CVE-2026-31847 | Nexxt Solutions Nebula 300+ up to 12.01.01.37 Telnet Service /goform/setSysTools backdoor

VDB-352506 · CVE-2026-31847 · GCVE-0-2026-31847 NEXXT SOLUTIONS NEBULA 300+ UP TO 12.01.01.37 TELNET SERVICE /GOFORM/SETSYSTOOLS BACKDOOR HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 8.8 $0-$5k 6.15+ Summaryinfo A vulnerability classified as critical was found in Nexxt Solutions Nebula 300+ up to 12.01.01.37. Affected by this vulnerability is an unknown functionality of the file /goform/setSysTools of the component Telnet Service. The manipulation results in backdoor. This vulnerability is identified as CVE-2026-31847. The attack can only be performed from the local network. There is not any exploit available. Detailsinfo A vulnerability, which was classified as critical, was found in Nexxt Solutions Nebula 300+ up to 12.01.01.37. Affected is an unknown function of the file /goform/setSysTools of the component Telnet Service. The manipulation with an unknown input leads to a backdoor vulnerability. CWE is classifying the issue as CWE-912. The product contains functionality that is not documented, not part of the specification, and not accessible through an interface or command sequence that is obvious to the product's users or administrators. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes: Hidden functionality in the /goform/setSysTools endpoint in Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 allows remote enablement of a Telnet service. Once enabled, the service exposes a privileged diagnostic management interface over the network, increasing the attack surface and enabling further compromise of the device. The weakness was released by Angel Barre. The advisory is available at nexxtsolutions.com. This vulnerability is traded as CVE-2026-31847 since 03/09/2026. The exploitability is told to be easy. The attack needs to approached within the local network. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 03/23/2026). This vulnerability is assigned to T1588.001 by the MITRE ATT&CK project. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. 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 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 8.8 VulDB Meta Temp Score: 8.8 VulDB Base Score: 8.8 VulDB Temp Score: 8.8 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Backdoor CWE: CWE-912 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Partially Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 03/09/2026 CVE reserved 03/23/2026 +14 days Advisory disclosed 03/23/2026 +0 days VulDB entry created 03/23/2026 +0 days VulDB entry last update Sourcesinfo Advisory: nexxtsolutions.com Researcher: Angel Barre Status: Not defined CVE: CVE-2026-31847 (🔒) GCVE (CVE): GCVE-0-2026-31847 GCVE (VulDB): GCVE-100-352506 Entryinfo Created: 03/23/2026 13:58 Changes: 03/23/2026 13:58 (67) Complete: 🔍 Cache ID: 99:7E2:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸