CVE-2021-0240

{"containers": {"cna": {"affected": [{"product": "Junos OS", "vendor": "Juniper Networks", "versions": [{"lessThan": "17.3R3-S12", "status": "affected", "version": "17.3", "versionType": "custom"}, {"lessThan": "17.4R3-S5", "status": "affected", "version": "17.4", "versionType": "custom"}, {"lessThan": "18.1R3-S13", "status": "affected", "version": "18.1", "versionType": "custom"}, {"lessThan": "18.2R3-S8", "status": "affected", "version": "18.2", "versionType": "custom"}, {"lessThan": "18.3R3-S5", "status": "affected", "version": "18.3", "versionType": "custom"}, {"lessThan": "18.4R1-S8, 18.4R3-S7", "status": "affected", "version": "18.4", "versionType": "custom"}, {"lessThan": "19.1R3-S5", "status": "affected", "version": "19.1", "versionType": "custom"}, {"lessThan": "19.2R3-S2", "status": "affected", "version": "19.2", "versionType": "custom"}, {"lessThan": "19.3R3-S2", "status": "affected", "version": "19.3", "versionType": "custom"}, {"lessThan": "19.4R3-S2", "status": "affected", "version": "19.4", "versionType": "custom"}, {"lessThan": "20.1R3", "status": "affected", "version": "20.1", "versionType": "custom"}, {"lessThan": "20.2R2-S3, 20.2R3", "status": "affected", "version": "20.2", "versionType": "custom"}, {"lessThan": "20.3R2", "status": "affected", "version": "20.3", "versionType": "custom"}, {"lessThan": "20.4R2", "status": "affected", "version": "20.4", "versionType": "custom"}]}], "configurations": [{"lang": "en", "value": "The example of DHCPv6 local server configuration stanza affected by this issue is:\n [system services dhcp-local-server dhcpv6]\n\nThe example of configuration stanza for DHCPv6 Relay Agent affected by this issue is: \n [forwarding-options dhcp-relay dhcpv6]"}], "datePublic": "2021-04-14T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "On Juniper Networks Junos OS platforms configured as DHCPv6 local server or DHCPv6 Relay Agent, the Juniper Networks Dynamic Host Configuration Protocol Daemon (JDHCPD) process might crash if a malformed DHCPv6 packet is received, resulting in a restart of the daemon. The daemon automatically restarts without intervention, but continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects DHCPv6. DHCPv4 is not affected by this issue. This issue affects Juniper Networks Junos OS: 17.3 versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R3-S5; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R1-S8, 18.4R3-S7; 19.1 versions prior to 19.1R3-S5; 19.2 versions prior to 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R3-S2; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R2-S3, 20.2R3; 20.3 versions prior to 20.3R2; 20.4 versions prior to 20.4R2."}], "exploits": [{"lang": "en", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-703", "description": "CWE-703 Improper Check or Handling of Exceptional Conditions", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"description": "Denial of Service (DoS)", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-04-22T19:37:05.000Z", "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://kb.juniper.net/JSA11168"}], "solutions": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.2R3-S8, 18.3R3-S5, 18.4R1-S8, 18.4R3-S7, 19.1R3-S5, 19.2R3-S2, 19.3R3-S2, 19.4R3-S2, 20.1R3, 20.2R2-S3, 20.2R3, 20.3R2, 20.4R2, 21.1R1, and all subsequent releases."}], "source": {"advisory": "JSA11168", "defect": ["1564434"], "discovery": "USER"}, "title": "Junos OS: Receipt of malformed DHCPv6 packets causes jdhcpd to crash and restart.", "workarounds": [{"lang": "en", "value": "There are no viable workarounds for this issue."}], "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-2021-0240", "STATE": "PUBLIC", "TITLE": "Junos OS: Receipt of malformed DHCPv6 packets causes jdhcpd to crash and restart."}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Junos OS", "version": {"version_data": [{"version_affected": "<", "version_name": "17.3", "version_value": "17.3R3-S12"}, {"version_affected": "<", "version_name": "17.4", "version_value": "17.4R3-S5"}, {"version_affected": "<", "version_name": "18.1", "version_value": "18.1R3-S13"}, {"version_affected": "<", "version_name": "18.2", "version_value": "18.2R3-S8"}, {"version_affected": "<", "version_name": "18.3", "version_value": "18.3R3-S5"}, {"version_affected": "<", "version_name": "18.4", "version_value": "18.4R1-S8, 18.4R3-S7"}, {"version_affected": "<", "version_name": "19.1", "version_value": "19.1R3-S5"}, {"version_affected": "<", "version_name": "19.2", "version_value": "19.2R3-S2"}, {"version_affected": "<", "version_name": "19.3", "version_value": "19.3R3-S2"}, {"version_affected": "<", "version_name": "19.4", "version_value": "19.4R3-S2"}, {"version_affected": "<", "version_name": "20.1", "version_value": "20.1R3"}, {"version_affected": "<", "version_name": "20.2", "version_value": "20.2R2-S3, 20.2R3"}, {"version_affected": "<", "version_name": "20.3", "version_value": "20.3R2"}, {"version_affected": "<", "version_name": "20.4", "version_value": "20.4R2"}]}}]}, "vendor_name": "Juniper Networks"}]}}, "configuration": [{"lang": "en", "value": "The example of DHCPv6 local server configuration stanza affected by this issue is:\n [system services dhcp-local-server dhcpv6]\n\nThe example of configuration stanza for DHCPv6 Relay Agent affected by this issue is: \n [forwarding-options dhcp-relay dhcpv6]"}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "On Juniper Networks Junos OS platforms configured as DHCPv6 local server or DHCPv6 Relay Agent, the Juniper Networks Dynamic Host Configuration Protocol Daemon (JDHCPD) process might crash if a malformed DHCPv6 packet is received, resulting in a restart of the daemon. The daemon automatically restarts without intervention, but continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects DHCPv6. DHCPv4 is not affected by this issue. This issue affects Juniper Networks Junos OS: 17.3 versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R3-S5; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R1-S8, 18.4R3-S7; 19.1 versions prior to 19.1R3-S5; 19.2 versions prior to 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R3-S2; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R2-S3, 20.2R3; 20.3 versions prior to 20.3R2; 20.4 versions prior to 20.4R2."}]}, "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": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-703 Improper Check or Handling of Exceptional Conditions"}]}, {"description": [{"lang": "eng", "value": "Denial of Service (DoS)"}]}]}, "references": {"reference_data": [{"name": "https://kb.juniper.net/JSA11168", "refsource": "MISC", "url": "https://kb.juniper.net/JSA11168"}]}, "solution": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.2R3-S8, 18.3R3-S5, 18.4R1-S8, 18.4R3-S7, 19.1R3-S5, 19.2R3-S2, 19.3R3-S2, 19.4R3-S2, 20.1R3, 20.2R2-S3, 20.2R3, 20.3R2, 20.4R2, 21.1R1, and all subsequent releases."}], "source": {"advisory": "JSA11168", "defect": ["1564434"], "discovery": "USER"}, "work_around": [{"lang": "en", "value": "There are no viable workarounds for this issue."}]}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T15:32:10.102Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://kb.juniper.net/JSA11168"}]}]}, "cveMetadata": {"assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "assignerShortName": "juniper", "cveId": "CVE-2021-0240", "datePublished": "2021-04-22T19:37:06.056Z", "dateReserved": "2020-10-27T00:00:00.000Z", "dateUpdated": "2024-09-16T20:26:48.246Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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"value": "On Juniper Networks Junos OS platforms configured as DHCPv6 local server or DHCPv6 Relay Agent, the Juniper Networks Dynamic Host Configuration Protocol Daemon (JDHCPD) process might crash if a malformed DHCPv6 packet is received, resulting in a restart of the daemon. The daemon automatically restarts without intervention, but continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects DHCPv6. DHCPv4 is not affected by this issue. This issue affects Juniper Networks Junos OS: 17.3 versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R3-S5; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R1-S8, 18.4R3-S7; 19.1 versions prior to 19.1R3-S5; 19.2 versions prior to 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R3-S2; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R2-S3, 20.2R3; 20.3 versions prior to 20.3R2; 20.4 versions prior to 20.4R2."}, {"lang": "es", "value": "En las plataformas Juniper Networks Junos OS configuradas como servidor local DHCPv6 o DHCPv6 Relay Agent, el proceso Juniper Networks Dynamic Host Configuration Protocol Daemon (JDHCPD) puede presentar un bloqueo si un paquete DHCPv6 malformado se recibe, resultando en un reinicio del demonio.&#xa0;El demonio se reinicia autom\u00e1ticamente sin intervenci\u00f3n, pero 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 solo afecta a DHCPv6.&#xa0;DHCPv4 no est\u00e1 afectado por este problema.&#xa0;Este problema afecta a Juniper Networks Junos OS: versiones 17.3 anteriores a 17.3R3-S12;&#xa0;versiones 17.4 anteriores a 17.4R3-S5;&#xa0;versiones 18.1 anteriores a 18.1R3-S13;&#xa0;18.2 versiones anteriores a 18.2R3-S8;&#xa0;versiones 18.3 anteriores a 18.3R3-S5;&#xa0;18.4 versiones anteriores a 18.4R1-S8, 18.4R3-S7;&#xa0;19.1 versiones anteriores a 19.1R3-S5;&#xa0;19.2 versiones anteriores a 19.2R3-S2;&#xa0;19.&#xa0;3 versiones anteriores a 19.3R3-S2;&#xa0;versiones 19.4 anteriores a 19.4R3-S2;&#xa0;20.1 versiones anteriores a 20.1R3;&#xa0;versiones 20.2 anteriores a 20.2R2-S3, 20.2R3;&#xa0;20.3 versiones anteriores a 20.3R2;&#xa0;versiones 20.4 anteriores a 20.4R2"}], "id": "CVE-2021-0240", "lastModified": "2026-06-17T03:29:34.637", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "ADJACENT_NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 2.9, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:A/AC:M/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 5.5, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.0, "source": "sirt@juniper.net", "type": "Secondary"}, {"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": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-04-22T20:15:08.977", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11168"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11168"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-703"}], "source": "sirt@juniper.net", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-755"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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