Vulnerability · Published Mar 23, 2026 · Assigned by TuranSec
CVE-2026-31847Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Nebula 300+
High 8.5
In plain English
A high-severity security flaw in Nebula 300+ from Nexxt Solutions. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities).
Severity (CVSS 4.0)8.5High
Exploit odds (30 days)0.4%top 61.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Nexxt Solutions | Nebula 300+ | <= 12.01.01.37 – through Nebula300+_v12.01.01.37 |
Weakness: CWE-912 · 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:N
References
- Official product page third-party-advisory
- Firmware download third-party-advisory