CVE-2021-0243

{"containers": {"cna": {"affected": [{"platforms": ["EX4300"], "product": "Junos OS", "vendor": "Juniper Networks", "versions": [{"lessThan": "17.3R3-S10", "status": "affected", "version": "unspecified", "versionType": "custom"}, {"lessThan": "17.4R3-S3", "status": "affected", "version": "17.4", "versionType": "custom"}, {"lessThan": "18.1R3-S11", "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-S3", "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": "19.4R3", "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": "A sample affected firewall policer configuration is shown below:\n\n set interfaces ge-0/0/1 unit 0 family ethernet-switching filter input TEST-Policer\n set firewall family ethernet-switching filter TEST-Policer term 1 from ip-source-address 10.1.1.0/24\n set firewall family ethernet-switching filter TEST-Policer term 1 then accept\n set firewall family ethernet-switching filter TEST-Policer term 1 then policer TEST-Policer-Bandwidth\n set firewall policer TEST-Policer-Bandwidth if-exceeding bandwidth-limit 50k\n set firewall policer TEST-Policer-Bandwidth if-exceeding burst-size-limit 1500\n set firewall policer TEST-Policer-Bandwidth then discard"}], "datePublic": "2021-04-14T00:00:00.000Z", "descriptions": [{"lang": "en", "value": "Improper Handling of Unexpected Data in the firewall policer of Juniper Networks Junos OS on EX4300 switches allows matching traffic to exceed set policer limits, possibly leading to a limited Denial of Service (DoS) condition. When the firewall policer discard action fails on a Layer 2 port, it will allow traffic to pass even though it exceeds set policer limits. Traffic will not get discarded, and will be forwarded even though a policer discard action is configured. When the issue occurs, traffic is not discarded as desired, which can be observed by comparing the Input bytes with the Output bytes using the following command: user@junos> monitor interface traffic Interface Link Input bytes (bps) Output bytes (bps) ge-0/0/0 Up 37425422 (82616) 37425354 (82616) <<<< egress ge-0/0/1 Up 37425898 (82616) 37425354 (82616) <<<< ingress The expected output, with input and output counters differing, is shown below: Interface Link Input bytes (bps) Output bytes (bps) ge-0/0/0 Up 342420570 (54600) 342422760 (54600) <<<< egress ge-0/0/1 Up 517672120 (84000) 342420570 (54600) <<<< ingress This issue only affects IPv4 policing. IPv6 traffic and firewall policing actions are not affected by this issue. This issue affects Juniper Networks Junos OS on the EX4300: All versions prior to 17.3R3-S10; 17.4 versions prior to 17.4R3-S3; 18.1 versions prior to 18.1R3-S11; 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-S3; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 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": "ADJACENT_NETWORK", "availabilityImpact": "LOW", "baseScore": 4.7, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-241", "description": "CWE-241 Improper Handling of Unexpected Data Type", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"description": "Denial of Service (DoS)", "lang": "en", "type": "text"}]}], "providerMetadata": {"dateUpdated": "2021-04-22T19:37:07.000Z", "orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper"}, "references": [{"tags": ["x_refsource_MISC"], "url": "https://kb.juniper.net/JSA11136"}], "solutions": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S10, 17.4R3-S3, 18.1R3-S11, 18.2R3-S6, 18.3R3-S4, 18.4R3-S6, 19.1R3-S3, 19.2R3-S1, 19.3R3-S1, 19.4R3, 20.1R2, 20.2R2, 20.3R1, and all subsequent releases."}], "source": {"advisory": "JSA11136", "defect": ["1532670"], "discovery": "USER"}, "title": "Junos OS: EX4300: Stateless firewall policer fails to discard traffic", "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-2021-0243", "STATE": "PUBLIC", "TITLE": "Junos OS: EX4300: Stateless firewall policer fails to discard traffic"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "Junos OS", "version": {"version_data": [{"platform": "EX4300", "version_affected": "<", "version_value": "17.3R3-S10"}, {"platform": "EX4300", "version_affected": "<", "version_name": "17.4", "version_value": "17.4R3-S3"}, {"platform": "EX4300", "version_affected": "<", "version_name": "18.1", "version_value": "18.1R3-S11"}, {"platform": "EX4300", "version_affected": "<", "version_name": "18.2", "version_value": "18.2R3-S6"}, {"platform": "EX4300", "version_affected": "<", "version_name": "18.3", "version_value": "18.3R3-S4"}, {"platform": "EX4300", "version_affected": "<", "version_name": "18.4", "version_value": "18.4R3-S6"}, {"platform": "EX4300", "version_affected": "<", "version_name": "19.1", "version_value": "19.1R3-S3"}, {"platform": "EX4300", "version_affected": "<", "version_name": "19.2", "version_value": "19.2R3-S1"}, {"platform": "EX4300", "version_affected": "<", "version_name": "19.3", "version_value": "19.3R3-S1"}, {"platform": "EX4300", "version_affected": "<", "version_name": "19.4", "version_value": "19.4R3"}, {"platform": "EX4300", "version_affected": "<", "version_name": "20.1", "version_value": "20.1R2"}, {"platform": "EX4300", "version_affected": "<", "version_name": "20.2", "version_value": "20.2R2"}]}}]}, "vendor_name": "Juniper Networks"}]}}, "configuration": [{"lang": "en", "value": "A sample affected firewall policer configuration is shown below:\n\n set interfaces ge-0/0/1 unit 0 family ethernet-switching filter input TEST-Policer\n set firewall family ethernet-switching filter TEST-Policer term 1 from ip-source-address 10.1.1.0/24\n set firewall family ethernet-switching filter TEST-Policer term 1 then accept\n set firewall family ethernet-switching filter TEST-Policer term 1 then policer TEST-Policer-Bandwidth\n set firewall policer TEST-Policer-Bandwidth if-exceeding bandwidth-limit 50k\n set firewall policer TEST-Policer-Bandwidth if-exceeding burst-size-limit 1500\n set firewall policer TEST-Policer-Bandwidth then discard"}], "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Improper Handling of Unexpected Data in the firewall policer of Juniper Networks Junos OS on EX4300 switches allows matching traffic to exceed set policer limits, possibly leading to a limited Denial of Service (DoS) condition. When the firewall policer discard action fails on a Layer 2 port, it will allow traffic to pass even though it exceeds set policer limits. Traffic will not get discarded, and will be forwarded even though a policer discard action is configured. When the issue occurs, traffic is not discarded as desired, which can be observed by comparing the Input bytes with the Output bytes using the following command: user@junos> monitor interface traffic Interface Link Input bytes (bps) Output bytes (bps) ge-0/0/0 Up 37425422 (82616) 37425354 (82616) <<<< egress ge-0/0/1 Up 37425898 (82616) 37425354 (82616) <<<< ingress The expected output, with input and output counters differing, is shown below: Interface Link Input bytes (bps) Output bytes (bps) ge-0/0/0 Up 342420570 (54600) 342422760 (54600) <<<< egress ge-0/0/1 Up 517672120 (84000) 342420570 (54600) <<<< ingress This issue only affects IPv4 policing. IPv6 traffic and firewall policing actions are not affected by this issue. This issue affects Juniper Networks Junos OS on the EX4300: All versions prior to 17.3R3-S10; 17.4 versions prior to 17.4R3-S3; 18.1 versions prior to 18.1R3-S11; 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-S3; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 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": "ADJACENT_NETWORK", "availabilityImpact": "LOW", "baseScore": 4.7, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-241 Improper Handling of Unexpected Data Type"}]}, {"description": [{"lang": "eng", "value": "Denial of Service (DoS)"}]}]}, "references": {"reference_data": [{"name": "https://kb.juniper.net/JSA11136", "refsource": "MISC", "url": "https://kb.juniper.net/JSA11136"}]}, "solution": [{"lang": "en", "value": "The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S10, 17.4R3-S3, 18.1R3-S11, 18.2R3-S6, 18.3R3-S4, 18.4R3-S6, 19.1R3-S3, 19.2R3-S1, 19.3R3-S1, 19.4R3, 20.1R2, 20.2R2, 20.3R1, and all subsequent releases."}], "source": {"advisory": "JSA11136", "defect": ["1532670"], "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": "2024-08-03T15:32:10.168Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://kb.juniper.net/JSA11136"}]}]}, "cveMetadata": {"assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "assignerShortName": "juniper", "cveId": "CVE-2021-0243", "datePublished": "2021-04-22T19:37:08.073Z", "dateReserved": "2020-10-27T00:00:00.000Z", "dateUpdated": "2024-09-17T00:51:52.928Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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"E594D6DC-87F6-40D2-8268-ED6021462168", "vulnerable": false}], "negate": false, "operator": "OR"}], "operator": "AND"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper Handling of Unexpected Data in the firewall policer of Juniper Networks Junos OS on EX4300 switches allows matching traffic to exceed set policer limits, possibly leading to a limited Denial of Service (DoS) condition. When the firewall policer discard action fails on a Layer 2 port, it will allow traffic to pass even though it exceeds set policer limits. Traffic will not get discarded, and will be forwarded even though a policer discard action is configured. When the issue occurs, traffic is not discarded as desired, which can be observed by comparing the Input bytes with the Output bytes using the following command: user@junos> monitor interface traffic Interface Link Input bytes (bps) Output bytes (bps) ge-0/0/0 Up 37425422 (82616) 37425354 (82616) <<<< egress ge-0/0/1 Up 37425898 (82616) 37425354 (82616) <<<< ingress The expected output, with input and output counters differing, is shown below: Interface Link Input bytes (bps) Output bytes (bps) ge-0/0/0 Up 342420570 (54600) 342422760 (54600) <<<< egress ge-0/0/1 Up 517672120 (84000) 342420570 (54600) <<<< ingress This issue only affects IPv4 policing. IPv6 traffic and firewall policing actions are not affected by this issue. This issue affects Juniper Networks Junos OS on the EX4300: All versions prior to 17.3R3-S10; 17.4 versions prior to 17.4R3-S3; 18.1 versions prior to 18.1R3-S11; 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-S3; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2."}, {"lang": "es", "value": "Un manejo inapropiado de Datos Inesperados en el firewall policer de Juniper Networks Junos OS, en los switches EX4300, permite que el tr\u00e1fico coincidente exceda los l\u00edmites establecidos de policer, posiblemente conllevando a una condici\u00f3n limitada de Denegaci\u00f3n de Servicio (DoS).&#xa0;Cuando la acci\u00f3n de descarte de firewall policer presenta un fallo en un puerto de Capa 2, permitir\u00e1 que pase el tr\u00e1fico aunque exceda los l\u00edmites establecidos de policer.&#xa0;El tr\u00e1fico no ser\u00e1 descartado y ser\u00e1 reenviado aunque una acci\u00f3n de descarte policer sea configurada.&#xa0;Cuando ocurre el problema, el tr\u00e1fico no se descarta como se desea, lo cual se puede observar comparando los bytes de entrada con los bytes de salida usando el siguiente comando: user@junos) monitor interface traffic Interface Link Input bytes (bps) Output bytes (bps) ge-0/0/0 Up 37425422 (82616) 37425354 (82616) (((( egress ge-0/0/1 Up 37425898 (82616) 37425354 (82616) (((( ingress The expected output, with input and output counters differing, is shown below: Interface Link Input bytes (bps) Output bytes (bps) ge-0/0/0 Up 342420570 (54600) 342422760 (54600) (((( egress ge-0/0/1 Up 517672120 (84000) 342420570 (54600) (((( ingress. Este problema solo afecta a la generaci\u00f3n de pol\u00edtcaIPv4.&#xa0;El tr\u00e1fico IPv6 y las acciones de generaci\u00f3n de pol\u00edtica del firewall no est\u00e1 afectadas por este problema.&#xa0;Este problema afecta a Juniper Networks Junos OS en la Serie EX4300: todas las versiones anteriores a 17.3R3-S10;&#xa0;versiones 17.4 anteriores a 17.4R3-S3;&#xa0;versiones 18.1 anteriores a 18.1R3-S11;&#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-S3;&#xa0;versiones 19.2 anteriores a 19.2R3-S1;&#xa0;versiones 19.3 anteriores a 19.3R3-S1;&#xa0;versiones 19.4 anteriores a 19.4R3;&#xa0;versiones 20.1 anteriores a 20.1R2;&#xa0;versiones 20.2 anteriores a 20.2R2"}], "id": "CVE-2021-0243", "lastModified": "2026-06-17T03:29:35.183", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "LOW", "accessVector": "ADJACENT_NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 3.3, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:A/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 6.5, "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": "LOW", "baseScore": 4.7, "baseSeverity": "MEDIUM", "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:L", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "sirt@juniper.net", "type": "Secondary"}]}, "published": "2021-04-22T20:15:09.093", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11136"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA11136"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-241"}], "source": "sirt@juniper.net", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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