External risk intelligence

GoAhead-Webs Stack Overflow on KuWFi AC900 Firmware

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2025-68706

The vulnerability resides in the GoAhead-Webs HTTP daemon within a 4G LTE router. As a consumer-grade wireless router/modem device, the web management interface and associated form handlers are typically designed to be accessible for network configuration. These devices are frequently deployed as internet edge gateways, making their web services inherently public-facing or reachable from the local network.

Buffer Overflow

Kuwfi Ac900 Firmware

1.0.13

Halo Surface Signal: 5 out of 5 — more likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in the GoAhead-Webs HTTP daemon used in certain 4G LTE devices. This issue could allow an unauthenticated attacker to crash the device's web server or potentially execute arbitrary code, impacting the device's availability and security.

A code flaw allows remote attackers to compromise device access.
This affects network edge devices, increasing potential exposure.
Confirm relevance and assess any exposure to critical network services.

Attack Path

How an attacker could exploit the issue

An attacker could reach this vulnerability by accessing the device's web interface over the network. The vulnerable component is the HTTP daemon, specifically a handler that processes user-submitted data without proper size checks. This could lead to the web server crashing or potentially allow the attacker to execute arbitrary code.

Network access to web interface required.
Handler copies user data without checks.
Server crash or code execution.

Live Threat

Current exploitation, exposure, and threat context

The GoAhead-Webs HTTP daemon on KuWFi 4G LTE AC900 devices, when running firmware 1.0.13, is susceptible to a stack-based buffer overflow in the /goform/formMultiApnSetting handler. This vulnerability could allow an unauthenticated network attacker to overwrite adjacent stack memory when supplying an overly long `pincode` parameter. Under certain conditions, this could lead to a web server crash or potentially arbitrary code execution.

Router firmware and service behavior.
Overly long `pincode` parameter sent remotely.
Web server crash or possible code execution.

Operational Fix

Recommended remediation, mitigation, and detection steps

The GoAhead-Webs HTTP daemon vulnerability on KuWFi 4G LTE AC900 devices likely falls under the purview of network infrastructure or IoT device management teams. Given its critical nature and network-accessible attack vector, the immediate priority is to locate all instances of the affected firmware, assess their business criticality and network exposure, and identify the accountable owner for remediation planning.

Own by infrastructure or IoT device management.
Verify device exposure and criticality.
Plan remediation or apply vendor updates.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the KuWFi AC900 device?

The KuWFi AC900 is a portable 4G LTE wireless router and modem designed to provide internet connectivity for multiple users. It functions as a network gateway, typically managing traffic between the local devices it serves and the cellular network. The device uses the GoAhead-Webs HTTP daemon to host its internal management web interface, which allows administrators to configure network settings like APN configurations.

What kind of vulnerability is CVE-2025-68706?

This vulnerability is a stack-based buffer overflow, classified as CWE-121. It occurs because the software fails to verify the length of user-provided data before storing it in a fixed-size memory area called the stack. By sending an excessively long 'pincode' value to a specific web form handler, an attacker can overwrite adjacent memory, which might cause the web service to crash or lead to the execution of unauthorized commands.

How can an attacker trigger this vulnerability?

An attacker triggers this flaw by sending a specially crafted request to the '/goform/formMultiApnSetting' handler on the router's web interface. The issue is specific to how this handler processes the 'pincode' parameter. It is important to note that simply visiting the device's login page or using other non-vulnerable web forms will not trigger this specific memory corruption error.

Is my device at risk based on Halo Surface Signal?

Yes, if you use this router, your device is likely at risk. Halo Surface Signal identifies these routers as internet edge gateways, meaning they are frequently placed where their web management interfaces are reachable from the public internet or the local network. Because the service is inherently designed for network configuration, it is often exposed, significantly increasing the probability that an unauthorized user could reach the vulnerable component.

What should I do if I use a KuWFi AC900 router?

First, confirm if your device is running firmware version 1.0.13, as this is the version identified as affected. If it is, locate the device owner or administrator to assess its criticality to your network operations. Prioritize limiting access to the device's web management interface from untrusted networks and check for any available firmware updates from the vendor to resolve the flaw.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.