CVE-2026-31847
Received Received - Intake
Hidden Telnet Enablement in Nexxt Nebula 300+ Firmware

Publication date: 2026-03-23

Last updated on: 2026-04-29

Assigner: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c

Description
Hidden functionality in the /goform/setSysTools endpoint in Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 allows remote enablement of a Telnet service. By sending a crafted POST request with parameters such as telnetManageEn=true and telnetPwd, an authenticated attacker can activate a Telnet service on port 23. This exposes a privileged diagnostic interface that is not intended for external access and can be used to interact with the underlying system.
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Meta Information
Published
2026-03-23
Last Modified
2026-04-29
Generated
2026-06-16
AI Q&A
2026-03-23
EPSS Evaluated
2026-06-15
NVD
CVE-2026-31847
EUVD
EUVD-2026-14413
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
nexxtsolutions nebula300plus_firmware to 12.01.01.37 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-912 The product contains functionality that is not documented, not part of the specification, and not accessible through an interface or command sequence that is obvious to the product's users or administrators.
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Executive Summary

This vulnerability exists in the Nexxt Solutions Nebula 300+ firmware up to version 12.01.01.37. It involves hidden functionality in the /goform/setSysTools endpoint that allows an attacker to remotely enable a Telnet service on the device.

Once the Telnet service is enabled, it exposes a privileged diagnostic management interface over the network. This increases the device's attack surface and can lead to further compromise.

Impact Analysis

The vulnerability can impact you by allowing remote attackers to enable a Telnet service that exposes a privileged diagnostic management interface.

This increases the attack surface of the device, potentially allowing unauthorized access and further compromise of the device and its network.

Compliance Impact

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Detection Guidance

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