Critical Vulnerabilities Identified in Ebyte NA111-M Gateways

Source context: this article examines information published by the source on August 27, 2026. This site’s publication date is shown separately. Check the latest vendor guidance before acting.

What the vulnerability is

CISA has issued an advisory (ICSA-26-239-05) detailing 13 vulnerabilities affecting the Ebyte NA111-M gateway. These flaws range from missing authentication for critical functions and weak cryptographic algorithms to cleartext transmission of sensitive data, including MQTT credentials.

The most severe issues allow unauthenticated remote attackers to access administrative functionality, modify device settings, or disrupt service availability. Other identified risks include Cross-Site Request Forgery (CSRF), the use of client-side authentication logic that can be bypassed, and a lack of rate limiting on authentication attempts, which facilitates automated brute-force attacks.

Exposure and applicability

These vulnerabilities specifically affect the Ebyte NA111-M gateway running firmware version 9013-2-17.

Because these gateways often bridge different network segments or facilitate remote telemetry via MQTT, exposure is high if the management interface is accessible over a general-purpose network. The vulnerability set allows for full device compromise, which could lead to unauthorized configuration changes or total loss of device availability.

Remediation priorities

At this time, there is no available patch. While Ebyte initially indicated that a fix was under development, CISA reports that the vendor has not responded to subsequent coordination requests and no update has been released.

Our analysis suggests the following prioritized defensive actions for OT asset owners:

1. Network Isolation (Immediate): Ensure all NA111-M gateways are located behind industrial firewalls and are completely isolated from the internet and business networks. This is a primary control to prevent initial remote access.
2. Management Interface Restriction: Limit access to the web management interface to a dedicated, secure management VLAN or a physical console connection. This reduces the likelihood of an attacker reaching the vulnerable administrative functions.
3. Secure Remote Access: If remote management is required, it should be conducted exclusively through a secure VPN. This adds a layer of authentication and encryption before an operator can interact with the gateway’s interface.
4. Credential Audit: Change all default credentials immediately. Some identified vulnerabilities specifically allow disruptive actions (such as factory resets) when default credentials remain in place.

How to validate remediation

Since no firmware patch exists, validation must focus on the effectiveness of compensating network controls rather than software versioning:

• Connectivity Testing: A network administrator should attempt to reach the gateway’s management IP from a non-authorized segment (e.g., the corporate LAN or an external connection) to verify that firewall rules are successfully dropping the traffic.
• Configuration Review: Controls engineers should audit the device configuration to confirm that default passwords have been replaced with unique, complex credentials.

Limits and open questions

Because there is no current patch, the residual risk remains high for any device running firmware 9013-2-17. The primary limitation of the suggested mitigations is that they address the access path rather than the underlying software flaws; if an attacker gains a foothold within the trusted OT network, these devices remain vulnerable to internal exploitation.

It remains unknown when Ebyte will release a formal firmware update or if subsequent versions will address all 13 identified CVEs. Operators should maintain direct communication with the vendor for updates.

Source and editorial note

Ebyte NA111-M · Source date: August 27, 2026 · Retrieved August 31, 2026.

Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.

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