CVE-2026-31851— Lack of Rate Limiting Enables Brute-Force Attacks in Nexxt Nebula 300+
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I. Basic Information for CVE-2026-31851
Vulnerability Information
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Vulnerability Title
Lack of Rate Limiting Enables Brute-Force Attacks in Nexxt Nebula 300+
Source: NVD (National Vulnerability Database)
Vulnerability Description
Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 does not implement rate limiting or account lockout mechanisms on authentication interfaces. An attacker can perform unlimited authentication attempts against endpoints that rely on credential validation, enabling brute-force attacks to guess administrative credentials without restriction.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
过多认证尝试的限制不恰当
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，该漏洞源于身份验证接口缺少速率限制或账户锁定，可能导致暴力破解攻击。
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 | - |
II. Public POCs for CVE-2026-31851
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2026-31847 | Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Neb | |
| 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+ |
IV. Related Vulnerabilities
Same product: Nebula 300+
Same vendor: Nexxt Solutions
- 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-2026-31847
Hidden Functionality Enables Remote Telnet Activation via /g - CVE-2026-31846
Unauthenticated Credential Disclosure via /goform/ate in Nex
Same weakness: CWE-307
- CVE-2026-41893
Signal K Server's WebSocket Login Endpoint Lacks Rate Limiti - CVE-2025-2514
Improper Restriction of Excessive Authentication Attempts vu - CVE-2023-54347
OpenEMR 7.0.1 Authentication Brute Force Mitigation Bypass - CVE-2026-7671
CodeWise Tornet Scooter Mobile App TwoFactor excessive authe - CVE-2026-26206
Wazuh: API brute-force protection bypass via race condition
V. Comments for CVE-2026-31851
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