CVE-2021-0269

{"containers": {"cna": {"affected": [{"product": "Junos OS", "vendor": "Juniper Networks", "versions": [{"lessThan": "17.4R3-S3", "status": "affected", "version": "unspecified", "versionType": "custom"}, {"lessThan": "18.1R3-S12", "status": "affected", "version": "18.1", "versionType": "custom"}, {"lessThan": "18.2R3-S6", "status": "affected", "version": "18.2", "versionType": "custom"}, {"lessThan": "18.3R3-S4", "status": "affected", "version": "18.3", "versionType": "custom"}, {"lessThan": "18.4R3-S6", "status": "affected", "version": "18.4", "versionType": "custom"}, {"lessThan": "19.1R3-S4", "status": "affected", "version": "19.1", "versionType": "custom"}, {"lessThan": "19.2R3-S1", "status": "affected", "version": "19.2", "versionType": "custom"}, {"lessThan": "19.3R3-S1", "status": "affected", "version": "19.3", "versionType": "custom"}, {"lessThan": "19.4R2-S2, 19.4R3", "status": "affected", "version": "19.4", "versionType": "custom"}, {"lessThan": "20.1R2", "status": "affected", "version": "20.1", "versionType": "custom"}, {"lessThan": "20.2R2", "status": "affected", "version": "20.2", "versionType": "custom"}]}], "configurations": [{"lang": "en", "value": "This issue requires J-Web to be enabled on the device.\n\nThe examples of the config stanza affected by this issue:\n [system services web-management http]\n [system services web-management https]"}], "datePublic": "2021-04-14T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "The improper handling of client-side parameters in J-Web of Juniper Networks Junos OS allows an attacker to perform a number of different malicious actions against a target device when a user is authenticated to J-Web. An attacker may be able to supersede existing parameters, including hardcoded parameters within the HTTP/S session, access and exploit variables, bypass web application firewall rules or input validation mechanisms, and otherwise alter and modify J-Web's normal behavior. An attacker may be able to transition victims to malicious web services, or exfiltrate sensitive information from otherwise secure web forms. This issue affects: Juniper Networks Junos OS: All versions prior to 17.4R3-S3; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R2-S2, 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2."}], "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": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-233", "description": "CWE-233: Improper Handling of Parameters", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-04-22T19:37:25.000Z", "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://kb.juniper.net/JSA11160"}], "solutions": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: 17.4R3-S3, 18.1R3-S12, 18.2R3-S6, 18.3R3-S4, 18.4R3-S6, 19.1R3-S4, 19.2R3-S1, 19.3R3-S1, 19.4R2-S2, 19.4R3, 20.1R2, 20.2R2, 20.3R1, and all subsequent releases."}], "source": {"advisory": "JSA11160", "defect": ["1501588"], "discovery": "INTERNAL"}, "title": "Junos OS: J-Web can be compromised through reflected client-side HTTP parameter pollution attacks.", "workarounds": [{"lang": "en", "value": "To reduce the risk of exploitation utilize common security BCPs to limit the exploitable surface by limiting access to network and device to trusted systems, administrators, networks and hosts. \n\nAccess the J-Web service from trusted hosts which may not be compromised by cross-site scripting attacks, for example, deploying jump hosts with no internet access.\n\nAlternatively, disable J-Web."}], "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-2021-0269", "STATE": "PUBLIC", "TITLE": "Junos OS: J-Web can be compromised through reflected client-side HTTP parameter pollution attacks."}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Junos OS", "version": {"version_data": [{"version_affected": "<", "version_value": "17.4R3-S3"}, {"version_affected": "<", "version_name": "18.1", "version_value": "18.1R3-S12"}, {"version_affected": "<", "version_name": "18.2", "version_value": "18.2R3-S6"}, {"version_affected": "<", "version_name": "18.3", "version_value": "18.3R3-S4"}, {"version_affected": "<", "version_name": "18.4", "version_value": "18.4R3-S6"}, {"version_affected": "<", "version_name": "19.1", "version_value": "19.1R3-S4"}, {"version_affected": "<", "version_name": "19.2", "version_value": "19.2R3-S1"}, {"version_affected": "<", "version_name": "19.3", "version_value": "19.3R3-S1"}, {"version_affected": "<", "version_name": "19.4", "version_value": "19.4R2-S2, 19.4R3"}, {"version_affected": "<", "version_name": "20.1", "version_value": "20.1R2"}, {"version_affected": "<", "version_name": "20.2", "version_value": "20.2R2"}]}}]}, "vendor_name": "Juniper Networks"}]}}, "configuration": [{"lang": "en", "value": "This issue requires J-Web to be enabled on the device.\n\nThe examples of the config stanza affected by this issue:\n [system services web-management http]\n [system services web-management https]"}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "The improper handling of client-side parameters in J-Web of Juniper Networks Junos OS allows an attacker to perform a number of different malicious actions against a target device when a user is authenticated to J-Web. An attacker may be able to supersede existing parameters, including hardcoded parameters within the HTTP/S session, access and exploit variables, bypass web application firewall rules or input validation mechanisms, and otherwise alter and modify J-Web's normal behavior. An attacker may be able to transition victims to malicious web services, or exfiltrate sensitive information from otherwise secure web forms. This issue affects: Juniper Networks Junos OS: All versions prior to 17.4R3-S3; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R2-S2, 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2."}]}, "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": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-233: Improper Handling of Parameters"}]}]}, "references": {"reference_data": [{"name": "https://kb.juniper.net/JSA11160", "refsource": "MISC", "url": "https://kb.juniper.net/JSA11160"}]}, "solution": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: 17.4R3-S3, 18.1R3-S12, 18.2R3-S6, 18.3R3-S4, 18.4R3-S6, 19.1R3-S4, 19.2R3-S1, 19.3R3-S1, 19.4R2-S2, 19.4R3, 20.1R2, 20.2R2, 20.3R1, and all subsequent releases."}], "source": {"advisory": "JSA11160", "defect": ["1501588"], "discovery": "INTERNAL"}, "work_around": [{"lang": "en", "value": "To reduce the risk of exploitation utilize common security BCPs to limit the exploitable surface by limiting access to network and device to trusted systems, administrators, networks and hosts. \n\nAccess the J-Web service from trusted hosts which may not be compromised by cross-site scripting attacks, for example, deploying jump hosts with no internet access.\n\nAlternatively, disable J-Web."}]}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T15:32:10.516Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://kb.juniper.net/JSA11160"}]}]}, "cveMetadata": {"assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "assignerShortName": "juniper", "cveId": "CVE-2021-0269", "datePublished": "2021-04-22T19:37:25.649Z", "dateReserved": "2020-10-27T00:00:00.000Z", "dateUpdated": "2024-09-17T01:12:12.544Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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"matchCriteriaId": "D3C23AEB-34DE-44FB-8D64-E69D6E8B7401", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:20.2:r1-s2:*:*:*:*:*:*", "matchCriteriaId": "18DB9401-5A51-4BB3-AC2F-58F58F1C788C", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:20.2:r1-s3:*:*:*:*:*:*", "matchCriteriaId": "06F53DA5-59AE-403C-9B1E-41CE267D8BB1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The improper handling of client-side parameters in J-Web of Juniper Networks Junos OS allows an attacker to perform a number of different malicious actions against a target device when a user is authenticated to J-Web. An attacker may be able to supersede existing parameters, including hardcoded parameters within the HTTP/S session, access and exploit variables, bypass web application firewall rules or input validation mechanisms, and otherwise alter and modify J-Web's normal behavior. An attacker may be able to transition victims to malicious web services, or exfiltrate sensitive information from otherwise secure web forms. This issue affects: Juniper Networks Junos OS: All versions prior to 17.4R3-S3; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R2-S2, 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2."}, {"lang": "es", "value": "El manejo inapropiado de los par\u00e1metros client-side en J-Web de Juniper Networks Junos OS, permite a un atacante llevar a cabo una serie de diferentes acciones maliciosas contra un dispositivo objetivo cuando un usuario est\u00e1 autenticado en J-Web.&#xa0;Un atacante puede ser capaz de reemplazar los par\u00e1metros existentes, incluyendo los par\u00e1metros embebidos dentro de la sesi\u00f3n HTTP/S, las variables de acceso y explotaci\u00f3n, la omisi\u00f3n de las reglas de firewall de aplicaciones web o los mecanismos de comprobaci\u00f3n de entrada, y de otro modo alterar y modificar el comportamiento normal de J-Web.&#xa0;Un atacante puede ser capaz de transferir a las v\u00edctimas a servicios web maliciosos o exfiltrar informaci\u00f3n confidencial de formularios web que de otro modo ser\u00edan seguros.&#xa0;Este problema afecta a: Juniper Networks Junos OS: todas las versiones anteriores a 17.4R3-S3;&#xa0;versiones 18.1 anteriores a 18.1R3-S12;&#xa0;versiones 18.2 anteriores a 18.2R3-S6;&#xa0;versiones 18.3 anteriores a 18.3R3-S4;&#xa0;versiones 18.4 anteriores a 18.4R3-S6;&#xa0;versiones 19.1 anteriores a 19.1R3-S4;&#xa0;versiones 19.2 anteriores a 19.2R3-S1;&#xa0;versiones 19.3 anteriores a 19.3R3-S1;&#xa0;versiones 19.4 anteriores a 19.4R2-S2, 19.4R3;&#xa0;versiones 20.1 anteriores a 20.1R2;&#xa0;versiones 20.2 anteriores a 20.2R2"}], "id": "CVE-2021-0269", "lastModified": "2026-06-17T03:29:39.910", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "HIGH", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.1, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:H/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 4.9, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "sirt@juniper.net", "type": "Secondary"}]}, "published": "2021-04-22T20:15:09.980", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11160"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11160"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-233"}], "source": "sirt@juniper.net", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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