Answer in brief
CVE-2026-31847 records a Unknown severity vulnerability in Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Nebula 300+. The current sources do not mark it as known exploited. The current feed maps Nexxt Solutions/Nebula 300+ (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Nexxt Solutions/Nebula 300+ (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Nexxt Solutions/Nebula 300+generic | <= 12.01.01.37 | Not reported |
Published upstream
Mar 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 10, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-31847 records a Unknown severity vulnerability in Hidden Functionality Enables Remote Telnet Activation via /goform/setSysTools in Nexxt Nebula 300+. The current sources do not mark it as known exploited. The current feed maps Nexxt Solutions/Nebula 300+ (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Nexxt Solutions/Nebula 300+ (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Nexxt Solutions/Nebula 300+generic | <= 12.01.01.37 | Not reported |
Published upstream
Mar 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 10, 2026
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.
Quoted source text, attributed separately from HOL analysis.