# CVE-2026-76940: Ebyte NE2-D11 missing authentication and excessive authentication attempts

Source: https://junglewise.ai/threats/cve-2026-76940-ebyte-ne2-d11-missing-authentication-and-excessive-authentication  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-28. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-76940 · Severity: high · CVSS 7.5 · Published 2026-08-28

The Ebyte NE2-D11 is an industrial gateway device used to manage critical infrastructure in manufacturing and energy sectors. The device contains multiple authentication bypass vulnerabilities that allow attackers to gain unauthorized administrative access without credentials and perform brute-force password attacks without rate limiting. Exploitation could result in unauthorized configuration changes, data theft, session hijacking, and operational disruption in essential infrastructure.

Technologies: [Ebyte NE2-D11](https://junglewise.ai/threats/technologies/ne2-d11). Vendors: [Ebyte](https://junglewise.ai/threats/vendors/ebyte).

## Quick answers

**Is CVE-2026-76940 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-76940 being exploited in the wild.

**How severe is CVE-2026-76940?** High severity, with a CVSS score of 7.5, published 28 August 2026.

**Which products and versions are affected?** Ebyte NE2-D11 Firmware FW-9167-0-11.

**Is there a fix for CVE-2026-76940?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-76940 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-76940?** Check whether you run Ebyte NE2-D11 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The Ebyte NE2-D11 firmware (FW-9167-0-11) contains multiple critical flaws: (1) missing authentication in web management functions (CVE-2026-73125), allowing unauthenticated remote attackers to access sensitive configuration via network requests; (2) cleartext transmission of sensitive data including authentication credentials (CVE-2026-73809), enabling network-based interception without encryption; (3) plaintext exposure of administrative credentials in the management interface (CVE-2026-73839); (4) client-side authentication logic that attackers can replicate to forge valid requests (CVE-2026-71187); and (5) no rate limiting on authentication attempts (CVE-2026-76940), enabling brute-force attacks. The vulnerabilities are network-reachable and require no authentication or user interaction. Patches are under development but not yet available; mitigation requires network segmentation and access controls.

## Affected products

- Ebyte NE2-D11 Firmware FW-9167-0-11

## Timeline

- 2026-08-25: disclosed
- 2026-08-28: advisory: CISA ICSA-26-237-06 published

## References

- [https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-237-06.json](https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-237-06.json)
- [https://www.cisa.gov/news-events/ics-advisories/icsa-26-237-06](https://www.cisa.gov/news-events/ics-advisories/icsa-26-237-06)

## Related threats

- [Ebyte NE2-D11 credentials exposure in configuration export](https://junglewise.ai/threats/cve-2026-77975-ebyte-ne2-d11-credentials-exposure-in-configuration-export)
- [Ebyte NE2-D11 privilege escalation via missing authorization](https://junglewise.ai/threats/cve-2026-77966-ebyte-ne2-d11-privilege-escalation-via-missing-authorization)
- [Ebyte NE2-D11 weak authentication hashing](https://junglewise.ai/threats/cve-2026-76133-ebyte-ne2-d11-weak-authentication-hashing)
- [Ebyte NE2-D11 missing authentication in management interface](https://junglewise.ai/threats/cve-2026-73819-ebyte-ne2-d11-missing-authentication-in-management-interface)
- [Ebyte NE2-D11 authentication bypass in configuration utility](https://junglewise.ai/threats/cve-2026-77977-ebyte-ne2-d11-authentication-bypass-in-configuration-utility)