CVE-2026-31851

Nexxt Nebula 300+ - Lack of Rate Limiting Enables Brute-Force Attacks

State: Published
Severity: 7.7 High
Published: Mar 23, 2026
Updated: Aug 10, 2026
Reserved: Mar 9, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.7 High	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	TuranSec

Weaknesses

CWE-307 Improper Restriction of Excessive Authentication Attempts

Affected Products

Product	Versions
Nebula 300+Nexxt Solutions	<= 12.01.01.37Affected

References

https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/third-party-advisory
https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zipthird-party-advisory

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