by Kastro
Paper/Archive/CVE-2026-31851

CVE-2026-31851

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

EPSS 0.3%CVSS 9.8
critical.is priorityof 100
35
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 28.6.286 × 205.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Nebula 300+<= 12.01.01.37–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
TuranSec (CNA)7.7CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

writeupnexxtsolutions.com/connectivity/internal-products/ARN02304U6writeupnexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip