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

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Summary

CVECVE-2026-31851
StatePUBLISHED
AssignerTuranSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-23 13:16:30 UTC
Updated2026-04-29 17:37:36 UTC
DescriptionNexxt 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.

Risk And Classification

Primary CVSS: v4.0 7.7 HIGH from 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c

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:X/V:X/RE:X/U:X

EPSS: 0.000900000 probability, percentile 0.252980000 (date 2026-05-02)

Problem Types: CWE-307 | CWE-307 CWE-307 Improper Restriction of Excessive Authentication Attempts

VersionSourceTypeScoreSeverityVector
4.0309f9ea4-e3e9-4c6c-b79d-e8eb01244f2cSecondary7.7HIGHCVSS: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/C...
4.0CNACVSS7.7HIGHCVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0 Breakdown

Attack Vector
Adjacent
Attack Complexity
High
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Hardware Nexxtsolutions Nebula300plus - All All All
Operating System Nexxtsolutions Nebula300plus Firmware All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Nexxt Solutions Nebula 300 affected <= 12.01.01.37 Not specified

References

ReferenceSourceLinkTags
www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c www.nexxtsolutions.com Product
nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c nexxt-connectivity-frontend.s3.amazonaws.com Product
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Angel Barre (call4pwn) (en)

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