External risk intelligence

TOTOLINK X18 Command Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2025-61045

The vulnerability exists in a home networking router (TOTOLINK X18). These devices are commonly deployed as edge gateways connecting internal networks to the public internet. Functions related to configuration management in such devices are frequently reachable or exposed via the web-based administrative interface, making them common targets for internet-facing access.

OS Command Injection

Totolink X18 Firmware

9.1.0cu.2053_b20230309

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 command injection vulnerability has been identified in TOTOLINK X18 firmware. This issue could allow an attacker to execute arbitrary commands on affected devices. The primary concern is to confirm if this technology is in use and if it is exposed.

  • Allows attackers to run unauthorized commands.
  • Important for network security and device control.
  • Assess exposure and potential impact.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending a specially crafted request to a device exposed to the internet. This request would target a specific function within the device's firmware, leveraging a flaw in how it handles a parameter. Successful exploitation could allow an attacker to execute arbitrary commands on the affected device.

  • No authentication required.
  • Command injection via `mac` parameter.
  • Leads to arbitrary command execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an unauthenticated attacker to execute arbitrary commands on the affected device when the 'mac' parameter is manipulated in the `setEasyMeshAgentCfg` function. This could impact the device's normal operation and potentially expose its internal network configurations.

  • Device configuration and operation.
  • Command injection via network.
  • Compromised device functionality.

Operational Fix

Recommended remediation, mitigation, and detection steps

This command injection vulnerability in TOTOLINK X18 firmware affects edge devices, likely managed by network or security teams responsible for infrastructure. The first practical step is to identify all instances of this device, determine their exposure and criticality, and then confirm the accountable owner for remediation.

  • Network and Security teams own this.
  • Verify device reachability and business impact.
  • Plan remediation considering vendor coordination.

Supplementary metadata

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.

Frequently asked questions

What is the TOTOLINK X18?

The TOTOLINK X18 is a wireless router used to provide home or small office networking connectivity. It functions as an edge gateway, managing traffic between internal devices and the broader internet. The affected firmware version (9.1.0cu.2053_B20230309) controls the device's operational settings and core networking features, such as the EasyMesh system used to extend wireless coverage.

What does command injection mean for CVE-2025-61045?

Command injection (CWE-77/78) occurs when software improperly cleans inputs before executing them as system commands. In this case, the router fails to filter the 'mac' parameter in the setEasyMeshAgentCfg function. This allows an attacker to insert unauthorized system commands, tricking the router into running malicious code instead of its intended configuration tasks.

How can an attacker trigger this vulnerability?

An attacker triggers this by sending a specially crafted network request to the device that targets the vulnerable function. This does not require any authentication, meaning no login credentials are needed. Sending a standard, non-malicious configuration request to the router will not trigger the bug; the 'mac' parameter must be intentionally manipulated to force the execution of arbitrary commands.

Is my TOTOLINK X18 at risk?

According to Halo Surface Signal, this device is often used as an internet-facing gateway, making it a likely target for remote access. You should be concerned if your specific device is reachable from the public internet. If the management interface is exposed globally rather than kept on a private, local network, the risk of unauthorized command execution increases significantly.

What should I do if I use this router?

Your first step is to locate all TOTOLINK X18 units in your environment to understand your footprint. Once identified, evaluate whether these devices are exposed to the internet. Contact the vendor or consult official support channels for firmware updates that address this vulnerability. Ensure you have a clear owner responsible for patching or restricting network access to the device.

References