CVE-2026-31847— Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Nebula 300+
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I. Basic Information for CVE-2026-31847
Vulnerability Information
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Vulnerability Title
Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Nebula 300+
Source: NVD (National Vulnerability Database)
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
隐藏功能
Source: NVD (National Vulnerability Database)
Vulnerability Title
Nexxt Solutions Nebula 300+ 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nexxt Solutions Nebula 300+是美国Nexxt Solutions公司的一款无线路由器。 Nexxt Solutions Nebula 300+ 12.01.01.37及之前版本存在安全漏洞，该漏洞源于/goform/setSysTools端点存在隐藏功能，可能导致远程启用Telnet服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Nexxt Solutions | Nebula 300+ | <= 12.01.01.37 ~ Nebula300+_v12.01.01.37 | - |
II. Public POCs for CVE-2026-31847
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|---|
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Same Patch Batch · Nexxt Solutions · 2026-03-23 · 6 CVEs total
| CVE-2026-31846 | 6.5 MEDIUM | Unauthenticated Credential Disclosure via /goform/ate in Nexxt Nebula 300+ |
| CVE-2026-31849 | Missing CSRF Protection on Administrative Endpoints in Nexxt Nebula 300+ | |
| CVE-2026-31850 | Plaintext Storage of Credentials in Configuration Backup in Nexxt Nebula 300+ | |
| CVE-2026-31848 | Reversible ecos_pw Cookie Allows Authentication Bypass in Nexxt Nebula 300+ | |
| CVE-2026-31851 | Lack of Rate Limiting Enables Brute-Force Attacks in Nexxt Nebula 300+ |
IV. Related Vulnerabilities
Same product: Nebula 300+
Same vendor: Nexxt Solutions
- CVE-2026-31851
Lack of Rate Limiting Enables Brute-Force Attacks in Nexxt N - CVE-2026-31850
Plaintext Storage of Credentials in Configuration Backup in - CVE-2026-31849
Missing CSRF Protection on Administrative Endpoints in Nexxt - CVE-2026-31848
Reversible ecos_pw Cookie Allows Authentication Bypass in Ne - CVE-2026-31846
Unauthenticated Credential Disclosure via /goform/ate in Nex
Same weakness: CWE-912
V. Comments for CVE-2026-31847
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