External risk intelligence

Tenda TX9 Firmware Stack Overflow Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2024-51313

This vulnerability affects router firmware in a configuration function. Routers and their management interfaces are commonly deployed as edge devices, making the web-based administrative configuration pages a likely target for internet-facing exposure in many consumer and small office deployments.

Halo Surface Signal: 4 out of 5 — 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 firmware of certain Tenda network devices. This issue, a stack overflow, could potentially allow unauthenticated attackers to compromise the device's network services. The primary concern is to confirm if these specific devices are in use and, if so, to assess the associated exposure.

Flaw allows unauthorized network access.
Protects against potential network compromise.
Verify device usage and impact.

Attack Path

How an attacker could exploit the issue

An attacker could remotely target the Tenda TX9 router's web interface by sending a specially crafted request to the `/goform/SetVirtualServerCfg` endpoint. This could exploit a stack overflow vulnerability within the device's firmware, potentially leading to severe impacts on the device's confidentiality, integrity, and availability.

No authentication required for access.
Triggered by sending a malformed request to a specific configuration endpoint.
Risk of complete device compromise.

Live Threat

Current exploitation, exposure, and threat context

A stack overflow in the `SetVirtualServerCfg` function could allow an unauthenticated attacker to disrupt the device's services or potentially execute arbitrary code. This could occur when the device's web-based configuration interface is accessible over the network.

Router configuration data.
Network access to a configuration interface.
Denial of service or code execution.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in Tenda TX9 router firmware likely requires action from network or security teams responsible for managing edge devices, in coordination with the product owner if identifiable. The first practical step is to confirm the presence and exposure of Tenda TX9 devices, assess their business criticality, and then plan remediation by engaging the vendor or implementing temporary risk reduction measures if immediate patching is not feasible.

Network and security teams own this.
Verify Tenda TX9 device exposure and criticality.
Coordinate vendor engagement or temporary risk reduction.

Supplementary metadata

CVSS vector

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Frequently asked questions

What is the Tenda TX9 device?

The Tenda TX9 is a networking device that manages traffic and connectivity, often used in homes or small offices. This specific vulnerability involves the device's firmware—the core software that controls hardware functions—specifically within the web-based administrative system used to configure network settings.

What does CVE-2024-51313 mean by stack overflow?

This CVE describes a stack overflow, classified as CWE-121. In plain terms, this is a memory error where the software receives more data than it can handle in a reserved space, causing it to overflow into adjacent memory. For this device, it happens when the system processes an overly large or malformed request, which can crash the service or allow unintended commands to run.

How is this vulnerability triggered?

An attacker triggers this flaw by sending a specifically crafted network request to the device's configuration endpoint, `/goform/SetVirtualServerCfg`. Because this specific function does not require authentication, the attack can be initiated without needing a password. The bug is not triggered by standard usage or legitimate traffic, only by requests designed to exploit the memory handling flaw.

Is my Tenda TX9 at risk?

Halo Surface Signal indicates that since this vulnerability exists in a core router configuration page, it is frequently exposed to the internet in common deployments. You should consider the device at higher risk if its web-based management interface is reachable from outside your local network. Devices accessible only from the internal local network have a reduced attack surface compared to those directly facing the public internet.

What should I do if I use this router?

Your first step is to confirm where your Tenda TX9 devices are deployed and whether their administrative interfaces are accessible via the internet. Once identified, evaluate the criticality of those devices to your network operations. You should then check the manufacturer's official support resources for available firmware updates and plan to apply them to resolve the underlying memory 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.