CVE-2026-31851 PUBLISHED

Lack of rate limiting allows brute-force attacks in Nexxt Nebula 300+

Assigner: TuranSec
Reserved: 09.03.2026 Published: 23.03.2026 Updated: 23.03.2026

Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 does not implement rate limiting or account lockout on the authentication interface.

CVSS Vector: 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
CVSS Score: 7.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Adjacent	Confidentiality	High	Confidentiality	None
Attack Complexity	High	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Vendor	Nexxt Solutions
Product	Nebula 300+
Versions	Default: unaffected Version <= 12.01.01.37 is affected

An attacker can perform unlimited authentication attempts, enabling brute-force attacks against administrative credentials.