CVE-2021-0206

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By continuously sending these specific packets, an attacker can repeatedly disable the PFE causing a sustained Denial of Service (DoS). This issue only affects Juniper Networks NFX Series, SRX Series platforms when SSL Proxy is configured. This issue affects Juniper Networks Junos OS on NFX Series and SRX Series: 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R3-S1; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3; 19.2 versions prior to 19.2R1-S2, 19.2R2; 19.3 versions prior to 19.3R2. This issue does not affect Juniper Networks Junos OS versions on NFX Series and SRX Series prior to 18.3R1."}, {"lang": "es", "value": "Una vulnerabilidad de desreferencia del puntero NULL en Juniper Networks Junos OS permite a un atacante enviar un paquete espec\u00edfico causando que el motor de reenv\u00edo de paquetes (PFE) se bloquee y se reinicie, resultando en una Denegaci\u00f3n de Servicio (DoS). Mediante el env\u00edo continuamente de estos paquetes espec\u00edficos, un atacante puede desactivar repetidamente el PFE causando una Denegaci\u00f3n de Servicio (DoS) sostenida.&#xa0;Este problema solo afecta a las plataformas de la Serie NFX y Serie SRX de Juniper Networks cuando un proxy SSL es configurado.&#xa0;Este problema afecta al Juniper Networks Junos OS en las Serie NFX y Serie SRX: versiones 18.3 anteriores a 18.3R3-S4;&#xa0;versiones 18.4 anteriores a 18.4R3-S1;&#xa0;S4;&#xa0;versiones 19.1 anteriores a 19.1R1-S6, 19.1R2-S2, 19.1R3;&#xa0;S4;&#xa0;versiones 19.2 anteriores a 19.2R1-S2, 19.2R2;&#xa0;S4;&#xa0;versiones 19.3 anteriores a 19.3R2.&#xa0;Este problema no afecta a versiones del Juniper Networks Junos OS en Serie NFX y Serie SRX versiones anteriores a 18.3R1"}], "id": "CVE-2021-0206", "lastModified": "2026-06-17T03:29:28.997", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "sirt@juniper.net", "type": "Secondary"}]}, "published": "2021-01-15T18:15:14.777", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11096"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11096"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "sirt@juniper.net", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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