{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2021-31365", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-31365", "idYear": 2021, "status": "PUBLISHED", "publishedAt": "2021-10-19T18:16:53.840Z", "updatedAt": "2024-09-16T20:52:01.404Z", "importedAt": "2026-10-24T01:56:32.228Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "Junos OS: EX2300, EX3400 and EX4300 Series: An Aggregated Ethernet (AE) interface will go down due to a stream of specific layer 2 frames", "summary": "An Uncontrolled Resource Consumption vulnerability in Juniper Networks Junos OS on EX2300, EX3400 and EX4300 Series platforms allows an adjacent attacker sending a stream of layer 2 frames will trigger an Aggregated Ethernet (AE) interface to go down and thereby causing a Denial of Service (DoS). By continuously sending a stream of specific layer 2 frames an attacker will sustain the Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS EX4300 Series All versions prior to 15.1R7-S7; 16.1 versions prior to 16.1R7-S8; 17.1 versions prior to 17.1R2-S12; 17.2 versions prior to 17.2R3-S4; 17.3 versions prior to 17.3R3-S8; 17.4 versions prior to 17.4R2-S10, 17.4R3-S2; 18.1 versions prior to 18.1R3-S10; 18.2 versions prior to 18.2R2-S7, 18.2R3-S3; 18.3 versions prior to 18.3R2-S4, 18.3R3-S2; 18.4 versions prior to 18.4R1-S7, 18.4R2-S4, 18.4R3-S1; 19.1 versions prior to 19.1R1-S5, 19.1R2-S1, 19.1R3; 19.2 versions prior to 19.2R1-S5, 19.2R2; 19.3 versions prior to 19.3R2-S2, 19.3R3; 19.4 versions prior to 19.4R1-S2, 19.4R2. Juniper Networks Junos OS EX3400 and EX4300-MP Series All versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R3-S7; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R2-S9, 18.4R3-S7; 19.1 versions prior to 19.1R2-S3, 19.1R3-S4; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R2. Juniper Networks Junos OS EX2300 Series All versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R2-S9, 18.4R3-S9; 19.1 versions prior to 19.1R2-S3, 19.1R3-S6; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S7, 19.3R3-S3; 19.4 versions prior to 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 21.1R2.", "affected": [ { "vendor": "Juniper Networks", "product": "Junos OS", "platforms": [ "EX4300 Series" ], "versions": [ { "version": "unspecified", "status": "affected", "versionType": "custom", "lessThan": "15.1R7-S7" }, { "version": "16.1", "status": "affected", "versionType": "custom", "lessThan": "16.1R7-S8" }, { "version": "17.1", "status": "affected", "versionType": "custom", "lessThan": "17.1R2-S12" }, { "version": "17.2", "status": "affected", "versionType": "custom", "lessThan": "17.2R3-S4" }, { "version": "17.3", "status": "affected", "versionType": "custom", "lessThan": "17.3R3-S8" }, { "version": "17.4", "status": "affected", "versionType": "custom", "lessThan": "17.4R2-S10, 17.4R3-S2" }, { "version": "18.1", "status": "affected", "versionType": "custom", "lessThan": "18.1R3-S10" }, { "version": "18.2", "status": "affected", "versionType": "custom", "lessThan": "18.2R2-S7, 18.2R3-S3" }, { "version": "18.3", "status": "affected", "versionType": "custom", "lessThan": "18.3R2-S4, 18.3R3-S2" }, { "version": "18.4", "status": "affected", "versionType": "custom", "lessThan": "18.4R1-S7, 18.4R2-S4, 18.4R3-S1" }, { "version": "19.1", "status": "affected", "versionType": "custom", "lessThan": "19.1R1-S5, 19.1R2-S1, 19.1R3" }, { "version": "19.2", "status": "affected", "versionType": "custom", "lessThan": "19.2R1-S5, 19.2R2" }, { "version": "19.3", "status": "affected", "versionType": "custom", "lessThan": "19.3R2-S2, 19.3R3" }, { "version": "19.4", "status": "affected", "versionType": "custom", "lessThan": "19.4R1-S2, 19.4R2" } ] }, { "vendor": "Juniper Networks", "product": "Junos OS", "platforms": [ "EX3400 Series, EX4300-MP Series" ], "versions": [ { "version": "unspecified", "status": "affected", "versionType": "custom", "lessThan": "18.1R3-S12" }, { "version": "18.2", "status": "affected", "versionType": "custom", "lessThan": "18.2R3-S7" }, { "version": "18.3", "status": "affected", "versionType": "custom", "lessThan": "18.3R3-S4" }, { "version": "18.4", "status": "affected", "versionType": "custom", "lessThan": "18.4R2-S9, 18.4R3-S7" }, { "version": "19.1", "status": "affected", "versionType": "custom", "lessThan": "19.1R2-S3, 19.1R3-S4" }, { "version": "19.2", "status": "affected", "versionType": "custom", "lessThan": "19.2R3-S1" }, { "version": "19.3", "status": "affected", "versionType": "custom", "lessThan": "19.3R3-S1" }, { "version": "19.4", "status": "affected", "versionType": "custom", "lessThan": "19.4R3-S1" }, { "version": "20.1", "status": "affected", "versionType": "custom", "lessThan": "20.1R3" }, { "version": "20.2", "status": "affected", "versionType": "custom", "lessThan": "20.2R3" }, { "version": "20.3", "status": "affected", "versionType": "custom", "lessThan": "20.3R2" } ] }, { "vendor": "Juniper Networks", "product": "Junos OS", "platforms": [ "EX2300 Series" ], "versions": [ { "version": "unspecified", "status": "affected", "versionType": "custom", "lessThan": "18.3R3-S5" }, { "version": "18.4", "status": "affected", "versionType": "custom", "lessThan": "18.4R2-S9, 18.4R3-S9" }, { "version": "19.1", "status": "affected", "versionType": "custom", "lessThan": "19.1R2-S3, 19.1R3-S6" }, { "version": "19.2", "status": "affected", "versionType": "custom", "lessThan": "19.2R1-S7, 19.2R3-S3" }, { "version": "19.3", "status": "affected", "versionType": "custom", "lessThan": "19.3R2-S7, 19.3R3-S3" }, { "version": "19.4", "status": "affected", "versionType": "custom", "lessThan": "19.4R3-S5" }, { "version": "20.1", "status": "affected", "versionType": "custom", "lessThan": "20.1R2-S2, 20.1R3-S1" }, { "version": "20.2", "status": "affected", "versionType": "custom", "lessThan": "20.2R3-S2" }, { "version": "20.3", "status": "affected", "versionType": "custom", "lessThan": "20.3R3-S1" }, { "version": "20.4", "status": "affected", "versionType": "custom", "lessThan": "20.4R2-S1, 20.4R3" }, { "version": "21.1", "status": "affected", "versionType": "custom", "lessThan": "21.1R2" } ] } ] } } }