CVE-2025-7117 is a critical buffer overflow vulnerability identified in the UTT HiPER 840G device, specifically affecting versions up to 3.1.1-190328. The vulnerability resides in an unknown code segment related to the /goform/websWhiteList endpoint, where manipulation of the addHostFilter argument can trigger a buffer overflow condition. This flaw allows an unauthenticated remote attacker to send specially crafted requests to the device, causing memory corruption. The vulnerability is exploitable over the network without requiring user interaction or prior authentication, making it highly accessible to attackers. The buffer overflow could lead to arbitrary code execution, potentially allowing an attacker to take full control of the device, disrupt its operation, or use it as a pivot point for further network compromise. Despite early notification, the vendor has not responded or issued a patch, and while no known exploits are currently observed in the wild, the public disclosure of the exploit code increases the risk of imminent exploitation. The CVSS 4.0 base score of 8.7 reflects the high impact on confidentiality, integrity, and availability, with low attack complexity and no need for privileges or user interaction.

For European organizations using UTT HiPER 840G devices, this vulnerability poses a significant risk. Compromise of these devices could lead to unauthorized access to internal networks, data exfiltration, disruption of critical services, and potential lateral movement within corporate environments. Given that these devices may be part of network infrastructure or specialized industrial or communication equipment, exploitation could impact operational continuity and data security. The lack of vendor response and patch availability increases exposure time, making timely mitigation essential. Organizations in sectors such as telecommunications, manufacturing, and critical infrastructure are particularly vulnerable, as attackers could leverage this flaw to disrupt services or conduct espionage. Additionally, the remote and unauthenticated nature of the exploit means attackers can target devices directly from the internet, increasing the attack surface and risk for European enterprises with externally accessible UTT HiPER 840G devices.

1. Immediate network-level mitigation: Block or restrict access to the /goform/websWhiteList endpoint on UTT HiPER 840G devices via firewall rules or network segmentation to prevent unauthorized external access. 2. Implement strict ingress filtering to limit exposure of these devices to untrusted networks, especially the internet. 3. Monitor network traffic for anomalous requests targeting the addHostFilter parameter or unusual activity on the affected devices. 4. Conduct an inventory to identify all UTT HiPER 840G devices and verify firmware versions to assess exposure. 5. If possible, disable or restrict the vulnerable web interface functionality until a patch is available. 6. Engage with UTT or authorized vendors to demand a security update or official guidance. 7. Prepare incident response plans for potential exploitation scenarios, including device isolation and forensic analysis. 8. Consider deploying intrusion detection/prevention systems (IDS/IPS) with custom signatures to detect exploitation attempts targeting this vulnerability. 9. Regularly review and update network device configurations to minimize attack surface and ensure secure management interfaces.