CVE-2025-66838 identifies a vulnerability in the Aris software, specifically versions up to 10.0.23.0.3587512, where the file upload feature does not enforce any rate limiting or throttling mechanisms. This lack of control enables an attacker to upload files at an unlimited rate, which can rapidly consume server resources such as disk space and CPU, leading to resource exhaustion. The consequence of such an attack includes degraded server performance and potential denial of service (DoS) conditions, impacting the availability of the Aris service. The vulnerability does not require authentication or user interaction to exploit, assuming the attacker has access to the upload functionality, which increases the risk profile. No CVSS score has been assigned yet, and no public exploits have been reported, but the technical nature of the flaw suggests that exploitation would be relatively straightforward for an attacker with access. The absence of patch links indicates that a fix may not yet be available, emphasizing the need for interim mitigations. This vulnerability primarily threatens the availability aspect of the affected systems, with indirect impacts on business continuity and operational efficiency. Organizations relying on Aris for business process management should prioritize detection and mitigation to prevent potential service disruptions.

For European organizations, exploitation of this vulnerability could lead to significant operational disruptions due to service degradation or outages caused by resource exhaustion. Organizations in sectors such as finance, manufacturing, and government that rely heavily on Aris for process modeling and management may experience downtime, impacting productivity and service delivery. The increased server load and disk space consumption could also lead to increased costs related to emergency incident response, system recovery, and potential data loss if storage limits are exceeded. Additionally, prolonged availability issues could damage organizational reputation and customer trust. Since the vulnerability does not require authentication, it broadens the attack surface, increasing the risk of exploitation by external threat actors. The lack of known exploits currently reduces immediate risk but does not eliminate the potential for future attacks, especially as awareness of the vulnerability grows.

Organizations should implement immediate monitoring of file upload activity within Aris to detect unusual spikes in upload volume. Deploying network or application-level rate limiting controls can help restrict the number of uploads per user or IP address, mitigating the risk of resource exhaustion. If possible, restrict upload functionality to authenticated and authorized users only, reducing exposure. Regularly review and increase available disk space and server capacity as a temporary buffer against exhaustion. Engage with the software vendor to obtain patches or updates addressing this vulnerability and apply them promptly once available. Additionally, consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block abnormal upload patterns. Conduct internal audits to identify all instances of Aris deployments and ensure consistent application of these mitigations. Finally, prepare incident response plans to quickly address potential exploitation attempts.