CVE-2026-33800

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Especially in a <span style=\"background-color: rgb(255, 255, 255);\">Virtual-Chassis (VC) scenario with&nbsp;locality\u2011bias configured,&nbsp;</span>processing takes a significant amount of time for each event.&nbsp;If these sessions keep flapping, new events are constantly added, and in turn PFEMAN never completes processing these events. This results in the PFEMAN watchdog timer expiring, which causes the FPC to crash and restart, representing a complete service outage.</span><br></p><p>This issue only affects MX series FPCs up to and including MPC9, and&nbsp;LC2101/2103 and LC480.&nbsp;It does not affect MPC10/11, LC4800/9600, and MX304.</p><p>This issue affects Junos OS on MX Series:<br></p><ul><li>all versions before 23.2R2-S7,</li><li>23.4 versions before 23.4R2-S8,</li><li>24.2 versions before 24.2R2-S4,</li><li>24.4 versions before 24.4R2-S3,</li><li>25.2 versions before 25.2R2.</li></ul><br><p></p>"}], "value": "An Unchecked Input for Loop Condition vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on MX Series allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS).Micro-BFD session flaps generate respective up/down events which are queued by PFEMAN for processing. 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This results in the PFEMAN watchdog timer expiring, which causes the FPC to crash and restart, representing a complete service outage.\n\n\nThis issue only affects MX series FPCs up to and including MPC9, and\u00a0LC2101/2103 and LC480.\u00a0It does not affect MPC10/11, LC4800/9600, and MX304.\n\nThis issue affects Junos OS on MX 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-S3,\n * 25.2 versions before 25.2R2.", "supportingMedia": [{"type": "text/html", "value": "An Unchecked Input for Loop Condition vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on MX Series allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS).<p><span style=\"background-color: rgb(255, 255, 255);\">Micro-BFD session flaps generate respective up/down events which are queued by PFEMAN for processing. 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Especially in a Virtual-Chassis (VC) scenario with\u00a0locality\u2011bias configured,\u00a0processing takes a significant amount of time for each event.\u00a0If these sessions keep flapping, new events are constantly added, and in turn PFEMAN never completes processing these events. This results in the PFEMAN watchdog timer expiring, which causes the FPC to crash and restart, representing a complete service outage.\n\n\nThis issue only affects MX series FPCs up to and including MPC9, and\u00a0LC2101/2103 and LC480.\u00a0It does not affect MPC10/11, LC4800/9600, and MX304.\n\nThis issue affects Junos OS on MX 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-S3,\n * 25.2 versions before 25.2R2."}, {"lang": "es", "value": "Una vulnerabilidad de Condici\u00f3n de Bucle con Entrada No Verificada en el Motor de Reenv\u00edo de Paquetes (pfe) de Juniper Networks Junos OS en la Serie MX permite a un atacante adyacente no autenticado causar una Denegaci\u00f3n de Servicio (DoS). Las fluctuaciones de sesi\u00f3n de Micro-BFD generan eventos de subida/bajada respectivos que son encolados por PFEMAN para su procesamiento. Especialmente en un escenario de Chasis Virtual (VC) con sesgo de localidad configurado, el procesamiento lleva una cantidad significativa de tiempo para cada evento. Si estas sesiones siguen fluctuando, se a\u00f1aden constantemente nuevos eventos, y a su vez PFEMAN nunca completa el procesamiento de estos eventos. Esto resulta en la expiraci\u00f3n del temporizador de vigilancia de PFEMAN, lo que provoca que la FPC se bloquee y reinicie, lo que representa una interrupci\u00f3n completa del servicio.\n\nEste problema solo afecta a las FPC de la serie MX hasta e incluyendo MPC9. No afecta a MPC10/11, LC4800/9600 y MX304.\n\nEste problema afecta a Junos OS en la Serie MX:\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-S3,\n * versiones 25.2 anteriores a 25.2R2."}], "id": "CVE-2026-33800", "lastModified": "2026-10-25T17:10:00.197", "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": "AUTOMATIC", "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:A/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-2026-33800", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-10T13:31:18.681766Z", "version": "2.0.3"}}]}, "published": "2026-07-09T21:16:55.163", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://supportportal.juniper.net/JSA110075"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-606"}], "source": "sirt@juniper.net", "type": "Secondary"}]}

{}

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