CVE-2026-31847
HIGH EPSS 34.0%
Published Mar 23, 20263mo ago · Modified Jun 17, 20261w ago
8.5 CVSS 4.0
Published Mar 23, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago
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 Details
Base Score
Exploitability
Impact
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Adjacent
Attack Complexity Low
Privileges Required High
User Interaction None
Scope X
Threat Intelligence
EPSS Exploit Probability
34.0% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-912
Affected Products 2
| Vendor | Product | Version | Range |
|---|---|---|---|
| nexxtsolutions | nebula300plus_firmware | * | ≤12.01.01.37 |
| nexxtsolutions | nebula300plus | * | any |
References 2
- nexxt-connectivity-frontend.s3.amazonaws.com https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip
- nexxtsolutions.com https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.