CVE-2026-31847
High
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.
SeverityHigh
CVSS8.8
Exploit probability—
ProductNexxtsolutions Nebula300plus Firmware
PublishedMar 23, 2026
First seenMar 23, 2026
Weakness typeCWE-912CWE-912
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| nexxtsolutions nebula300plus_firmware | v ≤ 12.01.01.37 | — |
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