CVE-2026-57019

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This causes further packet processing to fail, which triggers an FPC major error, resulting in a FPC reset impacting traffic until the FPC has automatically recovered.\n\nAffected scenarios are: MAP-T, or non-IP traffic encapsulated in IP (e.g. MPLS over GRE).\n\nWhen this issue happens the following logs can be observed:\n\nfpc<#> CMError: /fpc/0/pfe/0/cm/0/MQSS(0)/0/MQSS_CMERROR_LI_INT_REG_UNROLL_TAIL_LENGTH_OVF (0x2205eb), scope: pfe, category: functional, severity: major, module: MQSS(0), type: LI: Unroll TAIL length overflow, oc_category: default\nfpc<#> Performing action reset-fru for error /fpc/0/pfe/0/cm/0/MQSS(0)/0/MQSS_CMERROR_LI_INT_REG_UNROLL_TAIL_LENGTH_OVF (0x2205eb) in module: MQSS(0) with scope: pfe category: functional level: major, oc_category: default\n\n\n\n\nThis issue affects Junos OS on MX Series:\n\n\n * all versions before 23.2R2-S6,\n * 23.4 versions before 23.4R2-S7,\n * 24.2 versions before 24.2R2-S4,\n * 24.4 versions before 24.4R2-S4,\n * 25.2 versions before 25.2R2.", "supportingMedia": [{"type": "text/html", "value": "An Improper Validation of Specified Quantity in Input 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).<br><p>\n\nWhen a specific packet is received from device in the same broadcast domain, an affected system calculates the packet size incorrectly. This causes further packet processing to fail, which triggers an FPC major error, resulting in a FPC reset impacting traffic until the FPC has automatically recovered.</p><p>Affected scenarios are: MAP-T, or non-IP traffic encapsulated in IP (e.g. MPLS over GRE).</p><p>When this issue happens the following logs can be observed:</p><tt>fpc&lt;#&gt; CMError: /fpc/0/pfe/0/cm/0/MQSS(0)/0/MQSS_CMERROR_LI_INT_REG_UNROLL_TAIL_LENGTH_OVF (0x2205eb), scope: pfe, category: functional, severity: major, module: MQSS(0), type: LI: Unroll TAIL length overflow, oc_category: default<br></tt><tt>fpc&lt;#&gt; Performing action reset-fru for error /fpc/0/pfe/0/cm/0/MQSS(0)/0/MQSS_CMERROR_LI_INT_REG_UNROLL_TAIL_LENGTH_OVF (0x2205eb) in module: MQSS(0) with scope: pfe category: functional level: major, oc_category: default</tt><p>\n\n<br></p><p>This issue affects Junos OS on MX Series:<br></p><ul><li>all versions before 23.2R2-S6,</li><li>23.4 versions before 23.4R2-S7,</li><li>24.2 versions before 24.2R2-S4,</li><li>24.4 versions before 24.4R2-S4,</li><li>25.2 versions before 25.2R2.</li></ul><br><p></p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-1284", "description": "CWE-1284 Improper Validation of Specified Quantity in Input"}]}], "providerMetadata": {"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper", "dateUpdated": "2026-07-09T21:04:41.927Z"}}}, "cveMetadata": {"cveId": "CVE-2026-57019", "state": "PUBLISHED", "dateUpdated": "2026-07-10T13:29:55.755Z", "dateReserved": "2026-06-23T16:27:00.248Z", "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "datePublished": "2026-07-09T21:04:41.927Z", "assignerShortName": "juniper"}, "dataVersion": "5.2"}

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This causes further packet processing to fail, which triggers an FPC major error, resulting in a FPC reset impacting traffic until the FPC has automatically recovered.\n\nAffected scenarios are: MAP-T, or non-IP traffic encapsulated in IP (e.g. MPLS over GRE).\n\nWhen this issue happens the following logs can be observed:\n\nfpc<#> CMError: /fpc/0/pfe/0/cm/0/MQSS(0)/0/MQSS_CMERROR_LI_INT_REG_UNROLL_TAIL_LENGTH_OVF (0x2205eb), scope: pfe, category: functional, severity: major, module: MQSS(0), type: LI: Unroll TAIL length overflow, oc_category: default\nfpc<#> Performing action reset-fru for error /fpc/0/pfe/0/cm/0/MQSS(0)/0/MQSS_CMERROR_LI_INT_REG_UNROLL_TAIL_LENGTH_OVF (0x2205eb) in module: MQSS(0) with scope: pfe category: functional level: major, oc_category: default\n\n\n\n\nThis issue affects Junos OS on MX Series:\n\n\n * all versions before 23.2R2-S6,\n * 23.4 versions before 23.4R2-S7,\n * 24.2 versions before 24.2R2-S4,\n * 24.4 versions before 24.4R2-S4,\n * 25.2 versions before 25.2R2."}, {"lang": "es", "value": "Una vulnerabilidad de Validaci\u00f3n Incorrecta de Cantidad Especificada en la Entrada 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).\n\nCuando se recibe un paquete espec\u00edfico de un dispositivo en el mismo dominio de difusi\u00f3n, un sistema afectado calcula el tama\u00f1o del paquete incorrectamente. Esto hace que el procesamiento posterior de paquetes falle, lo que desencadena un error mayor de FPC, resultando en un reinicio de FPC que afecta el tr\u00e1fico hasta que el FPC se haya recuperado autom\u00e1ticamente.\n\nLos escenarios afectados son: MAP-T, o tr\u00e1fico no IP encapsulado en IP (por ejemplo, MPLS sobre GRE).\n\nCuando ocurre este problema, se pueden observar los siguientes registros:\n\nfpc<#> CMError: /fpc/0/pfe/0/cm/0/MQSS(0)/0/MQSS_CMERROR_LI_INT_REG_UNROLL_TAIL_LENGTH_OVF (0x2205eb), alcance: pfe, categor\u00eda: funcional, gravedad: mayor, m\u00f3dulo: MQSS(0), tipo: LI: Desbordamiento de longitud de COLA de desenrollado, oc_categor\u00eda: predeterminada\nfpc<#> Realizando acci\u00f3n reset-fru para el error /fpc/0/pfe/0/cm/0/MQSS(0)/0/MQSS_CMERROR_LI_INT_REG_UNROLL_TAIL_LENGTH_OVF (0x2205eb) en el m\u00f3dulo: MQSS(0) con alcance: pfe categor\u00eda: funcional nivel: mayor, oc_categor\u00eda: predeterminada\n\nEste problema afecta a Junos OS en la Serie MX:\n\n * todas las versiones anteriores a 23.2R2-S6,\n * versiones 23.4 anteriores a 23.4R2-S7,\n * versiones 24.2 anteriores a 24.2R2-S4,\n * versiones 24.4 anteriores a 24.4R2-S4,\n * versiones 25.2 anteriores a 25.2R2."}], "id": "CVE-2026-57019", "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": "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-2026-57019", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-10T13:29:42.438982Z", "version": "2.0.3"}}]}, "published": "2026-07-09T22:17:06.707", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://supportportal.juniper.net/JSA110079"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1284"}], "source": "sirt@juniper.net", "type": "Secondary"}]}

{}

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