Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nexxtsolutions | Nebula300Plus Firmware | <= 12.01.01.37 |
| Nexxtsolutions | Nebula300Plus | - |
Related Weaknesses (CWE)
References
- https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.0Product
- https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/Product
FAQ
What is CVE-2026-31847?
CVE-2026-31847 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 req...
How severe is CVE-2026-31847?
CVE-2026-31847 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31847?
Check the references section above for vendor advisories and patch information. Affected products include: Nexxtsolutions Nebula300Plus Firmware, Nexxtsolutions Nebula300Plus.