CVE-2021-0293

{"containers": {"cna": {"affected": [{"product": "Junos OS", "vendor": "Juniper Networks", "versions": [{"lessThan": "18.2R1", "status": "unaffected", "version": "unspecified", "versionType": "custom"}, {"lessThan": "18.3R3-S4", "status": "affected", "version": "18.3", "versionType": "custom"}, {"lessThan": "18.4R1-S8, 18.4R2-S6, 18.4R3-S7", "status": "affected", "version": "18.4", "versionType": "custom"}, {"lessThan": "19.1R1-S6, 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": "19.3R2-S6, 19.3R3-S1", "status": "affected", "version": "19.3", "versionType": "custom"}, {"lessThan": "19.4R1-S4, 19.4R2-S3, 19.4R3-S1", "status": "affected", "version": "19.4", "versionType": "custom"}, {"lessThan": "20.1R2", "status": "affected", "version": "20.1", "versionType": "custom"}, {"lessThan": "20.2R2-S1, 20.2R3", "status": "affected", "version": "20.2", "versionType": "custom"}, {"lessThan": "20.3R1-S1, 20.3R2", "status": "affected", "version": "20.3", "versionType": "custom"}, {"lessThan": "18.2R2-S8, 18.2R3-S7", "status": "affected", "version": "18.2", "versionType": "custom"}]}], "datePublic": "2021-07-14T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "A vulnerability in Juniper Networks Junos OS caused by Missing Release of Memory after Effective Lifetime leads to a memory leak each time the CLI command 'show system connections extensive' is executed. The amount of memory leaked on each execution depends on the number of TCP connections from and to the system. Repeated execution will cause more memory to leak and eventually daemons that need to allocate additionally memory and ultimately the kernel to crash, which will result in traffic loss. Continued execution of this command will cause a sustained Denial of Service (DoS) condition. An administrator can use the following CLI command to monitor for increase in memory consumption of the netstat process, if it exists: user@junos> show system processes extensive | match \"username|netstat\" PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND 21181 root 100 0 5458M 4913M CPU3 2 0:59 97.27% netstat The following log message might be observed if this issue happens: kernel: %KERN-3: pid 21181 (netstat), uid 0, was killed: out of swap space This issue affects Juniper Networks Junos OS 18.2 versions prior to 18.2R2-S8, 18.2R3-S7. 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S7; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R2-S6, 19.3R3-S1; 19.4 versions prior to 19.4R1-S4, 19.4R2-S3, 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2-S1, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2; This issue does not affect Juniper Networks Junos OS versions prior to 18.2R1."}], "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": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-401", "description": "CWE-401 Missing Release of Memory after Effective Lifetime", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-07-15T20:01:11.000Z", "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://kb.juniper.net/JSA11195"}], "solutions": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: 18.2R2-S8, 18.2R3-S7, 18.3R3-S4, 18.4R1-S8, 18.4R2-S6, 18.4R3-S7, 19.1R1-S6, 19.1R2-S2, 19.1R3-S4, 19.2R1-S6, 19.2R3-S2, 19.3R2-S6, 19.3R3-S1, 19.3R3-S2, 19.4R1-S4, 19.4R2-S3, 19.4R3-S1, 20.1R2, 20.2R2-S1, 20.2R3, 20.3R1-S1, 20.3R2, 20.4R1, and all subsequent releases."}], "source": {"advisory": "JSA11195", "defect": ["1548355"], "discovery": "USER"}, "title": "Junos OS: Out-of-memory condition and crashes can occur after executing a certain CLI command repeatedly", "workarounds": [{"lang": "en", "value": "Please use 'show system connections' (without extensive) and restrict access to 'show system connections extensive'.\n\nTo recover please use:\n\n request system process terminate <PID>\n\nwith the PID for the netstat process from the output of 'show system processes extensive'."}], "x_generator": {"engine": "Vulnogram 0.0.9"}, "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "sirt@juniper.net", "DATE_PUBLIC": "2021-07-14T16:00:00.000Z", "ID": "CVE-2021-0293", "STATE": "PUBLIC", "TITLE": "Junos OS: Out-of-memory condition and crashes can occur after executing a certain CLI command repeatedly"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Junos OS", "version": {"version_data": [{"version_affected": "<", "version_name": "18.3", "version_value": "18.3R3-S4"}, {"version_affected": "<", "version_name": "18.4", "version_value": "18.4R1-S8, 18.4R2-S6, 18.4R3-S7"}, {"version_affected": "<", "version_name": "19.1", "version_value": "19.1R1-S6, 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": "19.3R2-S6, 19.3R3-S1"}, {"version_affected": "<", "version_name": "19.4", "version_value": "19.4R1-S4, 19.4R2-S3, 19.4R3-S1"}, {"version_affected": "<", "version_name": "20.1", "version_value": "20.1R2"}, {"version_affected": "<", "version_name": "20.2", "version_value": "20.2R2-S1, 20.2R3"}, {"version_affected": "<", "version_name": "20.3", "version_value": "20.3R1-S1, 20.3R2"}, {"version_affected": "!<", "version_value": "18.2R1"}, {"version_affected": "<", "version_name": "18.2", "version_value": "18.2R2-S8, 18.2R3-S7"}]}}]}, "vendor_name": "Juniper Networks"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "A vulnerability in Juniper Networks Junos OS caused by Missing Release of Memory after Effective Lifetime leads to a memory leak each time the CLI command 'show system connections extensive' is executed. The amount of memory leaked on each execution depends on the number of TCP connections from and to the system. Repeated execution will cause more memory to leak and eventually daemons that need to allocate additionally memory and ultimately the kernel to crash, which will result in traffic loss. Continued execution of this command will cause a sustained Denial of Service (DoS) condition. An administrator can use the following CLI command to monitor for increase in memory consumption of the netstat process, if it exists: user@junos> show system processes extensive | match \"username|netstat\" PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND 21181 root 100 0 5458M 4913M CPU3 2 0:59 97.27% netstat The following log message might be observed if this issue happens: kernel: %KERN-3: pid 21181 (netstat), uid 0, was killed: out of swap space This issue affects Juniper Networks Junos OS 18.2 versions prior to 18.2R2-S8, 18.2R3-S7. 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S7; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R2-S6, 19.3R3-S1; 19.4 versions prior to 19.4R1-S4, 19.4R2-S3, 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2-S1, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2; This issue does not affect Juniper Networks Junos OS versions prior to 18.2R1."}]}, "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": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/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-401 Missing Release of Memory after Effective Lifetime"}]}]}, "references": {"reference_data": [{"name": "https://kb.juniper.net/JSA11195", "refsource": "CONFIRM", "url": "https://kb.juniper.net/JSA11195"}]}, "solution": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: 18.2R2-S8, 18.2R3-S7, 18.3R3-S4, 18.4R1-S8, 18.4R2-S6, 18.4R3-S7, 19.1R1-S6, 19.1R2-S2, 19.1R3-S4, 19.2R1-S6, 19.2R3-S2, 19.3R2-S6, 19.3R3-S1, 19.3R3-S2, 19.4R1-S4, 19.4R2-S3, 19.4R3-S1, 20.1R2, 20.2R2-S1, 20.2R3, 20.3R1-S1, 20.3R2, 20.4R1, and all subsequent releases."}], "source": {"advisory": "JSA11195", "defect": ["1548355"], "discovery": "USER"}, "work_around": [{"lang": "en", "value": "Please use 'show system connections' (without extensive) and restrict access to 'show system connections extensive'.\n\nTo recover please use:\n\n request system process terminate <PID>\n\nwith the PID for the netstat process from the output of 'show system processes extensive'."}]}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T15:32:10.595Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://kb.juniper.net/JSA11195"}]}]}, "cveMetadata": {"assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "assignerShortName": "juniper", "cveId": "CVE-2021-0293", "datePublished": "2021-07-15T20:01:11.963Z", "dateReserved": "2020-10-27T00:00:00.000Z", "dateUpdated": "2024-09-16T22:40:45.783Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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The amount of memory leaked on each execution depends on the number of TCP connections from and to the system. Repeated execution will cause more memory to leak and eventually daemons that need to allocate additionally memory and ultimately the kernel to crash, which will result in traffic loss. Continued execution of this command will cause a sustained Denial of Service (DoS) condition. An administrator can use the following CLI command to monitor for increase in memory consumption of the netstat process, if it exists: user@junos> show system processes extensive | match \"username|netstat\" PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND 21181 root 100 0 5458M 4913M CPU3 2 0:59 97.27% netstat The following log message might be observed if this issue happens: kernel: %KERN-3: pid 21181 (netstat), uid 0, was killed: out of swap space This issue affects Juniper Networks Junos OS 18.2 versions prior to 18.2R2-S8, 18.2R3-S7. 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S7; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R2-S6, 19.3R3-S1; 19.4 versions prior to 19.4R1-S4, 19.4R2-S3, 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2-S1, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2; This issue does not affect Juniper Networks Junos OS versions prior to 18.2R1."}, {"lang": "es", "value": "Una vulnerabilidad en Juniper Networks Junos OS causada por una Falta de Liberaci\u00f3n de Memoria despu\u00e9s del Tiempo de vida Efectivo conlleva a una p\u00e9rdida de memoria cada vez que se ejecuta el comando CLI \"show system connections extensive\". La cantidad de memoria perdida en cada ejecuci\u00f3n depende del n\u00famero de conexiones TCP desde y hacia el sistema. Una ejecuci\u00f3n repetida causar\u00e1 una mayor p\u00e9rdida de memoria y, eventualmente, los demonios que necesitan asignar memoria adicional y, en \u00faltima instancia el bloqueo del kernel, que resultar\u00eda en una p\u00e9rdida de tr\u00e1fico. Una continua ejecuci\u00f3n de este comando causar\u00e1 una condici\u00f3n de Denegaci\u00f3n de Servicio (DoS) sostenida. Un administrador puede usar el siguiente comando CLI para monitorear el incremento en el consumo de memoria del proceso netstat, si se presenta: user@junos show system processes extensive | match \"username|netstat\" PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND 21181 root 100 0 5458M 4913M CPU3 2 0:59 97. 27% netstat Si se produce este problema, puede observarse el siguiente mensaje de registro: kernel: %KERN-3: pid 21181 (netstat), uid 0, was killed: out of swap space. Este problema afecta a las versiones de Juniper Networks Junos OS 18.2 anteriores a 18.2R2-S8, 18.2R3-S7. versiones 18.3 anteriores a 18.3R3-S4; versiones 18.4 anteriores a 18.4R1-S8, 18.4R2-S6, 18.4R3-S7; versiones 19.1 anteriores a 19.1R1-S6, 19.1R2-S2, 19.1R3-S4; versiones 19.2 anteriores a 19.2R1-S6, 19.2R3-S2; versiones 19.3 anteriores a 19.3R2-S6, 19.3R3-S1; versiones 19. 4 anteriores a 19.4R1-S4, 19.4R2-S3, 19.4R3-S1; versiones 20.1 anteriores a 20.1R2; 20.2 versiones anteriores a 20.2R2-S1, 20.2R3; versiones 20.3 anteriores a 20.3R1-S1, 20.3R2; Este problema no afecta a las versiones del Juniper Networks Junos OS anteriores a 18.2R1"}], "id": "CVE-2021-0293", "lastModified": "2026-06-17T03:29:44.287", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 2.1, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "sirt@juniper.net", "type": "Secondary"}]}, "published": "2021-07-15T20:15:11.177", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11195"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11195"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "sirt@juniper.net", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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