CVE-2021-31371

{"containers": {"cna": {"affected": [{"platforms": ["QFX5000 Series"], "product": "Junos OS", "vendor": "Juniper Networks", "versions": [{"lessThan": "17.3R3-S12", "status": "affected", "version": "unspecified", "versionType": "custom"}, {"lessThan": "18.1R3-S13", "status": "affected", "version": "18.1", "versionType": "custom"}, {"lessThan": "18.3R3-S5", "status": "affected", "version": "18.3", "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": "19.4R1-S4, 19.4R3-S5", "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-S1", "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"}, {"lessThan": "21.2R1", "status": "affected", "version": "21.2", "versionType": "custom"}]}], "datePublic": "2021-10-13T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "Juniper Networks Junos OS uses the 128.0.0.0/2 subnet for internal communications between the RE and PFEs. It was discovered that packets utilizing these IP addresses may egress an QFX5000 Series switch, leaking configuration information such as heartbeats, kernel versions, etc. out to the Internet, leading to an information exposure vulnerability. This issue affects Juniper Networks Junos OS on QFX5110, QFX5120, QFX5200, QFX5210 Series, and QFX5100 with QFX 5e Series image installed: All versions prior to 17.3R3-S12; 18.1 versions prior to 18.1R3-S13; 18.3 versions prior to 18.3R3-S5; 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 19.4R1-S4, 19.4R3-S5; 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-S1; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2;"}], "exploits": [{"lang": "en", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-200", "description": "CWE-200 Information Exposure", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-11-02T14:08:41.000Z", "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://kb.juniper.net/JSA11236"}], "solutions": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: 17.3R3-S12, 18.1R3-S13, 18.3R3-S5, 19.1R3-S6, 19.2R1-S7, 19.2R3-S3, 19.3R2-S6, 19.3R3-S3, 19.4R1-S4, 19.4R3-S5, 20.1R2-S2, 20.1R3-S1, 20.2R3-S2, 20.3R3-S1, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1, and all subsequent releases."}], "source": {"advisory": "JSA11236", "defect": ["1561722"], "discovery": "USER"}, "title": "Junos OS: QFX5000 Series: Traffic from the network internal to the device (128.0.0.0) may be forwarded to egress interfaces.", "workarounds": [{"lang": "en", "value": "Configure a firewall filter to discard packets sourced from the internal network.\n\nDisabling the net.transit_re sysctl flag will also cause management traffic forwarded to the PFE ports to be dropped:\n % sysctl -w net.transit_re=0\n\nNote that sysctl flags do not survive a reboot."}], "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-2021-31371", "STATE": "PUBLIC", "TITLE": "Junos OS: QFX5000 Series: Traffic from the network internal to the device (128.0.0.0) may be forwarded to egress interfaces."}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Junos OS", "version": {"version_data": [{"platform": "QFX5000 Series", "version_affected": "<", "version_value": "17.3R3-S12"}, {"platform": "QFX5000 Series", "version_affected": "<", "version_name": "18.1", "version_value": "18.1R3-S13"}, {"platform": "QFX5000 Series", "version_affected": "<", "version_name": "18.3", "version_value": "18.3R3-S5"}, {"platform": "QFX5000 Series", "version_affected": "<", "version_name": "19.1", "version_value": "19.1R3-S6"}, {"platform": "QFX5000 Series", "version_affected": "<", "version_name": "19.2", "version_value": "19.2R1-S7, 19.2R3-S3"}, {"platform": "QFX5000 Series", "version_affected": "<", "version_name": "19.3", "version_value": "19.3R2-S6, 19.3R3-S3"}, {"platform": "QFX5000 Series", "version_affected": "<", "version_name": "19.4", "version_value": "19.4R1-S4, 19.4R3-S5"}, {"platform": "QFX5000 Series", "version_affected": "<", "version_name": "20.1", "version_value": "20.1R2-S2, 20.1R3-S1"}, {"platform": "QFX5000 Series", "version_affected": "<", "version_name": "20.2", "version_value": "20.2R3-S2"}, {"platform": "QFX5000 Series", "version_affected": "<", "version_name": "20.3", "version_value": "20.3R3-S1"}, {"platform": "QFX5000 Series", "version_affected": "<", "version_name": "20.4", "version_value": "20.4R2-S1, 20.4R3"}, {"platform": "QFX5000 Series", "version_affected": "<", "version_name": "21.1", "version_value": "21.1R1-S1, 21.1R2"}, {"platform": "QFX5000 Series", "version_affected": "<", "version_name": "21.2", "version_value": "21.2R1"}]}}]}, "vendor_name": "Juniper Networks"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Juniper Networks Junos OS uses the 128.0.0.0/2 subnet for internal communications between the RE and PFEs. It was discovered that packets utilizing these IP addresses may egress an QFX5000 Series switch, leaking configuration information such as heartbeats, kernel versions, etc. out to the Internet, leading to an information exposure vulnerability. This issue affects Juniper Networks Junos OS on QFX5110, QFX5120, QFX5200, QFX5210 Series, and QFX5100 with QFX 5e Series image installed: All versions prior to 17.3R3-S12; 18.1 versions prior to 18.1R3-S13; 18.3 versions prior to 18.3R3-S5; 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 19.4R1-S4, 19.4R3-S5; 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-S1; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2;"}]}, "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": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-200 Information Exposure"}]}]}, "references": {"reference_data": [{"name": "https://kb.juniper.net/JSA11236", "refsource": "CONFIRM", "url": "https://kb.juniper.net/JSA11236"}]}, "solution": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: 17.3R3-S12, 18.1R3-S13, 18.3R3-S5, 19.1R3-S6, 19.2R1-S7, 19.2R3-S3, 19.3R2-S6, 19.3R3-S3, 19.4R1-S4, 19.4R3-S5, 20.1R2-S2, 20.1R3-S1, 20.2R3-S2, 20.3R3-S1, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1, and all subsequent releases."}], "source": {"advisory": "JSA11236", "defect": ["1561722"], "discovery": "USER"}, "work_around": [{"lang": "en", "value": "Configure a firewall filter to discard packets sourced from the internal network.\n\nDisabling the net.transit_re sysctl flag will also cause management traffic forwarded to the PFE ports to be dropped:\n % sysctl -w net.transit_re=0\n\nNote that sysctl flags do not survive a reboot."}]}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T22:55:53.697Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://kb.juniper.net/JSA11236"}]}]}, "cveMetadata": {"assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "assignerShortName": "juniper", "cveId": "CVE-2021-31371", "datePublished": "2021-10-19T18:17:05.112Z", "dateReserved": "2021-04-15T00:00:00.000Z", "dateUpdated": "2024-09-17T03:48:24.106Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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It was discovered that packets utilizing these IP addresses may egress an QFX5000 Series switch, leaking configuration information such as heartbeats, kernel versions, etc. out to the Internet, leading to an information exposure vulnerability. This issue affects Juniper Networks Junos OS on QFX5110, QFX5120, QFX5200, QFX5210 Series, and QFX5100 with QFX 5e Series image installed: All versions prior to 17.3R3-S12; 18.1 versions prior to 18.1R3-S13; 18.3 versions prior to 18.3R3-S5; 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 19.4R1-S4, 19.4R3-S5; 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-S1; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2;"}, {"lang": "es", "value": "El sistema operativo Junos de Juniper Networks utiliza la subred 128.0.0.0/2 para las comunicaciones internas entre el RE y los PFE. Se ha descubierto que los paquetes que utilizan estas direcciones IP pueden salir de un conmutador de la serie QFX5000, filtrando informaci\u00f3n de configuraci\u00f3n como los latidos del coraz\u00f3n, las versiones del kernel, etc. a Internet, lo que lleva a una vulnerabilidad de exposici\u00f3n de informaci\u00f3n. Este problema afecta al sistema operativo Junos de Juniper Networks en las series QFX5110, QFX5120, QFX5200, QFX5210 y QFX5100 con la imagen de la serie QFX 5e instalada: Todas las versiones anteriores a 17.3R3-S12; 18.1 versiones anteriores a 18.1R3-S13; 18.3 versiones anteriores a 18.3R3-S5; 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 19.4R1-S4, 19.4R3-S5; 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-S1; 20.4 versiones anteriores a 20.4R2-S1, 20.4R3; 21.1 versiones anteriores a 21.1R1-S1, 21.1R2;"}], "id": "CVE-2021-31371", "lastModified": "2026-06-17T03:51:39.563", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N", "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": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "sirt@juniper.net", "type": "Secondary"}]}, "published": "2021-10-19T19:15:10.277", "references": [{"source": "sirt@juniper.net", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://kb.juniper.net/JSA11236"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://kb.juniper.net/JSA11236"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "sirt@juniper.net", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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