CVE-2025-66023

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Version 0.34.5 contains a patch. The patch enforces stricter protocol adherence in the MQTT client SDK embedded in NanoMQ. Specifically, it ensures that CONNACK is always the first packet processed in the line. This prevents the state confusion that led to the Heap-Use-After-Free (UAF) when a malicious server sent a malformed packet sequence immediately after connection establishment. As a workaround, validate the remote broker before bridging."}, {"lang": "es", "value": "NanoMQ MQTT Broker (NanoMQ) es una plataforma de mensajer\u00eda Edge integral. Las versiones anteriores a la 0.24.5 tienen una vulnerabilidad de uso despu\u00e9s de liberaci\u00f3n (UAF) de heap dentro del componente cliente de puente MQTT (implementada a trav\u00e9s de la biblioteca NanoNNG subyacente). La vulnerabilidad se activa cuando NanoMQ act\u00faa como un puente que se conecta a un broker MQTT remoto. Un broker remoto malicioso puede provocar un fallo (denegaci\u00f3n de servicio) o una posible corrupci\u00f3n de memoria al aceptar la conexi\u00f3n y enviar inmediatamente una secuencia de paquetes malformada. La versi\u00f3n 0.34.5 contiene un parche. El parche impone una adherencia m\u00e1s estricta al protocolo en el SDK de cliente MQTT incrustado en NanoMQ. Espec\u00edficamente, asegura que CONNACK sea siempre el primer paquete procesado en la l\u00ednea. Esto evita la confusi\u00f3n de estado que llev\u00f3 al uso despu\u00e9s de liberaci\u00f3n (UAF) de heap cuando un servidor malicioso envi\u00f3 una secuencia de paquetes malformada inmediatamente despu\u00e9s del establecimiento de la conexi\u00f3n. Como soluci\u00f3n alternativa, valide el broker remoto antes de establecer el puente."}], "id": "CVE-2025-66023", "lastModified": "2026-06-17T09:56:11.607", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 4.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.2, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "HIGH", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-66023", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-05T20:04:24.756709Z", "version": "2.0.3"}}]}, "published": "2026-01-01T15:15:41.580", "references": [{"source": "security-advisories@github.com", "tags": ["Issue Tracking", "Patch"], "url": "https://github.com/nanomq/NanoNNG/pull/1365"}, {"source": "security-advisories@github.com", "tags": ["Issue Tracking"], "url": "https://github.com/nanomq/nanomq/issues/2145"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/nanomq/nanomq/security/advisories/GHSA-24f7-q5hh-27hf"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

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