CVE-2026-21902

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With the ability to access and manipulate the service to execute code as root a remote attacker can take complete control of the device.<br>Please note that this service is enabled by default as no specific configuration is required.<br><br><p>This issue affects Junos OS Evolved on PTX Series:</p><p></p><ul><li>25.4 versions before 25.4R1-S1-EVO, 25.4R2-EVO.</li></ul><p></p>This issue does not affect Junos OS Evolved versions before 25.4R1-EVO.<br><br>This issue does not affect Junos OS."}], "value": "An Incorrect Permission Assignment for Critical Resource vulnerability in the On-Box Anomaly detection framework of Juniper Networks Junos OS Evolved on PTX Series allows an unauthenticated, network-based attacker to execute code as root.\n\nThe On-Box Anomaly detection framework should only be reachable by other internal processes over the internal routing instance, but not over an externally exposed port. 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With the ability to access and manipulate the service to execute code as root a remote attacker can take complete control of the device.\nPlease note that this service is enabled by default as no specific configuration is required.\n\nThis issue affects Junos OS Evolved on PTX Series:\n\n\n\n * 25.4 versions before 25.4R1-S1-EVO, 25.4R2-EVO.\n\n\n\n\nThis issue does not affect Junos OS Evolved versions before 25.4R1-EVO.\n\nThis issue does not affect Junos OS."}, {"lang": "es", "value": "Una vulnerabilidad de Asignaci\u00f3n Incorrecta de Permisos para Recursos Cr\u00edticos en el framework de detecci\u00f3n de anomal\u00edas On-Box de Juniper Networks Junos OS Evolved en la serie PTX permite a un atacante no autenticado y basado en red ejecutar c\u00f3digo como root.\n\nEl framework de detecci\u00f3n de anomal\u00edas On-Box solo deber\u00eda ser accesible por otros procesos internos a trav\u00e9s de la instancia de enrutamiento interna, pero no a trav\u00e9s de un puerto expuesto externamente. Con la capacidad de acceder y manipular el servicio para ejecutar c\u00f3digo como root, un atacante remoto puede tomar el control completo del dispositivo.\nTenga en cuenta que este servicio est\u00e1 habilitado por defecto ya que no se requiere ninguna configuraci\u00f3n espec\u00edfica.\n\nEste problema afecta a Junos OS Evolved en la serie PTX:\n\n * versiones 25.4 anteriores a 25.4R1-S1-EVO, 25.4R2-EVO.\n\nEste problema no afecta a las versiones de Junos OS Evolved anteriores a 25.4R1-EVO.\n\nEste problema no afecta a Junos OS."}], "id": "CVE-2026-21902", "lastModified": "2026-06-17T10:19:07.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "sirt@juniper.net", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "YES", "Recovery": "USER", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.3, "baseSeverity": "CRITICAL", "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": "RED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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:Red", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "MODERATE"}, "source": "sirt@juniper.net", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-21902", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-02-25T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-02-25T18:23:40.360", "references": [{"source": "sirt@juniper.net", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://kb.juniper.net/JSA107128"}, {"source": "sirt@juniper.net", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://supportportal.juniper.net/JSA107128"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Product"], "url": "https://github.com/watchtowrlabs/watchTowr-vs-JunosEvolved-CVE-2026-21902/blob/main/watchTowr-vs-JunosEvolved-CVE-2026-21902.py"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-732"}], "source": "sirt@juniper.net", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["ptx_series"], "status": "affected", "versions": {"scheme": "generic", "value": "[25.4,25.4R1-S1-EVO)"}}, {"platform": ["ptx_series"], "status": "affected", "versions": {"scheme": "generic", "value": "[25.4,25.4R2-EVO)"}}, {"platform": ["ptx_series"], "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,25.4R1-EVO)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Junos OS Evolved", "source": "cna", "vendor": "Juniper Networks"}, "product": "junos_os_evolved", "vendor": "juniper_networks"}], "created": "2026-02-26T13:15:15.491687+00:00", "updated": "2026-06-18T04:45:15.688854+00:00", "vendors": ["juniper_networks", "juniper_networks$PRODUCT$junos_os_evolved"]}