HIGHCVE-2026-31847Published Modified CNA TuranSec
CVE-2026-31847: Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Nebula 300+
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.
Metrics
- CVSS v4.0
- 8.5
- Severity
- HIGH
- Fixed in
- —
- Affected Products
- 1
Affected packages
- Nexxt Solutions / Nebula 300+≤ Nebula300+_v12.01.01.37
CVSS Vector
CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NReferences