External risk intelligence

TOTOLINK X5000R Command Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2023-31569

This vulnerability affects a home/small office router product. Routers are designed to serve as internet edge gateways, making their management interfaces or configuration functions, such as WAN configuration, naturally internet-facing or reachable from the network edge in standard deployments.

Command Injection

Totolink X5000r Firmware

9.1.0cu.2350_b20230313

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

This advisory details a critical command injection vulnerability found in a specific router firmware. The flaw allows unauthenticated attackers to execute arbitrary commands on the affected device, potentially leading to a complete compromise of the router and any network traffic it manages. The primary concern is to confirm whether this specific product and firmware version are in use within the organization's environment.

Unauthenticated command execution flaw in router firmware.
Affects network edge devices, posing broad security risks.
Confirm relevance; ensure no widespread exposure exists.

Attack Path

How an attacker could exploit the issue

An attacker could send specially crafted network requests to a vulnerable router. This could allow them to inject malicious commands into the router's system, potentially leading to unauthorized access or control.

No authentication required.
Target the `setWanCfg` function.
Complete system compromise possible.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated attacker to execute arbitrary commands on the affected device by sending specially crafted network requests to the `setWanCfg` function. This could impact the router's functionality and any services routed through it.

Router command execution.
Network requests via `setWanCfg`.
Disruption of network services.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability affects TOTOLINK X5000R devices, potentially exposing them to command injection. Infrastructure or network teams managing these devices should prioritize identifying their presence, assessing their exposure to the internet or business-critical networks, and confirming the accountable owner. Planning remediation efforts will depend on the determined risk and potential impact.

Infrastructure or network team ownership.
Verify device reachability and criticality.
Plan remediation based on risk assessment.

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 TOTOLINK X5000R?

The TOTOLINK X5000R is a wireless router designed for home and small office environments. It acts as a gateway that manages network traffic, connects local devices to the internet, and provides firmware-based management interfaces for network configuration, including Wide Area Network (WAN) settings.

What does CVE-2023-31569 mean by command injection?

This vulnerability is classified as CWE-77, or Improper Neutralization of Special Elements used in a Command. In this context, it means the router's software fails to properly validate input provided to its configuration functions. An attacker can exploit this by sending specially crafted data that the system mistakenly interprets as a command, allowing them to run unauthorized instructions directly on the device's operating system.

How does an attacker trigger this vulnerability?

An attacker triggers the flaw by sending a specifically formatted network request to the device's setWanCfg function. Because this function does not require the user to be authenticated, an attacker does not need to provide login credentials to initiate the attack. Simply interacting with this configuration path with malicious input is sufficient to execute the unwanted commands.

Why should I care if my router is affected?

According to Halo Surface Signal, this router is designed as an internet edge gateway, meaning its management functions are often reachable from the internet or the network edge. Because the vulnerability allows for unauthenticated access, any device directly exposed to the internet is at higher risk of being compromised, potentially allowing an attacker to control the router or intercept traffic passing through your network.

What are the first steps to address this issue?

Begin by auditing your infrastructure to confirm if any TOTOLINK X5000R devices are currently in use. Identify the specific firmware version on those devices and determine their network placement, specifically whether they are exposed to the public internet. Once identified, work with the accountable team to assess the risk and plan necessary updates or configuration changes to secure the device against unauthorized command execution.

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.