CVE-2025-7876 is a deserialization vulnerability found in Metasoft 美特软件's MetaCRM product, specifically affecting versions 6.4.0 through 6.4.2. The vulnerability resides in the AnalyzeParam function within the download.jsp file, where the argument 'p' is improperly handled, allowing an attacker to manipulate serialized data. This manipulation leads to unsafe deserialization, which can be exploited remotely without requiring user interaction or authentication. Deserialization vulnerabilities typically allow attackers to execute arbitrary code, escalate privileges, or cause denial of service by injecting malicious serialized objects that the application processes insecurely. Although the CVSS 4.0 score is 5.3 (medium severity), the nature of deserialization flaws often implies a significant risk, especially if the application processes sensitive data or operates in critical environments. The vendor was contacted but did not respond, and no patches have been released yet. No known exploits are currently observed in the wild, but public disclosure of the exploit code increases the risk of exploitation. The vulnerability's attack vector is network-based with low attack complexity and no privileges or user interaction required, making it accessible to remote attackers. The impact on confidentiality, integrity, and availability is limited but present, as indicated by the CVSS vector components (VC:L, VI:L, VA:L).

For European organizations using MetaCRM versions 6.4.0 to 6.4.2, this vulnerability poses a tangible risk of remote compromise. Since MetaCRM is a customer relationship management system, it likely handles sensitive customer data, business intelligence, and internal communications. Exploitation could lead to unauthorized access to confidential customer information, manipulation or corruption of CRM data, and potential disruption of CRM services. This could result in reputational damage, regulatory non-compliance (e.g., GDPR violations), and operational downtime. The lack of vendor response and absence of patches exacerbate the risk, as organizations may remain exposed for extended periods. European companies in sectors such as finance, retail, and manufacturing that rely on MetaCRM for customer data management are particularly vulnerable. Additionally, the remote and unauthenticated nature of the exploit increases the attack surface, potentially enabling attackers from anywhere to target these organizations. The medium severity rating suggests that while the impact is not catastrophic, the threat should be taken seriously, especially given the public availability of exploit details.

Given the absence of official patches, European organizations should implement immediate compensating controls. First, restrict network access to the MetaCRM download.jsp endpoint by applying strict firewall rules or web application firewall (WAF) policies to block or monitor suspicious requests targeting the 'p' parameter. Employ input validation and sanitization at the application or proxy level to detect and reject malformed serialized data. Conduct thorough logging and monitoring of access to the vulnerable endpoint to identify potential exploitation attempts. If feasible, isolate the MetaCRM server within a segmented network zone with limited external exposure. Organizations should also consider temporarily disabling or restricting the use of the AnalyzeParam function or the download.jsp page if business operations allow. Engage with Metasoft for updates or patches and subscribe to vulnerability advisories. Finally, prepare incident response plans specific to deserialization attacks to enable rapid containment if exploitation occurs.