks as an interim defense.