CVE-2026-73819 in NA111-M
Summary
by MITRE • 08/31/2026
The affected Ebyte
product's vendor configuration utility permits access to administrative functions without verifying the operator's identity under certain credential conditions. An unauthenticated attacker on the adjacent network could modify critical settings or change access credentials, potentially preventing legitimate administrators from managing the device.
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Analysis
by VulDB Data Team • 08/31/2026
The vulnerability described constitutes a critical authentication bypass within the vendor configuration utility of Ebyte products, specifically allowing administrative functions to be accessed without proper identity verification under certain credential conditions. This flaw represents a fundamental failure in implementing secure access control mechanisms, where the software fails to enforce mandatory checks on user credentials before granting elevated privileges. In practical terms, this means that an attacker who has gained network adjacency with the affected device can exploit these weak authentication states to gain unauthorized administrative access. The root cause lies in the application logic not strictly validating session tokens or password hashes during specific operational phases, effectively rendering standard security controls ineffective for those particular interactions.
From a technical perspective, this issue aligns closely with CWE-287 Improper Authentication and CWE-306 Missing Authentication for Critical Function. The absence of robust identity verification allows an unauthenticated actor to interact directly with the administrative interface. This is particularly dangerous because configuration utilities often possess full control over device parameters, including network settings, firmware update mechanisms, and security policies. By bypassing these checks, the attacker can manipulate the internal state of the IoT or networking hardware without triggering standard audit logs or alert systems that would normally detect a login attempt with invalid credentials.
The operational impact of this vulnerability is severe, as it enables an unauthenticated attacker on the adjacent network to modify critical settings and change access credentials. This capability effectively locks out legitimate administrators by altering passwords or disabling remote management features, leading to a denial of service for authorized users who can no longer manage the device. Furthermore, once administrative control is established, the attacker can reconfigure network parameters such as IP addresses, DNS servers, or firewall rules, potentially redirecting traffic through malicious infrastructure or isolating the device from its intended operational environment. This level of compromise transforms a simple configuration tool into a vector for persistent unauthorized access and potential lateral movement within the local network segment.
In terms of threat modeling, this scenario maps to MITRE ATT&CK techniques related to Initial Access via Valid Accounts if credentials are stolen later, or more directly to Privilege Escalation through improper validation mechanisms. The ability to change access credentials ensures persistence, allowing the attacker to maintain control even after initial detection attempts by administrators who might reset configurations without realizing their own accounts have been compromised. This creates a cycle of unauthorized control that is difficult to remediate without full factory resets or manual intervention at the physical device level.
Mitigation strategies must focus on enforcing strict authentication protocols across all administrative endpoints regardless of credential state. Vendors should implement multi-factor authentication for configuration utilities and ensure that session management tokens are validated against current user permissions before executing any privileged commands. Network segmentation is also recommended to restrict access to these devices only from trusted, isolated subnets rather than general adjacent networks where unauthenticated attackers might reside. Additionally, implementing robust logging and monitoring for administrative actions can help detect attempts to exploit this flaw early, allowing security teams to respond before permanent damage or lockout occurs. Regular firmware updates that patch authentication logic flaws are essential to closing these gaps in the device's security posture.