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Vulnerability record · CVE-2026-31851 · published 23 March 2026

CVE-2026-31851: Nexxtsolutions nebula300plus firmware improper restriction of authentication attempts vulnerability

NNexxtsolutions · Nebula300plus Firmware

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.

7.7 CVSS 4.0 High EPSS 0.67% · top 50.0% CWE-307 · Improper restriction of authentication attempts
7.7CVSS 4.0 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

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.

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/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip Product
https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/ Product

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.7CVE-2026-31848Nexxtsolutions nebula300plus firmware cleartext storage of sensitive data vulnerabilityNexxt Solutions Nebula 300+ firmware through version 12.01.01.37 uses the ecos_pw cookie for authentication, which contains Base64-encoded credential…EPSS 0.46%8.5CVE-2026-31847Nexxtsolutions nebula300plus firmware vulnerabilityHidden functionality in the /goform/setSysTools endpoint in Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 allows remote enablement…EPSS 0.68%7.2CVE-2026-31849Nexxtsolutions nebula300plus firmware cross-site request forgery vulnerabilityNexxt Solutions Nebula 300+ firmware through version 12.01.01.37 does not implement CSRF protections on state-changing endpoints such as /goform/setS…EPSS 0.17%6.8CVE-2026-31850Nexxtsolutions nebula300plus firmware vulnerabilityNexxt Solutions Nebula 300+ firmware through version 12.01.01.37 stores sensitive information, including administrative credentials and WiFi pre-shar…EPSS 0.27%

Source: NIST National Vulnerability Database (record CVE-2026-31851), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.