CVE-2025-62002 identifies a security weakness in BullWall's Ransomware Containment product, specifically versions 4.6.0.0, 4.6.0.6, 4.6.0.7, and 4.6.1.4. The product detects ransomware activity by monitoring the number of files modified within a system and triggers alerts when a configured threshold is exceeded. However, this detection logic is flawed because it does not account for the size or criticality of individual file modifications. An attacker with valid authentication credentials can exploit this by encrypting a single file—potentially a large or critical one—without surpassing the configured file modification count threshold, thereby evading detection. This represents an improperly implemented security check (CWE-358) where the security mechanism relies solely on a quantitative metric (number of files changed) rather than qualitative analysis of file changes. The vulnerability does not require user interaction but does require the attacker to have authenticated access, which limits the attack surface to insiders or compromised accounts. There are no known exploits in the wild at this time, and no patches have been published yet. The CVSS 3.1 base score is 4.3 (medium severity), reflecting the limited scope and authentication requirement. This vulnerability could allow ransomware operators to bypass containment controls, potentially leading to partial encryption of critical data without detection, undermining the integrity of affected systems. Since the detection threshold is user-configurable, organizations with higher thresholds are more vulnerable. The issue affects multiple recent versions of BullWall Ransomware Containment, and other versions may also be impacted but have not been confirmed.

For European organizations, this vulnerability poses a risk primarily to data integrity and operational continuity. If attackers exploit this flaw, they can encrypt critical files without triggering ransomware containment alerts, potentially leading to undetected ransomware activity and data loss. This can result in business disruption, financial losses, and reputational damage. Organizations relying on BullWall Ransomware Containment for ransomware defense may have a false sense of security if detection thresholds are set too high or if monitoring does not consider large single-file changes. Critical sectors such as finance, healthcare, energy, and government entities in Europe could be particularly impacted due to their reliance on robust ransomware defenses and the high value of their data. The requirement for attacker authentication reduces the risk from external threat actors but increases concern about insider threats or compromised credentials. The absence of known exploits in the wild suggests limited immediate risk, but the vulnerability should be addressed proactively to prevent future exploitation.

European organizations using affected BullWall versions should immediately review and adjust ransomware detection thresholds to lower values, ensuring that even single large file modifications can trigger alerts. Implement additional monitoring for unusual file size changes or encryption patterns beyond just file count metrics. Enforce strict access controls and multi-factor authentication to reduce the risk of credential compromise and insider threats. Conduct regular audits of user activity and file modification logs to detect suspicious behavior early. Stay informed about vendor updates and apply patches promptly once released. Consider deploying complementary ransomware detection technologies that analyze file content changes or behavior analytics to supplement BullWall’s detection. Train security teams to recognize signs of ransomware activity that may bypass file count thresholds. Finally, maintain robust offline backups to enable recovery in case of successful ransomware encryption.