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Vulnerability Details :

CVE-2026-31847

Summary
Assigner-TuranSec
Assigner Org ID-309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
Published At-23 Mar, 2026 | 12:07
Updated At-26 Mar, 2026 | 10:52
Rejected At-
Credits

Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Nebula 300+

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. By sending a crafted POST request with parameters such as telnetManageEn=true and telnetPwd, an authenticated attacker can activate a Telnet service on port 23. This exposes a privileged diagnostic interface that is not intended for external access and can be used to interact with the underlying system.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:TuranSec
Assigner Org ID:309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
Published At:23 Mar, 2026 | 12:07
Updated At:26 Mar, 2026 | 10:52
Rejected At:
▼CVE Numbering Authority (CNA)
Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Nebula 300+

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. By sending a crafted POST request with parameters such as telnetManageEn=true and telnetPwd, an authenticated attacker can activate a Telnet service on port 23. This exposes a privileged diagnostic interface that is not intended for external access and can be used to interact with the underlying system.

Affected Products
Vendor
Nexxt Solutions
Product
Nebula 300+
Default Status
unaffected
Versions
Affected
  • From <= 12.01.01.37 through Nebula300+_v12.01.01.37 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-912CWE-912 Hidden Functionality
Type: CWE
CWE ID: CWE-912
Description: CWE-912 Hidden Functionality
Metrics
VersionBase scoreBase severityVector
4.08.5HIGH
CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Version: 4.0
Base score: 8.5
Base severity: HIGH
Vector:
CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Metrics Other Info
Impacts
CAPEC IDDescription
N/AAn attacker who can invoke the affected functionality can enable a privileged Telnet service remotely, exposing a diagnostic management interface and enabling further compromise of the device.
CAPEC ID: N/A
Description: An attacker who can invoke the affected functionality can enable a privileged Telnet service remotely, exposing a diagnostic management interface and enabling further compromise of the device.
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Angel Barre (call4pwn)
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/
N/A
https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip
N/A
Hyperlink: https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/
Resource: N/A
Hyperlink: https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
Published At:23 Mar, 2026 | 13:16
Updated At:29 Apr, 2026 | 17:46

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. By sending a crafted POST request with parameters such as telnetManageEn=true and telnetPwd, an authenticated attacker can activate a Telnet service on port 23. This exposes a privileged diagnostic interface that is not intended for external access and can be used to interact with the underlying system.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.08.5HIGH
CVSS:4.0/AV:A/AC:L/AT:N/PR:H/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
Primary3.18.8HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Type: Secondary
Version: 4.0
Base score: 8.5
Base severity: HIGH
Vector:
CVSS:4.0/AV:A/AC:L/AT:N/PR:H/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
Type: Primary
Version: 3.1
Base score: 8.8
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CPE Matches
nexxtsolutions
nexxtsolutions
>>nebula300plus_firmware>>Versions up to 12.01.01.37(inclusive)
cpe:2.3:o:nexxtsolutions:nebula300plus_firmware:*:*:*:*:*:*:*:*
nexxtsolutions
nexxtsolutions
>>nebula300plus>>-
cpe:2.3:h:nexxtsolutions:nebula300plus:-:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-912Secondary309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
CWE ID: CWE-912
Type: Secondary
Source: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
Product
https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
Product
Hyperlink: https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip
Source: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
Resource:
Product
Hyperlink: https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/
Source: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c
Resource:
Product

Change History

0
Information is not available yet

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