CVE-2021-0236

{"containers": {"cna": {"affected": [{"product": "Junos OS", "vendor": "Juniper Networks", "versions": [{"lessThan": "18.4R1", "status": "unaffected", "version": "unspecified", "versionType": "custom"}, {"lessThan": "18.4R1-S8, 18.4R2-S7, 18.4R3-S7", "status": "affected", "version": "18.4", "versionType": "custom"}, {"lessThan": "19.1R2-S2, 19.1R3-S4", "status": "affected", "version": "19.1", "versionType": "custom"}, {"lessThan": "19.2R1-S6, 19.2R3-S2", "status": "affected", "version": "19.2", "versionType": "custom"}, {"lessThan": "19.3R3-S2", "status": "affected", "version": "19.3", "versionType": "custom"}, {"lessThan": "19.4R2-S4, 19.4R3-S1", "status": "affected", "version": "19.4", "versionType": "custom"}, {"lessThan": "20.1R2, 20.1R3, 20.1R3-EVO", "status": "affected", "version": "20.1", "versionType": "custom"}, {"lessThan": "20.2R2, 20.2R3, 20.2R3-EVO", "status": "affected", "version": "20.2", "versionType": "custom"}, {"lessThan": "20.3R1-S1, 20.3R2, 20.3R2-EVO", "status": "affected", "version": "20.3", "versionType": "custom"}]}, {"product": "Junos OS Evolved", "vendor": "Juniper Networks", "versions": [{"lessThan": "18.4R1-EVO", "status": "unaffected", "version": "unspecified", "versionType": "custom"}, {"lessThan": "20.3R2-EVO", "status": "affected", "version": "20.3-EVO", "versionType": "custom"}]}], "configurations": [{"lang": "en", "value": "The examples of the config stanza affected by this issue:\n [ protocols bgp group <group-name> family inet6-vpn flow ]"}], "datePublic": "2021-04-14T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "Due to an improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Evolved the Routing Protocol Daemon (RPD) service, upon receipt of a specific matching BGP packet meeting a specific term in the flowspec configuration, crashes and restarts causing a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects only Multiprotocol BGP (MP-BGP) VPNv6 FlowSpec deployments. This issue affects: Juniper Networks Junos OS: 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; 19.1 versions prior to 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R2-S4, 19.4R3-S1; 20.1 versions prior to 20.1R2, 20.1R3; 20.2 versions prior to 20.2R2, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2. Juniper Networks Junos OS Evolved: All versions after 18.4R1-EVO prior to 20.3R2-EVO. This issue does not affect: Juniper Networks Junos OS versions prior to 18.4R1. Juniper Networks Junos OS Evolved versions prior to 18.4R1-EVO."}], "exploits": [{"lang": "en", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-754", "description": "CWE-754 Improper Check for Unusual or Exceptional Conditions", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"description": "Denial of Service (DoS)", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-04-22T19:37:03.000Z", "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://kb.juniper.net/JSA11131"}], "solutions": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue:\n\nJunos OS: 18.4R1-S8, 18.4R2-S7, 18.4R3-S7, 19.1R2-S2, 19.1R3-S4, 19.2R1-S6, 19.2R3-S2, 19.3R3-S2, 19.4R2-S4, 19.4R3-S1, 20.1R2, 20.1R3, 20.2R2, 20.2R3, 20.3R1-S1, 20.3R2, 20.4R1 and all subsequent releases.\n\nJunos OS Evolved: 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases."}], "source": {"advisory": "JSA11131", "defect": ["1537085"], "discovery": "INTERNAL"}, "title": "Junos OS: A specific BGP VPNv6 flowspec message causes routing protocol daemon (rpd) process to crash with a core.", "workarounds": [{"lang": "en", "value": "Do not configure \"family inet6-vpn flow\" under BGP if no inet6-vpn routes are required to be received."}], "x_generator": {"engine": "Vulnogram 0.0.9"}, "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "sirt@juniper.net", "DATE_PUBLIC": "2021-04-14T16:00:00.000Z", "ID": "CVE-2021-0236", "STATE": "PUBLIC", "TITLE": "Junos OS: A specific BGP VPNv6 flowspec message causes routing protocol daemon (rpd) process to crash with a core."}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Junos OS", "version": {"version_data": [{"version_affected": "!<", "version_value": "18.4R1"}, {"version_affected": "<", "version_name": "18.4", "version_value": "18.4R1-S8, 18.4R2-S7, 18.4R3-S7"}, {"version_affected": "<", "version_name": "19.1", "version_value": "19.1R2-S2, 19.1R3-S4"}, {"version_affected": "<", "version_name": "19.2", "version_value": "19.2R1-S6, 19.2R3-S2"}, {"version_affected": "<", "version_name": "19.3", "version_value": "19.3R3-S2"}, {"version_affected": "<", "version_name": "19.4", "version_value": "19.4R2-S4, 19.4R3-S1"}, {"version_affected": "<", "version_name": "20.1", "version_value": "20.1R2, 20.1R3, 20.1R3-EVO"}, {"version_affected": "<", "version_name": "20.2", "version_value": "20.2R2, 20.2R3, 20.2R3-EVO"}, {"version_affected": "<", "version_name": "20.3", "version_value": "20.3R1-S1, 20.3R2, 20.3R2-EVO"}]}}, {"product_name": "Junos OS Evolved", "version": {"version_data": [{"version_affected": "!<", "version_value": "18.4R1-EVO"}, {"version_affected": "<", "version_name": "20.3-EVO", "version_value": "20.3R2-EVO"}]}}]}, "vendor_name": "Juniper Networks"}]}}, "configuration": [{"lang": "en", "value": "The examples of the config stanza affected by this issue:\n [ protocols bgp group <group-name> family inet6-vpn flow ]"}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Due to an improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Evolved the Routing Protocol Daemon (RPD) service, upon receipt of a specific matching BGP packet meeting a specific term in the flowspec configuration, crashes and restarts causing a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects only Multiprotocol BGP (MP-BGP) VPNv6 FlowSpec deployments. This issue affects: Juniper Networks Junos OS: 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; 19.1 versions prior to 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R2-S4, 19.4R3-S1; 20.1 versions prior to 20.1R2, 20.1R3; 20.2 versions prior to 20.2R2, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2. Juniper Networks Junos OS Evolved: All versions after 18.4R1-EVO prior to 20.3R2-EVO. This issue does not affect: Juniper Networks Junos OS versions prior to 18.4R1. Juniper Networks Junos OS Evolved versions prior to 18.4R1-EVO."}]}, "exploit": [{"lang": "en", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}], "generator": {"engine": "Vulnogram 0.0.9"}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-754 Improper Check for Unusual or Exceptional Conditions"}]}, {"description": [{"lang": "eng", "value": "Denial of Service (DoS)"}]}]}, "references": {"reference_data": [{"name": "https://kb.juniper.net/JSA11131", "refsource": "MISC", "url": "https://kb.juniper.net/JSA11131"}]}, "solution": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue:\n\nJunos OS: 18.4R1-S8, 18.4R2-S7, 18.4R3-S7, 19.1R2-S2, 19.1R3-S4, 19.2R1-S6, 19.2R3-S2, 19.3R3-S2, 19.4R2-S4, 19.4R3-S1, 20.1R2, 20.1R3, 20.2R2, 20.2R3, 20.3R1-S1, 20.3R2, 20.4R1 and all subsequent releases.\n\nJunos OS Evolved: 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases."}], "source": {"advisory": "JSA11131", "defect": ["1537085"], "discovery": "INTERNAL"}, "work_around": [{"lang": "en", "value": "Do not configure \"family inet6-vpn flow\" under BGP if no inet6-vpn routes are required to be received."}]}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T15:32:10.109Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://kb.juniper.net/JSA11131"}]}]}, "cveMetadata": {"assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "assignerShortName": "juniper", "cveId": "CVE-2021-0236", "datePublished": "2021-04-22T19:37:03.319Z", "dateReserved": "2020-10-27T00:00:00.000Z", "dateUpdated": "2024-09-16T19:15:47.001Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects only Multiprotocol BGP (MP-BGP) VPNv6 FlowSpec deployments. This issue affects: Juniper Networks Junos OS: 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; 19.1 versions prior to 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R2-S4, 19.4R3-S1; 20.1 versions prior to 20.1R2, 20.1R3; 20.2 versions prior to 20.2R2, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2. Juniper Networks Junos OS Evolved: All versions after 18.4R1-EVO prior to 20.3R2-EVO. This issue does not affect: Juniper Networks Junos OS versions prior to 18.4R1. Juniper Networks Junos OS Evolved versions prior to 18.4R1-EVO."}, {"lang": "es", "value": "Debido a una comprobaci\u00f3n inapropiada de condiciones inusuales o excepcionales en Juniper Networks Junos OS y Junos OS Evolved, el Routing Protocol Daemon (RPD), al recibir un paquete BGP espec\u00edfico que coincide con un t\u00e9rmino espec\u00edfico en la configuraci\u00f3n de flowpec, se bloquea y se reinicia causando una Denegaci\u00f3n de Servicio (DoS).&#xa0;La recepci\u00f3n y el procesamiento continuo de este paquete crear\u00e1n una condici\u00f3n sostenida de Denegaci\u00f3n de Servicio (DoS).&#xa0;Este problema afecta solo a las implementaciones Multiprotocol BGP (MP-BGP) VPNv6 FlowSpec.&#xa0;Este problema afecta a: Juniper Networks Junos OS: versiones 18.4 anteriores a 18.4R1-S8, 18.4R2-S7, 18.4R3-S7;&#xa0;versiones 19.1 anteriores a 19.1R2-S2, 19.1R3-S4;&#xa0;versiones 19.2 anteriores a 19.2R1-S6, 19.2R3-S2;&#xa0;versiones 19.3 anteriores a 19.3R3-S2;&#xa0;versiones 19.4 anteriores a 19.4R2-S4, 19.4R3-S1;&#xa0;versiones 20.1 anteriores a 20.1R2, 20.1R3;&#xa0;versiones 20.2 anteriores a 20.2R2, 20.2R3;&#xa0;versiones 20.&#xa0;3 anteriores a 20.3R1-S1, 20.3R2.&#xa0;Juniper Networks Junos OS Evolved: todas las versiones posteriores a 18.4R1-EVO anteriores a 20.3R2-EVO.&#xa0;Este problema no afecta a: Juniper Networks Junos OS versiones anteriores a 18.4R1.&#xa0;Juniper Networks Junos OS Evolved versiones anteriores a 18.4R1-EVO"}], "id": "CVE-2021-0236", "lastModified": "2026-06-17T03:29:33.977", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "COMPLETE", "baseScore": 6.8, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:C", "version": "2.0"}, "exploitabilityScore": 8.0, "impactScore": 6.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/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"}]}, "published": "2021-04-22T20:15:08.843", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11131"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11131"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-754"}], "source": "sirt@juniper.net", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-754"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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