CVE-2026-31847
Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Nebula 300+
- State
- Published
- Severity
- 8.5 High
- Published
- Mar 23, 2026
- Updated
- Aug 10, 2026
- Reserved
- Mar 9, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.5 High | CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | TuranSec |
Weaknesses
- CWE-912 Hidden Functionality
Affected Products
| Product | Versions |
|---|---|
Nebula 300+Nexxt Solutions |
|
References
- Official product pagethird-party-advisory
- Firmware downloadthird-party-advisory
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