CVE-2021-31354

{"containers": {"cna": {"affected": [{"product": "Junos OS", "vendor": "Juniper Networks", "versions": [{"lessThan": "19.2R1", "status": "unaffected", "version": "unspecified", "versionType": "custom"}, {"lessThan": "19.2R3-S3", "status": "affected", "version": "19.2", "versionType": "custom"}, {"lessThan": "19.3R3-S3", "status": "affected", "version": "19.3", "versionType": "custom"}, {"lessThan": "20.1R2-S2, 20.1R3-S1", "status": "affected", "version": "20.1", "versionType": "custom"}, {"lessThan": "20.2R3-S2", "status": "affected", "version": "20.2", "versionType": "custom"}, {"lessThan": "20.3R3", "status": "affected", "version": "20.3", "versionType": "custom"}, {"lessThan": "20.4R3", "status": "affected", "version": "20.4", "versionType": "custom"}, {"lessThan": "21.1R2", "status": "affected", "version": "21.1", "versionType": "custom"}]}, {"product": "Junos OS Evolved", "vendor": "Juniper Networks", "versions": [{"lessThan": "unspecified", "status": "affected", "version": "20.1R1-EVO", "versionType": "custom"}, {"lessThan": "21.2R2-EVO", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "configurations": [{"lang": "en", "value": "Systems vulnerable to this issue will have the Junos License Client set to Network Mode as follows:\n\n [system license network-mode]"}], "credits": [{"lang": "en", "value": "Juniper SIRT would like to acknowledge and thank The UK's National Cyber Security Centre (NCSC) for responsibly reporting this vulnerability."}], "datePublic": "2021-10-13T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "An Out Of Bounds (OOB) access vulnerability in the handling of responses by a Juniper Agile License (JAL) Client in Juniper Networks Junos OS and Junos OS Evolved, configured in Network Mode (to use Juniper Agile License Manager) may allow an attacker to cause a partial Denial of Service (DoS), or lead to remote code execution (RCE). The vulnerability exists in the packet parsing logic on the client that processes the response from the server using a custom protocol. An attacker with control of a JAL License Manager, or with access to the local broadcast domain, may be able to spoof a new JAL License Manager and/or craft a response to the Junos OS License Client, leading to exploitation of this vulnerability. This issue only affects Junos systems configured in Network Mode. Systems that are configured in Standalone Mode (the default mode of operation for all systems) are not vulnerable to this issue. This issue affects: Juniper Networks Junos OS: 19.2 versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R3-S3; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS Evolved: version 20.1R1-EVO and later versions, prior to 21.2R2-EVO. 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The vulnerability exists in the packet parsing logic on the client that processes the response from the server using a custom protocol. An attacker with control of a JAL License Manager, or with access to the local broadcast domain, may be able to spoof a new JAL License Manager and/or craft a response to the Junos OS License Client, leading to exploitation of this vulnerability. This issue only affects Junos systems configured in Network Mode. Systems that are configured in Standalone Mode (the default mode of operation for all systems) are not vulnerable to this issue. This issue affects: Juniper Networks Junos OS: 19.2 versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R3-S3; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS Evolved: version 20.1R1-EVO and later versions, prior to 21.2R2-EVO. 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The vulnerability exists in the packet parsing logic on the client that processes the response from the server using a custom protocol. An attacker with control of a JAL License Manager, or with access to the local broadcast domain, may be able to spoof a new JAL License Manager and/or craft a response to the Junos OS License Client, leading to exploitation of this vulnerability. This issue only affects Junos systems configured in Network Mode. Systems that are configured in Standalone Mode (the default mode of operation for all systems) are not vulnerable to this issue. This issue affects: Juniper Networks Junos OS: 19.2 versions prior to 19.2R3-S3; 19.3 versions prior to 19.3R3-S3; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R2. Juniper Networks Junos OS Evolved: version 20.1R1-EVO and later versions, prior to 21.2R2-EVO. This issue does not affect Juniper Networks Junos OS versions prior to 19.2R1."}, {"lang": "es", "value": "Una vulnerabilidad de acceso fuera de l\u00edmites (OOB) en el manejo de respuestas por parte de un cliente de Juniper Agile License (JAL) en Juniper Networks Junos OS y Junos OS Evolved, configurado en modo de red (para usar Juniper Agile License Manager) puede permitir a un atacante causar una Denegaci\u00f3n de Servicio (DoS) parcial o conllevar a una ejecuci\u00f3n remota de c\u00f3digo (RCE). La vulnerabilidad se presenta en la l\u00f3gica de an\u00e1lisis de paquetes en el cliente que procesa la respuesta del servidor usando un protocolo personalizado. Un atacante con el control de un Administrador de Licencias JAL, o con acceso al dominio de difusi\u00f3n local, puede ser capaz de falsificar un nuevo Administrador de Licencias JAL y/o dise\u00f1ar una respuesta al Cliente de Licencias del Sistema Operativo Junos, conllevando a una explotaci\u00f3n de esta vulnerabilidad. Este problema s\u00f3lo afecta a los sistemas Junos configurados en modo de red. Los sistemas configurados en modo aut\u00f3nomo (el modo de funcionamiento predeterminado para todos los sistemas) no son vulnerables a este problema. Este problema afecta a: Juniper Networks Junos OS: versiones 19.2 anteriores a 19.2R3-S3; versiones 19.3 anteriores a 19.3R3-S3; versiones 20.1 anteriores a 20.1R2-S2, 20.1R3-S1; versiones 20.2 anteriores a 20.2R3-S2; versiones 20.3 anteriores a 20.3R3; versiones 20.4 anteriores a 20.4R3; versiones 21.1 anteriores a 21.1R2. Juniper Networks Junos OS Evolved: versi\u00f3n 20.1R1-EVO y versiones posteriores, anteriores a 21.2R2-EVO. Este problema no afecta a las versiones de Juniper Networks Junos OS anteriores a 19.2R1"}], "id": "CVE-2021-31354", "lastModified": "2026-06-17T03:51:36.440", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "ADJACENT_NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.4, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:A/AC:M/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 5.5, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "LOW", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 5.5, "source": "sirt@juniper.net", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-10-19T19:15:08.777", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11219"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11219"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "sirt@juniper.net", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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