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High · 8.5 CVE-2026-31847 EUVD-2026-14413GHSA-892q-6j8f-3q9c

Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Nebula 300+

Published Mar 23, 2026 · Updated Aug 10, 2026 · Assigned by TuranSec

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.

Affected products

VendorProductAffectedFixed
Nexxt Solutions Nebula 300+ <= 12.01.01.37 – ≤ Nebula300+_v12.01.01.37 —

References