{ "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-2021-31361", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-31361", "idYear": 2021, "status": "PUBLISHED", "publishedAt": "2021-10-19T18:16:47.475Z", "updatedAt": "2024-09-17T03:44:15.899Z", "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: QFX Series and PTX Series: FPC resource usage increases when certain packets are processed which are being VXLAN encapsulated", "summary": "An Improper Check for Unusual or Exceptional Conditions vulnerability combined with Improper Handling of Exceptional Conditions in Juniper Networks Junos OS on QFX Series and PTX Series allows an unauthenticated network based attacker to cause increased FPC CPU utilization by sending specific IP packets which are being VXLAN encapsulated leading to a partial Denial of Service (DoS). Continued receipted of these specific traffic will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS on QFX Series: All versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R2-S13, 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R2-S8, 18.2R3-S7; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S7, 18.4R3-S7; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S2; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R2-S3, 19.4R3-S1; 20.1 versions prior to 20.1R2, 20.1R3; 20.2 versions prior to 20.2R2, 20.2R3; 20.3 versions prior to 20.3R1-S1, 20.3R2. Juniper Networks Junos OS on PTX Series: All 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-S5; 20.1 versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R3-S1; 20.3 versions prior to 20.3R2-S1, 20.3R3; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2.", "affected": [ { "vendor": "Juniper Networks", "product": "Junos OS", "platforms": [ "QFX Series" ], "versions": [ { "version": "unspecified", "status": "affected", "versionType": "custom", "lessThan": "17.3R3-S11" }, { "version": "17.4", "status": "affected", "versionType": "custom", "lessThan": "17.4R2-S13, 17.4R3-S4" }, { "version": "18.1", "status": "affected", "versionType": "custom", "lessThan": "18.1R3-S12" }, { "version": "18.2", "status": "affected", "versionType": "custom", "lessThan": "18.2R2-S8, 18.2R3-S7" }, { "version": "18.3", "status": "affected", "versionType": "custom", "lessThan": "18.3R3-S4" }, { "version": "18.4", "status": "affected", "versionType": "custom", "lessThan": "18.4R1-S8, 18.4R2-S7, 18.4R3-S7" }, { "version": "19.1", "status": "affected", "versionType": "custom", "lessThan": "19.1R1-S6, 19.1R2-S2, 19.1R3-S4" }, { "version": "19.2", "status": "affected", "versionType": "custom", "lessThan": "19.2R1-S6, 19.2R3-S2" }, { "version": "19.3", "status": "affected", "versionType": "custom", "lessThan": "19.3R3-S1" }, { "version": "19.4", "status": "affected", "versionType": "custom", "lessThan": "19.4R2-S3, 19.4R3-S1" }, { "version": "20.1", "status": "affected", "versionType": "custom", "lessThan": "20.1R2, 20.1R3" }, { "version": "20.2", "status": "affected", "versionType": "custom", "lessThan": "20.2R2, 20.2R3" }, { "version": "20.3", "status": "affected", "versionType": "custom", "lessThan": "20.3R1-S1, 20.3R2" } ] }, { "vendor": "Juniper Networks", "product": "Junos OS", "platforms": [ "PTX Series" ], "versions": [ { "version": "unspecified", "status": "affected", "versionType": "custom", "lessThan": "18.4R3-S9" }, { "version": "19.1", "status": "affected", "versionType": "custom", "lessThan": "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-S6, 19.3R3-S3" }, { "version": "19.4", "status": "affected", "versionType": "custom", "lessThan": "19.4R1-S4, 19.4R3-S5" }, { "version": "20.1", "status": "affected", "versionType": "custom", "lessThan": "20.1R2-S2, 20.1R3" }, { "version": "20.2", "status": "affected", "versionType": "custom", "lessThan": "20.2R3-S1" }, { "version": "20.3", "status": "affected", "versionType": "custom", "lessThan": "20.3R2-S1, 20.3R3" }, { "version": "20.4", "status": "affected", "versionType": "custom", "lessThan": "20.4R2-S1, 20.4R3" }, { "version": "21.1", "status": "affected", "versionType": "custom", "lessThan": "21.1R1-S1, 21.1R2" } ] } ] } } }