PT-2026-27118 · Nexxt Solutions · Nebula 300+

Angel Barre · Published 2026-03-23 · Updated 2026-03-23 · CVE-2026-31851

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Nexxt Solutions Nebula 300+ firmware versions through 12.01.01.37

Description The authentication interface of Nexxt Solutions Nebula 300+ firmware does not enforce rate limiting or account lockout mechanisms. This allows for potential brute-force attacks against the authentication system.

Recommendations Update to a version beyond 12.01.01.37.

Fix

Improper Restriction of Excessive Authentication Attempts

Weakness Enumeration

CWE-307

Related Identifiers

CVE-2026-31851

Affected Products

Nebula 300+

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-31851 · Security Note
• https://twitter.com/VulmonFeeds/status/2036132222281883790 · Twitter Post
• https://nexxtsolutions.com/connectivity/internal-products/ARN02304U6 · Note
• https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip · Note