CVE-2026-57020

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cause a Denial-of-Service (DoS).\n\nOn all QFX10000 platforms in an EVPN-VxLAN scenario, if an attacker sends IPv6 multicast traffic and these packets reach the non-IRB interface of a spine switch it floods the packet to other spines and all Ethernet Segment Identifier (ESI)\u00a0leaf switches. This flooding causes the packet to be forwarded in a endless loop, which can lead to saturation of the involved links and in turn impact to legitimate traffic.\n\n\n\nThis issue affects Junos OS on QFX10000 Series:\n\n\n * all versions before 23.2R2-S7,\n * 23.4 versions before 23.4R2-S8,\n * 24.2 versions before 24.2R2-S4,\n * 24.4 versions before 24.4R2-S4.\n\n\n\nThis issue does not affect Junos version after 24.4 as the QFX10000 Series devices are not supported on newer versions anymore."}, {"lang": "es", "value": "Una vulnerabilidad de Comprobaci\u00f3n Incorrecta de Condiciones Inusuales o Excepcionales en el motor de reenv\u00edo de paquetes (pfe) de Juniper Networks Junos OS en la serie QFX10000 permite a un atacante adyacente no autenticado causar una Denegaci\u00f3n de Servicio (DoS).\n\nEn todas las plataformas QFX10000 en un escenario EVPN-VxLAN, si un atacante env\u00eda tr\u00e1fico multicast IPv6 y estos paquetes alcanzan la interfaz no-IRB de un switch spine, inunda el paquete a otros spines y a todos los switches leaf de Identificador de Segmento Ethernet (ESI). Esta inundaci\u00f3n provoca que el paquete sea reenviado en un bucle sin fin, lo que puede llevar a la saturaci\u00f3n de los enlaces involucrados y, a su vez, a un impacto en el tr\u00e1fico leg\u00edtimo.\n\nEste problema afecta a Junos OS en la serie QFX10000:\n\n* todas las versiones anteriores a 23.2R2-S7,\n* versiones 23.4 anteriores a 23.4R2-S8,\n* versiones 24.2 anteriores a 24.2R2-S4,\n* versiones 24.4 anteriores a 24.4R2-S4.\n\nEste problema no afecta a las versiones de Junos posteriores a 24.4, ya que los dispositivos de la serie QFX10000 ya no son compatibles con versiones m\u00e1s recientes."}], "id": "CVE-2026-57020", "lastModified": "2026-10-25T15:10:00.147", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "sirt@juniper.net", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "YES", "Recovery": "USER", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "ADJACENT", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.1, "baseSeverity": "HIGH", "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": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/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:Y/R:U/V:X/RE:M/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "MODERATE"}, "source": "sirt@juniper.net", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-57020", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-10T13:28:54.914596Z", "version": "2.0.3"}}]}, "published": "2026-07-09T22:17:06.887", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://supportportal.juniper.net/JSA110080"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-754"}], "source": "sirt@juniper.net", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["qfx10000_series"], "status": "affected", "versions": {"scheme": "generic", "value": "[0,23.2R2-S7)"}}, {"platform": ["qfx10000_series"], "status": "affected", "versions": {"scheme": "generic", "value": "[23.4,23.4R2-S8)"}}, {"platform": ["qfx10000_series"], "status": "affected", "versions": {"scheme": "generic", "value": "[24.2,24.2R2-S4)"}}, {"platform": ["qfx10000_series"], "status": "affected", "versions": {"scheme": "generic", "value": "[24.4,24.4R2-S4)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Junos OS", "source": "cna", "vendor": "Juniper Networks"}, "product": "junos_os", "vendor": "juniper_networks"}], "created": "2026-07-09T22:30:05.352622+00:00", "updated": "2026-08-01T14:00:06.207733+00:00", "vendors": ["juniper_networks", "juniper_networks$PRODUCT$junos_os"]}