{"api_version":"1","generated_at":"2026-04-22T23:31:23+00:00","cve":"CVE-2021-0280","urls":{"html":"https://cve.report/CVE-2021-0280","api":"https://cve.report/api/cve/CVE-2021-0280.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-0280","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-0280"},"summary":{"title":"CVE-2021-0280","description":"Due to an Improper Initialization vulnerability in Juniper Networks Junos OS on PTX platforms and QFX10K Series with Paradise (PE) chipset-based line cards, ddos-protection configuration changes made from the CLI will not take effect as expected beyond the default DDoS (Distributed Denial of Service) settings in the Packet Forwarding Engine (PFE). This may cause BFD sessions to flap when a high rate of specific packets are received. Flapping of BFD sessions in turn may impact routing protocols and network stability, leading to a Denial of Service (DoS) condition. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects only the following platforms with Paradise (PE) chipset-based line cards: PTX1000, PTX3000 (NextGen), PTX5000, PTX10008, PTX10016 Series and QFX10002 Series. This issue affects: Juniper Networks Junos OS 17.4 versions prior to 17.4R3-S5 on PTX Series, QFX10K Series; 18.2 versions prior to 18.2R3-S8 on PTX Series, QFX10K Series; 18.3 versions prior to 18.3R3-S5 on PTX Series, QFX10K Series; 18.4 versions prior to 18.4R2-S8 on PTX Series, QFX10K Series; 19.1 versions prior to 19.1R3-S5 on PTX Series, QFX10K Series; 19.2 versions prior to 19.2R3-S2 on PTX Series, QFX10K Series; 19.3 versions prior to 19.3R3-S2 on PTX Series, QFX10K Series; 19.4 versions prior to 19.4R3-S2 on PTX Series, QFX10K Series; 20.1 versions prior to 20.1R3 on PTX Series, QFX10K Series; 20.2 versions prior to 20.2R2-S3, 20.2R3 on PTX Series, QFX10K Series; 20.3 versions prior to 20.3R2 on PTX Series, QFX10K Series; 20.4 versions prior to 20.4R2 on PTX Series, QFX10K Series.","state":"PUBLIC","assigner":"sirt@juniper.net","published_at":"2021-07-15 20:15:00","updated_at":"2021-07-28 15:20:00"},"problem_types":["CWE-665"],"metrics":[],"references":[{"url":"https://kb.juniper.net/JSA11184","name":"https://kb.juniper.net/JSA11184","refsource":"CONFIRM","tags":[],"title":"2021-07 Security Bulletin: Junos OS: PTX Series and QFX10K Series: Upon receipt of specific packets BFD sessions might flap due to DDoS policer implementation in Packet Forwarding Engine (CVE-2021-0280) - Juniper Networks","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-0280","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-0280","name":"NVD vulnerability 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Junos Multiple Vulnerability (JSA11181,JSA11177,JSA11182,JSA11184,JSA11186)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"sirt@juniper.net","DATE_PUBLIC":"2021-07-14T16:00:00.000Z","ID":"CVE-2021-0280","STATE":"PUBLIC","TITLE":"Junos OS: PTX Series, QFX10K Series: Upon receipt of specific packets BFD sessions might flap due to DDoS policer implementation in Packet Forwarding Engine"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Junos OS","version":{"version_data":[{"platform":"PTX Series, QFX10K Series","version_affected":"<","version_name":"17.4","version_value":"17.4R3-S5"},{"platform":"PTX Series, QFX10K Series","version_affected":"<","version_name":"18.2","version_value":"18.2R3-S8"},{"platform":"PTX Series, QFX10K Series","version_affected":"<","version_name":"18.3","version_value":"18.3R3-S5"},{"platform":"PTX Series, QFX10K Series","version_affected":"<","version_name":"18.4","version_value":"18.4R2-S8"},{"platform":"PTX Series, QFX10K Series","version_affected":"<","version_name":"19.1","version_value":"19.1R3-S5"},{"platform":"PTX Series, QFX10K Series","version_affected":"<","version_name":"19.2","version_value":"19.2R3-S2"},{"platform":"PTX Series, QFX10K Series","version_affected":"<","version_name":"19.3","version_value":"19.3R3-S2"},{"platform":"PTX Series, QFX10K Series","version_affected":"<","version_name":"19.4","version_value":"19.4R3-S2"},{"platform":"PTX Series, QFX10K Series","version_affected":"<","version_name":"20.1","version_value":"20.1R3"},{"platform":"PTX Series, QFX10K Series","version_affected":"<","version_name":"20.2","version_value":"20.2R2-S3, 20.2R3"},{"platform":"PTX Series, QFX10K Series","version_affected":"<","version_name":"20.3","version_value":"20.3R2, 20.3R3"},{"platform":"PTX Series, QFX10K Series","version_affected":"<","version_name":"20.4","version_value":"20.4R2"}]}}]},"vendor_name":"Juniper Networks"}]}},"configuration":[{"lang":"eng","value":"The examples of the config stanza affected by this issue:\n\n  [system ddos-protection global]\n  [system ddos-protection protocols]"}],"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Due to an Improper Initialization vulnerability in Juniper Networks Junos OS on PTX platforms and QFX10K Series with Paradise (PE) chipset-based line cards, ddos-protection configuration changes made from the CLI will not take effect as expected beyond the default DDoS (Distributed Denial of Service) settings in the Packet Forwarding Engine (PFE). This may cause BFD sessions to flap when a high rate of specific packets are received. Flapping of BFD sessions in turn may impact routing protocols and network stability, leading to a Denial of Service (DoS) condition. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects only the following platforms with Paradise (PE) chipset-based line cards: PTX1000, PTX3000 (NextGen), PTX5000, PTX10008, PTX10016 Series and QFX10002 Series. This issue affects: Juniper Networks Junos OS 17.4 versions prior to 17.4R3-S5 on PTX Series, QFX10K Series; 18.2 versions prior to 18.2R3-S8 on PTX Series, QFX10K Series; 18.3 versions prior to 18.3R3-S5 on PTX Series, QFX10K Series; 18.4 versions prior to 18.4R2-S8 on PTX Series, QFX10K Series; 19.1 versions prior to 19.1R3-S5 on PTX Series, QFX10K Series; 19.2 versions prior to 19.2R3-S2 on PTX Series, QFX10K Series; 19.3 versions prior to 19.3R3-S2 on PTX Series, QFX10K Series; 19.4 versions prior to 19.4R3-S2 on PTX Series, QFX10K Series; 20.1 versions prior to 20.1R3 on PTX Series, QFX10K Series; 20.2 versions prior to 20.2R2-S3, 20.2R3 on PTX Series, QFX10K Series; 20.3 versions prior to 20.3R2 on PTX Series, QFX10K Series; 20.4 versions prior to 20.4R2 on PTX Series, QFX10K Series."}]},"exploit":[{"lang":"eng","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":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/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-665 Improper Initialization"}]}]},"references":{"reference_data":[{"name":"https://kb.juniper.net/JSA11184","refsource":"CONFIRM","url":"https://kb.juniper.net/JSA11184"}]},"solution":[{"lang":"eng","value":"The following software releases have been updated to resolve this specific issue: Junos OS 17.4R3-S5, 18.2R3-S8, 18.3R3-S5, 18.4R2-S8, 19.1R3-S5, 19.2R3-S2, 19.3R3-S2, 19.4R3-S2, 20.1R3, 20.2R2-S3, 20.2R3, 20.3R2, 20.4R2, 21.1R1, and all subsequent releases.\n"}],"source":{"advisory":"JSA11184","defect":["1564807"],"discovery":"USER"},"work_around":[{"lang":"eng","value":"The default ukern policer rate can be reduced by the CLI command:\n  set system ddos-protection protocols <protocol-group> <aggregate | packet-type> bandwidth <packets-per-second> burst <size> \n\n\n       \n"}]},"nvd":{"publishedDate":"2021-07-15 20:15:00","lastModifiedDate":"2021-07-28 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to an Improper Initialization vulnerability in Juniper Networks Junos OS on PTX platforms and QFX10K Series with Paradise (PE) chipset-based line cards, ddos-protection configuration changes made from the CLI will not take effect as expected beyond the default DDoS (Distributed Denial of Service) settings in the Packet Forwarding Engine (PFE). This may cause BFD sessions to flap when a high rate of specific packets are received. Flapping of BFD sessions in turn may impact routing protocols and network stability, leading to a Denial of Service (DoS) condition. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects only the following platforms with Paradise (PE) chipset-based line cards: PTX1000, PTX3000 (NextGen), PTX5000, PTX10008, PTX10016 Series and QFX10002 Series. This issue affects: Juniper Networks Junos OS 17.4 versions prior to 17.4R3-S5 on PTX Series, QFX10K Series; 18.2 versions prior to 18.2R3-S8 on PTX Series, QFX10K Series; 18.3 versions prior to 18.3R3-S5 on PTX Series, QFX10K Series; 18.4 versions prior to 18.4R2-S8 on PTX Series, QFX10K Series; 19.1 versions prior to 19.1R3-S5 on PTX Series, QFX10K Series; 19.2 versions prior to 19.2R3-S2 on PTX Series, QFX10K Series; 19.3 versions prior to 19.3R3-S2 on PTX Series, QFX10K Series; 19.4 versions prior to 19.4R3-S2 on PTX Series, QFX10K Series; 20.1 versions prior to 20.1R3 on PTX Series, QFX10K Series; 20.2 versions prior to 20.2R2-S3, 20.2R3 on PTX Series, QFX10K Series; 20.3 versions prior to 20.3R2 on PTX Series, QFX10K Series; 20.4 versions prior to 20.4R2 on PTX Series, QFX10K Series.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"280","Ordinal":"2","NoteData":"2021-07-15","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"280","Ordinal":"3","NoteData":"2021-07-15","Type":"Other","Title":"Modified"}]}}}