CVE-2025-4019 is a vulnerability identified in the 20120630 Novel-Plus software, specifically affecting the function genCode within the file novel-admin/src/main/java/com/java2nb/common/controller/GeneratorController.java. The vulnerability results from missing authentication controls, allowing an unauthenticated attacker to remotely invoke this function without any credentials or user interaction. The affected version is identified by the commit hash 0e156c04b4b7ce0563bef6c97af4476fcda8f160 or earlier. The vulnerability was publicly disclosed on April 28, 2025, with a CVSS v4.0 base score of 6.9, categorized as medium severity. The CVSS vector indicates that the attack vector is network-based (AV:N), requires no privileges (PR:N), no user interaction (UI:N), and no scope change (S:U). The impact on confidentiality, integrity, and availability is low to medium (VC:L, VI:L, VA:L), meaning the attacker can cause some limited unauthorized access or modification but not full system compromise or denial of service. The vendor was contacted but did not respond or provide a patch, and no known exploits have been observed in the wild yet. The vulnerability is critical in nature due to missing authentication but rated medium overall because of limited impact and no privilege escalation or scope change. The affected function likely generates code or artifacts, which if manipulated, could lead to unauthorized code generation or injection risks. Since the exploit is remotely executable without authentication or user interaction, this vulnerability poses a significant risk to exposed installations of Novel-Plus, especially those accessible from untrusted networks.

For European organizations using the Novel-Plus product, this vulnerability could lead to unauthorized remote code generation or manipulation, potentially allowing attackers to inject malicious code or alter system behavior without authentication. This could compromise the integrity of applications or services relying on Novel-Plus, leading to data corruption or unauthorized access to sensitive information. Although the CVSS score suggests medium severity, the absence of authentication combined with remote exploitability increases the risk profile, especially in environments where Novel-Plus is integrated into critical business processes or software development pipelines. The lack of vendor response and patch availability further exacerbates the risk, as organizations must rely on mitigations or workarounds. The impact on confidentiality, integrity, and availability is limited but non-negligible, potentially affecting software supply chain security and trustworthiness of generated code artifacts. European entities in sectors such as software development, technology services, and critical infrastructure that utilize Novel-Plus could face operational disruptions or reputational damage if exploited.

Immediately restrict network access to the Novel-Plus administrative interface, especially the GeneratorController endpoint, by implementing firewall rules or network segmentation to limit exposure to trusted internal networks only. Implement Web Application Firewall (WAF) rules to detect and block unauthorized requests targeting the genCode function or related API endpoints, focusing on anomalous or unauthenticated access patterns. Conduct a thorough code review and audit of the Novel-Plus source code to identify and patch missing authentication checks manually, if feasible, or develop custom authentication wrappers around vulnerable endpoints. Monitor logs and network traffic for unusual or unauthorized access attempts to the affected function, enabling early detection of exploitation attempts. Engage with the vendor or community to obtain updates or patches; if unavailable, consider migrating to alternative software solutions with active security support. Educate development and operations teams about the risks of missing authentication vulnerabilities and enforce strict access controls and authentication mechanisms in all internal tools and services. Apply defense-in-depth strategies such as endpoint protection, intrusion detection systems, and regular vulnerability scanning to detect and mitigate exploitation attempts. If possible, disable or restrict the genCode function usage until a secure patch or update is available.