CVE-2025-63402 is a vulnerability identified in HCL Technologies Limited's product HCLTech GRAGON prior to version 7.6.0. The issue arises because the APIs exposed by the software do not enforce limits on the number or size of incoming requests. This lack of input validation and rate limiting can be exploited by a remote attacker who has authenticated access with high privileges to execute arbitrary code on the affected system. The vulnerability is categorized under CWE-770, which relates to allocation of resources without limits or throttling, potentially leading to resource exhaustion or code execution. The CVSS v3.1 base score is 5.5, indicating a medium severity level. The vector metrics indicate the attack is network-based (AV:N), requires high attack complexity (AC:H), needs privileges (PR:H), does not require user interaction (UI:N), and impacts confidentiality (C:L), integrity (I:H), and availability (A:L). Although no public exploits are known at this time, the vulnerability could allow attackers to compromise system integrity by executing arbitrary code, potentially leading to unauthorized actions or system instability. The absence of patch links suggests that a fix may not yet be publicly available or is pending release. Organizations using affected versions should be aware of the risk posed by unbounded API requests and the potential for exploitation in environments where attackers have elevated privileges.

For European organizations, the impact of CVE-2025-63402 can be significant, especially for those relying on HCLTech GRAGON in critical business processes or infrastructure. The ability for a remote attacker with high privileges to execute arbitrary code threatens the integrity and confidentiality of sensitive data and could disrupt availability through resource exhaustion or system compromise. This vulnerability could facilitate lateral movement within networks, data breaches, or service outages. Given the medium severity and the requirement for authenticated high-privilege access, the risk is higher in environments where privileged credentials are more accessible or where API endpoints are exposed to broader network segments. The lack of current exploits reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits once patches are released. European organizations in sectors such as finance, government, manufacturing, and telecommunications using HCLTech GRAGON should assess their exposure and prioritize mitigation to avoid operational disruptions and data loss.

To mitigate CVE-2025-63402, European organizations should implement the following specific measures: 1) Immediately inventory and identify all instances of HCLTech GRAGON in use, noting versions prior to 7.6.0. 2) Apply vendor patches or updates as soon as they become available; if no patch exists, engage with HCL Technologies for timelines and interim mitigations. 3) Enforce strict API request rate limiting and size restrictions at the network perimeter or via API gateways to prevent abuse of unbounded requests. 4) Restrict access to GRAGON APIs to only trusted and necessary users, minimizing the number of accounts with high privileges. 5) Monitor API usage logs for anomalous patterns indicative of abuse or attempts to exploit the vulnerability. 6) Implement network segmentation to isolate critical systems running GRAGON from less secure network zones. 7) Conduct regular privilege audits to ensure that only essential personnel have high-level access. 8) Employ intrusion detection systems tuned to detect suspicious API activity. These steps go beyond generic advice by focusing on controlling API request parameters, access restrictions, and proactive monitoring tailored to the nature of this vulnerability.