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CVE-2026-31851— Nexxt Nebula 300+ - Lack of Rate Limiting Enables Brute-Force Attacks

Quick assessment

Affected
Nexxt Solutions Nebula 300+
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.7 · High EPSS 0.67% · P51

Possible ATT&CK Techniques 1 AI

T1110 · Brute Force

Affected Version Matrix 1

VendorProduct Version RangeStatus
Nexxt Solutions Nebula 300+ <= 12.01.01.37 affected
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I. Basic Information for CVE-2026-31851

Vulnerability Information
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Vulnerability Title
Nexxt Nebula 300+ - Lack of Rate Limiting Enables Brute-Force Attacks
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
过多认证尝试的限制不恰当
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-31851

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Vendor Pages for CVE-2026-31851 (1)

Other References for CVE-2026-31851 (1)

Same Patch Batch · Nexxt Solutions · 2026-03-23 · 6 CVEs total

CVE-2026-31848 8.7 HIGH Reversible ecos_pw Cookie Allows Authentication Bypass in Nexxt Nebula 300+
CVE-2026-31847 8.5 HIGH Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Neb
CVE-2026-31849 7.2 HIGH Missing CSRF Protection on Administrative Endpoints in Nexxt Nebula 300+
CVE-2026-31850 6.8 MEDIUM Plaintext Storage of Credentials in Configuration Backup in Nexxt Nebula 300+
CVE-2026-31846 6.5 MEDIUM Unauthenticated Credential Disclosure via /goform/ate in Nexxt Nebula 300+

IV. Related Vulnerabilities

Same product: Nebula 300+
Same vendor: Nexxt Solutions
Same weakness: CWE-307

V. Comments for CVE-2026-31851

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