Nexxt Solutions Nebula 300+ up to 12.01.01.37 Authentication Interface excessive authentication

Summaryinfo

A vulnerability was found in Nexxt Solutions Nebula 300+ up to 12.01.01.37. It has been classified as problematic. Impacted is an unknown function of the component Authentication Interface. The manipulation leads to excessive authentication. This vulnerability is documented as CVE-2026-31851. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Nexxt Solutions Nebula 300+ up to 12.01.01.37. It has been rated as problematic. This issue affects an unknown code block of the component Authentication Interface. The manipulation with an unknown input leads to a excessive authentication vulnerability. Using CWE to declare the problem leads to CWE-307. The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame, making it more susceptible to brute force attacks. Impacted is confidentiality. The summary by CVE is:

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.

The weakness was released by Angel Barre. It is possible to read the advisory at nexxtsolutions.com. The identification of this vulnerability is CVE-2026-31851 since 03/09/2026. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1110.001 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Nexxt Solutions

Name

• Nebula 300+

Version

• 12.01.01.0
• 12.01.01.1
• 12.01.01.2
• 12.01.01.3
• 12.01.01.4
• 12.01.01.5
• 12.01.01.6
• 12.01.01.7
• 12.01.01.8
• 12.01.01.9
• 12.01.01.10
• 12.01.01.11
• 12.01.01.12
• 12.01.01.13
• 12.01.01.14
• 12.01.01.15
• 12.01.01.16
• 12.01.01.17
• 12.01.01.18
• 12.01.01.19
• 12.01.01.20
• 12.01.01.21
• 12.01.01.22
• 12.01.01.23
• 12.01.01.24
• 12.01.01.25
• 12.01.01.26
• 12.01.01.27
• 12.01.01.28
• 12.01.01.29
• 12.01.01.30
• 12.01.01.31
• 12.01.01.32
• 12.01.01.33
• 12.01.01.34
• 12.01.01.35
• 12.01.01.36
• 12.01.01.37

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