External risk intelligence

Dbit T-CPE301K Stack Overflow Reboot Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2026-7192

The affected product is a 4G WiFi minirouter, which is typically deployed as an internet edge gateway. The vulnerability resides in an HTTP-based management interface, which is commonly exposed to the network to facilitate device configuration and connectivity management.

Buffer Overflow

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 a 4G WiFi minirouter that could allow an unauthenticated attacker to disrupt service and reboot the device by sending a specially crafted request. The issue stems from a buffer overflow in how the device handles HTTP POST requests, potentially impacting the device's availability.

Authenticated attackers can crash and reboot routers.
It affects edge devices used for internet connectivity.
Confirm if this router type is in your network.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this by sending a specially crafted HTTP POST request to the device's management interface. This request would target the `/js/common/do_cmd.js` endpoint with an excessively long parameter, triggering a buffer overflow.

Entry condition: Network access to the device.
Trigger point: Manipulated HTTP POST request.
Resulting risk: Denial of service and system reboot.

Live Threat

Current exploitation, exposure, and threat context

A stack-based buffer overflow vulnerability in the Dbit T-CPE301K 4G WiFi minirouter could allow an authenticated attacker to disrupt service. This could occur when an attacker sends a specially crafted HTTP POST request to a specific endpoint, potentially causing a denial of service and system reboot.

Affected asset: WiFi minirouter.
Exposure: Manipulated HTTP POST request.
Consequence: Denial of service and reboot.

Operational Fix

Recommended remediation, mitigation, and detection steps

The Dbit T-CPE301K 4G WiFi minirouter is typically deployed at the network edge, making its management interface a potential target. Responsibility for addressing this vulnerability likely falls to infrastructure or network teams responsible for managing edge devices, in coordination with vendor management if external support is required. The first practical step is to identify all instances of this device, confirm their network exposure and business criticality, and then determine the accountable owner for remediation planning.

Infrastructure or network teams own the issue.
Verify network exposure and criticality.
Plan remediation with vendor coordination.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is the Dbit T-CPE301K 4G WiFi minirouter?

The Dbit T-CPE301K is a compact wireless networking device designed to provide internet connectivity via 4G cellular networks. It acts as a gateway for local devices to access the internet, often serving as a bridge between a cellular provider's signal and a private WiFi network in homes or small office environments.

What is a stack-based buffer overflow in CVE-2026-7192?

A stack-based buffer overflow, classified as CWE-121, occurs when a program writes more data to a temporary memory storage area (the stack) than it is designed to hold. In this case, sending an excessively long parameter to a specific web endpoint causes the extra data to spill over, corrupting critical system registers and causing the device to crash or reboot.

How is this vulnerability triggered?

The flaw is triggered by sending a specially crafted HTTP POST request to the ‘/js/common/do_cmd.js’ endpoint on the router. Note that standard browsing or casual WiFi usage does not trigger this; the exploit requires specific, intentional manipulation of input parameters in that management request to force the memory corruption.

Is my network at risk from this CVE?

According to Halo Surface Signal, this device typically serves as an internet edge gateway, making its management interface a common point of interaction. If your router’s management interface is accessible from the internet, the risk is higher. You should assess whether these devices are configured to allow remote administration from outside your local network.

What should I do if I use this router?

Begin by creating an inventory of all Dbit T-CPE301K units in your environment. Once identified, evaluate whether they are exposed to the public internet or restricted to internal traffic. Determine the business criticality of these connections and establish a plan to coordinate with the vendor or your infrastructure team to manage the security of these edge devices.

References

www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities…

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.