Ebyte NE2-D11 CVE-2026-76940

The attack requires network reachability to the Ebyte NE2-D11 authentication interface and that the deployment uses password-based authentication, which the description explicitly identifies as the targeted authentication mode. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) confirms no prior authentication, no special pre-existing condition, and no user interaction are needed to launch the attack. Exploitation is limited by the following factors: network isolation - if the device is segregated behind a firewall or placed on a dedicated OT network unreachable from untrusted hosts, the remote attack vector is blocked; password strength - high-entropy, unique passwords significantly increase brute-force time and may render automated attacks impractical within a reasonable window; and username enumeration - the attacker must know or correctly guess valid account names. There is no indication of a non-default configuration requirement; the missing rate-limit control is present in the default firmware state for any deployment using password authentication.

The CVSS 4.0 score of 8.7 is driven by AV:N/AC:L/PR:N/UI:N with VC:H - a network-reachable, zero-complexity path to credential compromise requiring no authentication prerequisite for the attack itself. The wildcard CPE version string confirms no firmware release has been patched, meaning every deployed unit is vulnerable by default if password authentication is in use. Even a mid-sized municipal utility operator in malbork relying on these modules for SCADA connectivity should treat this as an urgent remediation priority, given that OT device credentials typically provide lateral access into broader industrial networks. EPSS data is not available in the provided intelligence; however, ICS devices with unauthenticated brute-force vectors have historically attracted opportunistic targeting from automated scanners. No KEV listing and no public exploit code have been identified, which moderates immediate urgency, but the absence of any defensive mechanism in the firmware means exploitation requires no sophistication beyond a credential-stuffing script.

An attacker with network access to the Ebyte NE2-D11 management interface uses an automated credential-stuffing or dictionary-attack tool - such as Hydra or a custom script - to submit thousands of username-and-password combinations against the login endpoint. Because the firmware imposes no rate limit or account lockout, the tool iterates unimpeded until a valid credential pair is accepted. Upon success, the attacker authenticates as a legitimate user and gains access to device configuration and any data or controls the interface exposes. No public exploit code or proof-of-concept has been identified at time of analysis.