External risk intelligence

Cudy TR3000 Command Injection Vulnerability via TR-069 User Password Parameter.

CVE advisorySeverity: CRITICAL (CVSS 9.2)

CVE-2026-75495

The vulnerability involves the TR-069 ACS (Auto-Configuration Server) protocol interface on the Cudy TR3000 router. While network-reachable, TR-069 is typically intended for communication between the device and an ISP-controlled management server rather than public internet exposure. Access is generally restricted to the management network or controlled through internal configuration, making broad public exposure uncommon.

OS Command Injection

Halo Surface Signal: 2 out of 5 — less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This CVE involves a critical vulnerability in Cudy TR3000 routers that could allow an attacker to execute commands with root privileges by sending a specially crafted request. While the vulnerability exists, its exploitation is considered unlikely due to the typical network access restrictions for the affected protocol. The main concern is confirming if your devices are exposed and relevant.

Routers can be remotely commanded by attackers.
Critical vulnerability requires confirmation of exposure.
Assess relevance and potential network impact.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending a specially crafted request to the router's TR-069 management interface. This interface, typically used for device configuration by internet service providers, is exposed to the network. By manipulating the user password parameter within this request, an attacker can inject operating system commands that are then executed with root privileges on the router.

Network access required.
Malicious user password parameter.
Root command execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an attacker with network access to execute arbitrary commands on the router with root privileges. This is possible when a crafted TR-069 request is sent to the device, manipulating a specific parameter that the router processes insecurely.

Router command execution as root.
Crafted TR-069 request to the device.
Compromise of router's network functions.

Operational Fix

Recommended remediation, mitigation, and detection steps

The Cudy TR3000's command injection vulnerability impacts device owners and infrastructure teams. The immediate priority is to identify all deployed TR3000 devices, assess their exposure to the internet or untrusted networks, and determine if they are business-critical. Once ownership is confirmed, a risk-based remediation plan can be developed, which may involve vendor coordination or temporary mitigation.

Identify affected devices and owners.
Verify external reachability and business criticality.
Plan remediation based on assessed risk.

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 Cudy TR3000?

The Cudy TR3000 is a wireless router used to manage network traffic. It includes a feature called the Auto-Configuration Server (ACS) interface, which uses the TR-069 protocol. This allows Internet Service Providers to remotely manage settings, update firmware, and monitor the device's status over a network connection.

What does this CVE-2026-75495 vulnerability mean?

This is an OS command injection flaw, categorized as CWE-78. It means the router incorrectly processes specific data sent to its management interface. Instead of treating the input as a simple password, the system accidentally runs that input as a command. Because the device handles this at the highest permission level, it grants an attacker root control over the system.

How does an attacker trigger this command injection?

An attacker triggers this by sending a malformed request to the router's TR-069 management interface. They insert specific shell metacharacters into the password field of a configuration parameter. Simply navigating to the router's web interface or using standard features will not trigger this; it requires specifically crafting a management request that the system's internal logic executes.

Is my Cudy TR3000 relevant for this vulnerability?

According to Halo Surface Signal, risk is currently considered unlikely for most users. While the vulnerability is critical, it relies on reaching the TR-069 management interface. This interface is usually restricted to communication between the router and an ISP's internal management server, rather than being exposed directly to the public internet.

What should I do if I have a Cudy TR3000?

Start by identifying all Cudy TR3000 units in your network to check their current firmware version. Since the vulnerability is resolved in version 2.5.42 and later, check the vendor's download center for the official update. Prioritize confirming whether any devices are inadvertently reachable from untrusted or public networks while preparing to apply the update.

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.