CVE-2026-76940 in NE2-D11
Summary
by MITRE • 08/28/2026
The affected Ebyte device does not restrict repeated authentication attempts through rate limiting or account lockout mechanisms. This could allow an attacker to perform automated authentication attacks against deployments that rely on password based authentication.
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Analysis
by VulDB Data Team • 08/28/2026
The identified vulnerability in the Ebyte device represents a critical deficiency in access control mechanisms, specifically concerning the handling of authentication requests. The core technical flaw lies in the absence of rate limiting or account lockout policies for login attempts. In secure system design, it is standard practice to implement controls that restrict the number of consecutive failed authentication attempts within a specific time window. Without these safeguards, the device treats every authentication request with equal weight regardless of frequency, allowing an attacker to submit thousands of credential combinations in rapid succession without triggering any defensive responses such as temporary account suspension or IP-based blocking.
This lack of mitigation directly facilitates brute-force and password spraying attacks against deployments that rely on static passwords for access. An adversary can leverage automated tools to systematically guess valid credentials by cycling through common usernames, default passwords, or dictionaries derived from leaked credential databases. Because the system does not enforce delays between attempts or lock out accounts after a threshold of failures, the attack surface remains fully exposed to high-speed computational guessing. This significantly reduces the time and resources required for an attacker to compromise user accounts, especially if weak or predictable passwords are in use by administrators or end-users.
From a risk perspective, this vulnerability aligns with CWE-307 Improper Restriction of Excessive Authentication Attempts, which highlights the failure to limit repeated login attempts. Furthermore, it maps directly to MITRE ATT&CK technique T1110 Brute Force, where adversaries attempt to gain access by systematically trying various password combinations. The operational impact is severe, as successful authentication can lead to unauthorized configuration changes, data exfiltration, or further lateral movement within the network if the device serves as a gateway or critical infrastructure component. Compromised credentials may also be used for persistent backdoor access, undermining the integrity and confidentiality of the entire system environment.
To mitigate this risk, immediate remediation steps should focus on implementing robust account lockout policies that temporarily disable accounts after a defined number of failed attempts. Additionally, deploying rate limiting at both the application layer and network perimeter can throttle excessive authentication requests from single sources. It is also advisable to enforce strong password complexity requirements and consider multi-factor authentication where supported by the device firmware. Regular monitoring for anomalous login patterns should be established to detect ongoing brute-force campaigns in real-time, ensuring that any unauthorized access attempts are identified and blocked before credentials are successfully guessed.