External risk intelligence

Cudy Routers Command Injection Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-38713

The vulnerability exists in the ipsec_conn interface of networking hardware (routers/gateways). These devices are commonly deployed at the network edge to manage VPN and IPsec tunnel connections, making the management and interface surfaces frequently reachable from the public internet.

Command Injection

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

This advisory concerns a critical command injection vulnerability discovered in the ipsec_conn interface of certain networking devices. This flaw could allow unauthorized individuals to execute commands with root privileges on affected systems, posing a significant risk to network security and data integrity. The primary concern is confirming the relevance and exposure of these devices within your network environment.

Remote attackers can run commands on devices.
Critical flaw in network edge devices requires awareness.
Confirm relevance and potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending specially crafted input to the `ipsec_conn` interface of affected networking devices. This interface is exposed externally, meaning an attacker does not need any prior access or authentication to reach it. Successful exploitation allows the attacker to execute arbitrary commands with root privileges on the device.

External network exposure required.
Triggered via crafted input to `ipsec_conn`.
Allows arbitrary root command execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could allow an attacker to execute arbitrary commands with root privileges on affected devices. This may occur when an attacker crafts specific input to the `ipsec_conn` interface.

Affected network devices.
Crafted input to the `ipsec_conn` interface.
Arbitrary command execution as root.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability affects network devices, suggesting that infrastructure, platform, and network/security teams are likely responsible for remediation. The initial step should be to identify all instances of the affected devices, determine their exposure to the internet or other untrusted networks, and confirm their business criticality. Once accountable owners are identified, a risk-based remediation plan can be developed.

Infrastructure/Network teams own the issue.
Verify internet-facing devices first.
Plan remediation based on exposure.

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 hardware affected by CVE-2026-38713?

These products include various models in the TR and WR series, such as TR1200, TR3000, WR300, WR1200, WR1300, WR1500, WR3000, WR3600, and WR6500. These devices function as networking hardware, often serving as routers or gateways that manage critical network edge connectivity, including VPN and IPsec tunnel configurations.

How does this command injection vulnerability work?

This flaw belongs to the CWE-77 weakness class, which involves the improper neutralization of special elements used in commands. In this specific case, the ipsec_conn interface fails to safely handle input, allowing an attacker to inject and execute their own unauthorized commands. Because the interface runs with root privileges, the attacker gains full control over the device's operating system.

What triggers the CVE-2026-38713 vulnerability?

An attacker triggers the bug by sending specially crafted input to the ipsec_conn interface. The vulnerability relies on this specific interaction; it is not triggered by normal administrative traffic or standard data passing through the device. No prior authentication or existing access to the device is required to submit this malicious input.

Is my device at risk based on Halo Surface Signal?

The risk depends on how your device is positioned. According to Halo Surface Signal, these routers are often deployed at the network edge to manage VPN tunnels, which frequently makes their management interfaces reachable from the public internet. If your device is internet-facing, it is significantly more likely to be reachable by an attacker attempting to reach the vulnerable interface.

How should I respond to this threat advisory?

Start by identifying all deployed units of the affected TR and WR router models across your environment. Once you have a list, prioritize devices that are exposed to the internet or other untrusted networks, as these are the most accessible to potential attackers. Establish who owns these devices so you can coordinate a plan to mitigate the risk effectively.

References

www.cudy.com/pages/security-advisory/cudy-sa-26-7-ehixbe

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.