CVE-2025-68706 is a stack-based buffer overflow vulnerability identified in the GoAhead-Webs HTTP daemon component embedded within KuWFi 4G LTE AC900 devices running firmware version 1.0.13. The vulnerability arises from improper handling of the 'pincode' parameter in the /goform/formMultiApnSetting HTTP handler. Specifically, the code uses the unsafe sprintf() function to copy the user-supplied 'pincode' string into a fixed-size 132-byte stack buffer without performing any bounds checking. This lack of validation allows an attacker to supply an overly long input, overflowing the buffer and overwriting adjacent stack memory. The consequences of this overflow include potential corruption of control data such as return addresses or function pointers, which can lead to denial of service via server crashes or, under certain conditions, arbitrary code execution. The vulnerability is remotely exploitable over the network without requiring authentication or user interaction, as the HTTP daemon listens for incoming requests. The CVSS v3.1 base score is 9.8 (critical), reflecting the high impact on confidentiality, integrity, and availability, combined with low attack complexity and no privileges required. Although no public exploits have been reported yet, the vulnerability poses a significant risk to affected devices. The GoAhead-Webs HTTP daemon is a widely used embedded web server in IoT and networking devices, and KuWFi 4G LTE AC900 is a device commonly deployed in LTE networking scenarios. The vulnerability is categorized under CWE-121 (stack-based buffer overflow), a well-known class of memory corruption bugs that are often leveraged for remote code execution. The absence of available patches at the time of disclosure necessitates urgent mitigation actions.

The impact of CVE-2025-68706 on European organizations can be severe, particularly for those relying on KuWFi 4G LTE AC900 devices in their network infrastructure. Successful exploitation can lead to complete compromise of the affected device, allowing attackers to execute arbitrary code remotely. This can result in unauthorized access to sensitive network segments, interception or manipulation of data, disruption of network services, and potential pivoting to other internal systems. Critical sectors such as telecommunications providers, industrial control systems, and enterprises using these devices for LTE connectivity could face significant operational disruptions and data breaches. The vulnerability also threatens availability, as exploitation can cause denial of service through server crashes. Given the network-exposed nature of the HTTP daemon and the lack of authentication requirements, the attack surface is broad, increasing the likelihood of exploitation. The absence of known exploits currently provides a limited window for remediation before active attacks emerge. Additionally, compromised devices could be conscripted into botnets or used for further attacks against European infrastructure, amplifying the threat.

To mitigate CVE-2025-68706, European organizations should immediately identify any KuWFi 4G LTE AC900 devices running vulnerable firmware 1.0.13 within their environments. Since no official patches are currently available, organizations should contact the vendor for firmware updates or security advisories. In the interim, disabling or restricting access to the GoAhead-Webs HTTP daemon, particularly the /goform/formMultiApnSetting endpoint, is critical to prevent exploitation. Network-level mitigations such as firewall rules or access control lists should be implemented to block external and untrusted internal access to the device's management interfaces. Employ network segmentation to isolate vulnerable devices from critical infrastructure and sensitive data. Continuous monitoring for anomalous traffic patterns targeting the HTTP daemon and deployment of intrusion detection/prevention systems with signatures for buffer overflow attempts can provide early warning. Organizations should also prepare incident response plans for potential compromise scenarios involving these devices. Finally, consider replacing or upgrading devices that cannot be patched in a timely manner to reduce long-term risk.