CVE-2025-11305 is a high-severity buffer overflow vulnerability found in the UTT HiPER 840G device, specifically affecting versions up to 3.1.1-190328. The vulnerability resides in the strcpy function within the /goform/formTaskEdit file, where improper handling of the txtMin2 argument allows an attacker to overflow the buffer. This flaw can be exploited remotely without requiring user interaction or prior authentication, as indicated by the CVSS vector (AV:N/AC:L/AT:N/UI:N/PR:L). The vulnerability impacts confidentiality, integrity, and availability with high impact, as the attacker can potentially execute arbitrary code or cause a denial of service. The vendor has been contacted but has not responded or provided a patch, and a public exploit has been disclosed, increasing the risk of exploitation. The vulnerability is rated with a CVSS 4.0 score of 8.7 (high severity), reflecting its ease of exploitation and significant impact. The lack of vendor response and patch availability further exacerbates the threat landscape for users of this product.

For European organizations using the UTT HiPER 840G device, this vulnerability poses a significant risk. Given that the device is network-accessible and the exploit requires no user interaction or authentication, attackers could remotely compromise affected systems. This could lead to unauthorized access, data breaches, disruption of network services, or use of the device as a foothold for lateral movement within corporate networks. Critical infrastructure, telecommunications providers, and enterprises relying on UTT HiPER 840G for network management or connectivity could face operational disruptions and data integrity issues. The public availability of an exploit increases the likelihood of attacks, potentially targeting European organizations with high-value data or critical services. The absence of a vendor patch means organizations must rely on alternative mitigations, increasing operational complexity and risk.

1. Immediate network-level controls: Restrict access to the management interface of UTT HiPER 840G devices to trusted IP addresses only, using firewall rules or network segmentation to limit exposure. 2. Disable or restrict remote management features if not strictly necessary, to reduce the attack surface. 3. Monitor network traffic for unusual activity targeting the /goform/formTaskEdit endpoint or suspicious payloads indicative of buffer overflow attempts. 4. Employ intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics tuned to detect exploitation attempts of this vulnerability. 5. If possible, replace or upgrade affected devices to versions not impacted by this vulnerability or alternative products until a vendor patch is available. 6. Conduct regular security audits and vulnerability assessments focusing on network devices, ensuring timely detection of exploitation attempts. 7. Maintain comprehensive logging and alerting to enable rapid incident response in case of compromise. 8. Engage with UTT or third-party security vendors for potential unofficial patches or workarounds, and monitor for any future vendor advisories.