PT-2026-27114 · Nexxt Solutions · Nebula 300+

Angel Barre · Published 2026-03-23 · Updated 2026-03-23 · CVE-2026-31847

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:L/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 A hidden functionality within the /goform/setSysTools endpoint allows remote activation of a Telnet service. Enabling this service exposes a privileged diagnostic management interface over the network, expanding the attack surface and potentially leading to further compromise of the device. The vulnerable endpoint is /goform/setSysTools.

Recommendations Versions prior to 12.01.01.38 should be updated.

Fix

Hidden Functionality

Weakness Enumeration

CWE-912

Related Identifiers

CVE-2026-31847

Affected Products

Nebula 300+

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-31847 · Security Note
• https://nexxtsolutions.com/connectivity/internal-products/ARN02304U6 · Note
• https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip · Note
• https://twitter.com/VulmonFeeds/status/2036139901855367365 · Twitter Post