{"id":"CVE-2021-31370","state":"PUBLISHED","title":"Junos OS: QFX5000 Series and EX4600 Series: Control traffic might be dropped if a high rate of specific multicast traffic is received","description":"An Incomplete List of Disallowed Inputs vulnerability in Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on QFX5000 Series and EX4600 Series allows an adjacent unauthenticated attacker which sends a high rate of specific multicast traffic to cause control traffic received from the network to be dropped. This will impact control protocols (including but not limited to routing-protocols) and lead to a Denial of Service (DoS). Continued receipt of this specific multicast traffic will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS on QFX5000 and EX4600 Series: All versions prior to 17.3R3-S12; 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 19.4R1-S4, 19.4R3-S3; 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-S2, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2.","publishedAt":"2021-10-19T18:17:02.210Z","updatedAt":"2024-09-17T01:26:52.896Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"juniper"},"assigner":"juniper","products":["Juniper Networks Junos OS"],"affected":[{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"unspecified","status":"affected","lessThan":"17.3R3-S12","versionType":"custom"},{"version":"17.4","status":"affected","lessThan":"17.4R3-S5","versionType":"custom"},{"version":"18.3","status":"affected","lessThan":"18.3R3-S5","versionType":"custom"},{"version":"18.4","status":"affected","lessThan":"18.4R3-S9","versionType":"custom"},{"version":"19.1","status":"affected","lessThan":"19.1R3-S6","versionType":"custom"},{"version":"19.2","status":"affected","lessThan":"19.2R1-S7, 19.2R3-S3","versionType":"custom"},{"version":"19.3","status":"affected","lessThan":"19.3R2-S6, 19.3R3-S3","versionType":"custom"},{"version":"19.4","status":"affected","lessThan":"19.4R1-S4, 19.4R3-S3","versionType":"custom"},{"version":"20.1","status":"affected","lessThan":"20.1R2-S2, 20.1R3-S1","versionType":"custom"},{"version":"20.2","status":"affected","lessThan":"20.2R3-S2","versionType":"custom"},{"version":"20.3","status":"affected","lessThan":"20.3R3","versionType":"custom"},{"version":"20.4","status":"affected","lessThan":"20.4R2-S2, 20.4R3","versionType":"custom"},{"version":"21.1","status":"affected","lessThan":"21.1R1-S1, 21.1R2","versionType":"custom"}],"platforms":["QFX5000 Series, EX4600 Series"]}],"references":["https://kb.juniper.net/JSA11232"],"weaknesses":["CWE-184"],"ingestedAt":"2026-10-29T19:48:30.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/31xxx/CVE-2021-31370.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-31370","state":"PUBLISHED","datePublished":"2021-10-19T18:17:02.210Z","dateUpdated":"2024-09-17T01:26:52.896Z","assignerShortName":"juniper","assignerOrgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","dateReserved":"2021-04-15T00:00:00.000Z"},"containers":{"cna":{"title":"Junos OS: QFX5000 Series and EX4600 Series: Control traffic might be dropped if a high rate of specific multicast traffic is received","descriptions":[{"lang":"en","value":"An Incomplete List of Disallowed Inputs vulnerability in Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on QFX5000 Series and EX4600 Series allows an adjacent unauthenticated attacker which sends a high rate of specific multicast traffic to cause control traffic received from the network to be dropped. This will impact control protocols (including but not limited to routing-protocols) and lead to a Denial of Service (DoS). Continued receipt of this specific multicast traffic will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS on QFX5000 and EX4600 Series: All versions prior to 17.3R3-S12; 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 19.4R1-S4, 19.4R3-S3; 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-S2, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2."}],"affected":[{"vendor":"Juniper Networks","product":"Junos 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on such filters in https://www.rfc-editor.org/rfc/rfc6192 and in \"Hardening Junos Devices, 2nd Edition\" at https://www.juniper.net/documentation/jnbooks/us/en/day-one-books"}],"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-2021-31370","STATE":"PUBLIC","TITLE":"Junos OS: QFX5000 Series and EX4600 Series: Control traffic might be dropped if a high rate of specific multicast traffic is received"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Junos OS","version":{"version_data":[{"platform":"QFX5000 Series, EX4600 Series","version_affected":"<","version_value":"17.3R3-S12"},{"platform":"QFX5000 Series, EX4600 Series","version_affected":"<","version_name":"17.4","version_value":"17.4R3-S5"},{"platform":"QFX5000 Series, EX4600 Series","version_affected":"<","version_name":"18.3","version_value":"18.3R3-S5"},{"platform":"QFX5000 Series, EX4600 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This will impact control protocols (including but not limited to routing-protocols) and lead to a Denial of Service (DoS). Continued receipt of this specific multicast traffic will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS on QFX5000 and EX4600 Series: All versions prior to 17.3R3-S12; 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 19.4R1-S4, 19.4R3-S3; 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-S2, 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":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-184: Incomplete List of Disallowed Inputs"}]},{"description":[{"lang":"eng","value":"Denial of Service (DoS)"}]}]},"references":{"reference_data":[{"name":"https://kb.juniper.net/JSA11232","refsource":"CONFIRM","url":"https://kb.juniper.net/JSA11232"}]},"solution":[{"lang":"en","value":"The following software releases have been updated to resolve this specific issue: 17.3R3-S12, 17.4R3-S5, 18.3R3-S5, 18.4R3-S9, 19.1R3-S6, 19.2R1-S7, 19.2R3-S3, 19.3R2-S6, 19.3R3-S3, 19.4R1-S4, 19.4R3-S3, 20.1R2-S2, 20.1R3-S1, 20.2R3-S2, 20.3R3, 20.4R2-S2, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1, and all subsequent releases."}],"source":{"advisory":"JSA11232","defect":["1576488"],"discovery":"USER"},"work_around":[{"lang":"en","value":"Please ensure you have a loopback filter applied to drop unneeded multicast traffic.\n\nYou can find further information on such filters in https://www.rfc-editor.org/rfc/rfc6192 and in \"Hardening Junos Devices, 2nd Edition\" at https://www.juniper.net/documentation/jnbooks/us/en/day-one-books"}]}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://kb.juniper.net/JSA11232","tags":["x_refsource_CONFIRM","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T22:55:53.791Z"}}]}}}