# CVE-2026-77977: Ebyte NE2-D11 authentication bypass in configuration utility

Source: https://junglewise.ai/threats/cve-2026-77977-ebyte-ne2-d11-authentication-bypass-in-configuration-utility  
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-2026-77977 · Severity: high · CVSS 8.1 · Published 2026-08-28

The Ebyte NE2-D11 is an industrial gateway device used in critical infrastructure environments to manage network communications and device configuration. The configuration utility lacks proper authentication controls, allowing unauthenticated attackers on an adjacent network to perform destructive administrative actions such as rebooting the device or restoring factory settings. This results in loss of configuration and service availability, disrupting industrial operations.

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

## Quick answers

**Is CVE-2026-77977 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77977 being exploited in the wild.

**How severe is CVE-2026-77977?** High severity, with a CVSS score of 8.1, published 28 August 2026.

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

**Is there a fix for CVE-2026-77977?** 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-2026-77977 attacked?** It is attacked from the adjacent network, in a network appliance.

**Am I affected by CVE-2026-77977?** 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 vulnerability is a missing authentication issue (CWE-306) in the Ebyte NE2-D11's web management interface. The configuration utility fails to consistently enforce authentication before granting access to critical administrative functions. An attacker on an adjacent network can invoke disruptive operations including device reboot and factory reset without providing valid credentials, particularly when default credentials remain in place. The attack requires network access to the management interface but no authentication or user interaction. The vendor acknowledged the vulnerability and indicated patch development but has not released a fix or provided a timeline.

## Affected products

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

## Timeline

- 2026-08-25: disclosed

## 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 via client-side token manipulation](https://junglewise.ai/threats/cve-2026-76945-ebyte-ne2-d11-authentication-bypass-via-client-side-token)