CVE-2021-31359

{"containers": {"cna": {"affected": [{"product": "Junos OS", "vendor": "Juniper Networks", "versions": [{"lessThan": "15.1R7-S10", "status": "affected", "version": "15.1", "versionType": "custom"}, {"lessThan": "17.4R3-S5", "status": "affected", "version": "17.4", "versionType": "custom"}, {"lessThan": "18.3R3-S5", "status": "affected", "version": "18.3", "versionType": "custom"}, {"lessThan": "18.4R3-S9", "status": "affected", "version": "18.4", "versionType": "custom"}, {"lessThan": "19.1R3-S6", "status": "affected", "version": "19.1", "versionType": "custom"}, {"lessThan": "19.2R1-S7, 19.2R3-S3", "status": "affected", "version": "19.2", "versionType": "custom"}, {"lessThan": "19.3R2-S6, 19.3R3-S3", "status": "affected", "version": "19.3", "versionType": "custom"}, {"lessThan": "19.4R3-S6", "status": "affected", "version": "19.4", "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": "20.4R2-S1, 20.4R3", "status": "affected", "version": "20.4", "versionType": "custom"}, {"lessThan": "21.1R1-S1, 21.1R2", "status": "affected", "version": "21.1", "versionType": "custom"}]}, {"product": "Junos OS Evolved", "vendor": "Juniper Networks", "versions": [{"lessThan": "20.4R2-S3-EVO", "status": "affected", "version": "unspecified", "versionType": "custom"}, {"lessThan": "21.1*", "status": "affected", "version": "21.1R1-EVO", "versionType": "custom"}]}], "configurations": [{"lang": "en", "value": "There are several configuration options that enable DHCP service. For example:\n\n [edit interfaces ... family inet dhcp]\n\n [edit system processes dhcp-service]\n\n [edit forwarding-options dhcp-relay]"}], "credits": [{"lang": "en", "value": "Juniper SIRT would like to acknowledge and thank awxylitol for responsibly reporting this vulnerability."}], "datePublic": "2021-10-13T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "A local privilege escalation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privileged user to cause the Juniper DHCP daemon (jdhcpd) process to crash, resulting in a Denial of Service (DoS), or execute arbitrary commands as root. Continued processing of malicious input will repeatedly crash the system and sustain the Denial of Service (DoS) condition. Systems are only vulnerable if jdhcpd is running, which can be confirmed via the 'show system processes' command. For example: root@host# run show system processes extensive | match dhcp 26537 root -16 0 97568K 13692K RUN 0 0:01 3.71% jdhcpd This issue affects: Juniper Networks Junos OS: All versions, including the following supported releases: 15.1 versions prior to 15.1R7-S10; 17.4 versions prior to 17.4R3-S5; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R3-S6; 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 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2. Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO; All versions of 21.1-EVO."}], "exploits": [{"lang": "en", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-269", "description": "CWE-269 Improper Privilege Management", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-121", "description": "CWE-121 Stack-based Buffer Overflow", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"description": "Denial of Service (DoS)", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-11-02T14:08:38.000Z", "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://kb.juniper.net/JSA11222"}], "solutions": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: \n\nJunos OS 15.1R7-S10, 17.4R3-S5, 18.3R3-S5, 18.4R3-S9, 19.1R3-S6, 19.2R1-S7, 19.2R3-S3, 19.3R2-S6, 19.3R3-S3, 19.4R3-S6, 20.1R2-S2, 20.1R3-S1, 20.2R3-S2, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.1R3, 21.2R1, and all subsequent releases.\n\nJunos OS Evolved 20.4R2-S3-EVO, 21.2R1-EVO, and all subsequent releases."}], "source": {"advisory": "JSA11222", "defect": ["1568654"], "discovery": "EXTERNAL"}, "title": "Junos OS and Junos OS Evolved: Local Privilege Escalation vulnerability", "workarounds": [{"lang": "en", "value": "Use access lists or firewall filters to limit access to the device via CLI only from trusted hosts and from trusted administrators."}], "x_generator": {"engine": "Vulnogram 0.0.9"}, "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "sirt@juniper.net", "DATE_PUBLIC": "2021-10-13T16:00:00.000Z", "ID": "CVE-2021-31359", "STATE": "PUBLIC", "TITLE": "Junos OS and Junos OS Evolved: Local Privilege Escalation vulnerability"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Junos OS", "version": {"version_data": [{"version_affected": "<", "version_name": "15.1", "version_value": "15.1R7-S10"}, {"version_affected": "<", "version_name": "17.4", "version_value": "17.4R3-S5"}, {"version_affected": "<", "version_name": "18.3", "version_value": "18.3R3-S5"}, {"version_affected": "<", "version_name": "18.4", "version_value": "18.4R3-S9"}, {"version_affected": "<", "version_name": "19.1", "version_value": "19.1R3-S6"}, {"version_affected": "<", "version_name": "19.2", "version_value": "19.2R1-S7, 19.2R3-S3"}, {"version_affected": "<", "version_name": "19.3", "version_value": "19.3R2-S6, 19.3R3-S3"}, {"version_affected": "<", "version_name": "19.4", "version_value": "19.4R3-S6"}, {"version_affected": "<", "version_name": "20.1", "version_value": "20.1R2-S2, 20.1R3-S1"}, {"version_affected": "<", "version_name": "20.2", "version_value": "20.2R3-S2"}, {"version_affected": "<", "version_name": "20.3", "version_value": "20.3R3"}, {"version_affected": "<", "version_name": "20.4", "version_value": "20.4R2-S1, 20.4R3"}, {"version_affected": "<", "version_name": "21.1", "version_value": "21.1R1-S1, 21.1R2"}]}}, {"product_name": "Junos OS Evolved", "version": {"version_data": [{"version_affected": "<", "version_value": "20.4R2-S3-EVO"}, {"version_affected": ">=", "version_name": "21.1", "version_value": "21.1R1-EVO"}]}}]}, "vendor_name": "Juniper Networks"}]}}, "configuration": [{"lang": "en", "value": "There are several configuration options that enable DHCP service. For example:\n\n [edit interfaces ... family inet dhcp]\n\n [edit system processes dhcp-service]\n\n [edit forwarding-options dhcp-relay]"}], "credit": [{"lang": "eng", "value": "Juniper SIRT would like to acknowledge and thank awxylitol for responsibly reporting this vulnerability."}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "A local privilege escalation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privileged user to cause the Juniper DHCP daemon (jdhcpd) process to crash, resulting in a Denial of Service (DoS), or execute arbitrary commands as root. Continued processing of malicious input will repeatedly crash the system and sustain the Denial of Service (DoS) condition. Systems are only vulnerable if jdhcpd is running, which can be confirmed via the 'show system processes' command. For example: root@host# run show system processes extensive | match dhcp 26537 root -16 0 97568K 13692K RUN 0 0:01 3.71% jdhcpd This issue affects: Juniper Networks Junos OS: All versions, including the following supported releases: 15.1 versions prior to 15.1R7-S10; 17.4 versions prior to 17.4R3-S5; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R3-S6; 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 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2. Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO; All versions of 21.1-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": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-269 Improper Privilege Management"}]}, {"description": [{"lang": "eng", "value": "CWE-121 Stack-based Buffer Overflow"}]}, {"description": [{"lang": "eng", "value": "Denial of Service (DoS)"}]}]}, "references": {"reference_data": [{"name": "https://kb.juniper.net/JSA11222", "refsource": "CONFIRM", "url": "https://kb.juniper.net/JSA11222"}]}, "solution": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: \n\nJunos OS 15.1R7-S10, 17.4R3-S5, 18.3R3-S5, 18.4R3-S9, 19.1R3-S6, 19.2R1-S7, 19.2R3-S3, 19.3R2-S6, 19.3R3-S3, 19.4R3-S6, 20.1R2-S2, 20.1R3-S1, 20.2R3-S2, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.1R3, 21.2R1, and all subsequent releases.\n\nJunos OS Evolved 20.4R2-S3-EVO, 21.2R1-EVO, and all subsequent releases."}], "source": {"advisory": "JSA11222", "defect": ["1568654"], "discovery": "EXTERNAL"}, "work_around": [{"lang": "en", "value": "Use access lists or firewall filters to limit access to the device via CLI only from trusted hosts and from trusted administrators."}]}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T22:55:53.717Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://kb.juniper.net/JSA11222"}]}]}, "cveMetadata": {"assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "assignerShortName": "juniper", "cveId": "CVE-2021-31359", "datePublished": "2021-10-19T18:16:44.273Z", "dateReserved": "2021-04-15T00:00:00.000Z", "dateUpdated": "2024-09-16T23:55:49.414Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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"cpe:2.3:o:juniper:junos_os_evolved:21.1:r1:*:*:*:*:*:*", "matchCriteriaId": "AE674DD3-3590-4434-B144-5AD7EB5F039D", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos_os_evolved:21.1:r1-s1:*:*:*:*:*:*", "matchCriteriaId": "0099BDA9-9D4B-4D6C-8234-EFD9E8C63476", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos_os_evolved:21.1:r2:*:*:*:*:*:*", "matchCriteriaId": "D8729BC1-FB09-4E6D-A5D5-8BDC589555B6", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A local privilege escalation vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privileged user to cause the Juniper DHCP daemon (jdhcpd) process to crash, resulting in a Denial of Service (DoS), or execute arbitrary commands as root. Continued processing of malicious input will repeatedly crash the system and sustain the Denial of Service (DoS) condition. Systems are only vulnerable if jdhcpd is running, which can be confirmed via the 'show system processes' command. For example: root@host# run show system processes extensive | match dhcp 26537 root -16 0 97568K 13692K RUN 0 0:01 3.71% jdhcpd This issue affects: Juniper Networks Junos OS: All versions, including the following supported releases: 15.1 versions prior to 15.1R7-S10; 17.4 versions prior to 17.4R3-S5; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R3-S6; 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 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2. Juniper Networks Junos OS Evolved: All versions prior to 20.4R2-S3-EVO; All versions of 21.1-EVO."}, {"lang": "es", "value": "Una vulnerabilidad de escalada de privilegios local en Juniper Networks Junos OS y Junos OS Evolved permite que un usuario local con pocos privilegios provoque el bloqueo del proceso del demonio DHCP de Juniper (jdhcpd), lo que provoca una denegaci\u00f3n de servicio (DoS), o ejecute comandos arbitrarios como root. Si se contin\u00faa procesando la entrada maliciosa, el sistema se bloquear\u00e1 repetidamente y se mantendr\u00e1 la condici\u00f3n de denegaci\u00f3n de servicio (DoS). Los sistemas s\u00f3lo son vulnerables si jdhcpd se est\u00e1 ejecutando, lo que puede confirmarse mediante el comando 'show system processes'. Por ejemplo: root@host# run show system processes extensive | match dhcp 26537 root -16 0 97568K 13692K RUN 0 0:01 3.71% jdhcpd Este problema afecta a: Juniper Networks Junos OS: Todas las versiones, incluidas las siguientes versiones compatibles: 15.1 versiones anteriores a 15.1R7-S10; 17.4 versiones anteriores a 17.4R3-S5; 18.3 versiones anteriores a 18.3R3-S5; 18.4 versiones anteriores a 18.4R3-S9; 19.1 versiones anteriores a 19.1R3-S6; 19.2 versiones anteriores a 19.2R1-S7, 19.2R3-S3; 19.3 versiones anteriores a 19. 3R2-S6, 19.3R3-S3; 19.4 versiones anteriores a 19.4R3-S6; 20.1 versiones anteriores a 20.1R2-S2, 20.1R3-S1; 20.2 versiones anteriores a 20.2R3-S2; 20.3 versiones anteriores a 20.3R3; 20.4 versiones anteriores a 20.4R2-S1, 20.4R3; 21.1 versiones anteriores a 21.1R1-S1, 21.1R2. Juniper Networks Junos OS Evolved: Todas las versiones anteriores a 20.4R2-S3-EVO; Todas las versiones de 21.1-EVO"}], "id": "CVE-2021-31359", "lastModified": "2026-06-17T03:51:37.213", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 7.2, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 10.0, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "sirt@juniper.net", "type": "Secondary"}]}, "published": "2021-10-19T19:15:09.070", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11222"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11222"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-121"}, {"lang": "en", "value": "CWE-269"}], "source": "sirt@juniper.net", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-269"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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