{"id":"CVE-2021-0211","state":"PUBLISHED","title":"Junos OS and Junos OS Evolved: Upon receipt of a specific BGP FlowSpec message network traffic may be disrupted.","description":"An improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Evolved Routing Protocol Daemon (RPD) service allows an attacker to send a valid BGP FlowSpec message thereby causing an unexpected change in the route advertisements within the BGP FlowSpec domain leading to disruptions in network traffic causing a Denial of Service (DoS) condition. Continued receipt of these update messages will cause a sustained Denial of Service condition. This issue affects Juniper Networks: Junos OS: All versions prior to 17.3R3-S10 with the exceptions of 15.1X49-D240 on SRX Series and 15.1R7-S8 on EX Series; 17.3 versions prior to 17.3R3-S10; 17.4 versions prior to 17.4R2-S12, 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R2-S8, 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S6; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S3; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R2-S5, 19.3R3-S1; 19.4 versions prior to 19.4R1-S3, 19.4R2-S3, 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R1-S3 20.2R2; 20.3 versions prior to 20.3R1-S1, 20.3R2. Junos OS Evolved: All versions prior to 20.3R1-S1-EVO, 20.3R2-EVO.","publishedAt":"2021-01-15T17:35:57.520Z","updatedAt":"2024-09-16T20:52:46.854Z","severity":{"score":10,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H","source":"juniper"},"assigner":"juniper","products":["Juniper Networks Junos OS","Juniper Networks Junos OS Evolved"],"affected":[{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"15.1","status":"affected","lessThan":"15.1R7-S8","versionType":"custom"}],"platforms":["EX Series"]},{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"17.3","status":"affected","lessThan":"17.3R3-S10","versionType":"custom"},{"version":"17.4","status":"affected","lessThan":"17.4R2-S12, 17.4R3-S4","versionType":"custom"},{"version":"18.1","status":"affected","lessThan":"18.1R3-S12","versionType":"custom"},{"version":"18.2","status":"affected","lessThan":"18.2R2-S8, 18.2R3-S6","versionType":"custom"},{"version":"18.3","status":"affected","lessThan":"18.3R3-S4","versionType":"custom"},{"version":"18.4","status":"affected","lessThan":"18.4R1-S8, 18.4R2-S6, 18.4R3-S6","versionType":"custom"},{"version":"19.1","status":"affected","lessThan":"19.1R1-S6, 19.1R2-S2, 19.1R3-S3","versionType":"custom"},{"version":"19.2","status":"affected","lessThan":"19.2R3-S1","versionType":"custom"},{"version":"19.3","status":"affected","lessThan":"19.3R2-S5, 19.3R3-S1","versionType":"custom"},{"version":"19.4","status":"affected","lessThan":"19.4R1-S3, 19.4R2-S3, 19.4R3","versionType":"custom"},{"version":"20.1","status":"affected","lessThan":"20.1R2","versionType":"custom"},{"version":"20.2","status":"affected","lessThan":"20.2R1-S3 20.2R2","versionType":"custom"},{"version":"20.3","status":"affected","lessThan":"20.3R1-S1, 20.3R2","versionType":"custom"}]},{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"15.1X49","status":"affected","lessThan":"15.1X490-D240","versionType":"custom"}],"platforms":["SRX Series"]},{"vendor":"Juniper Networks","product":"Junos OS Evolved","versions":[{"version":"unspecified","status":"affected","lessThan":"20.3R1-S1-EVO, 20.3R2-EVO","versionType":"custom"}]}],"references":["https://kb.juniper.net/JSA11101"],"weaknesses":[],"ingestedAt":"2026-10-29T19:47:50.134Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/0xxx/CVE-2021-0211.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-0211","state":"PUBLISHED","datePublished":"2021-01-15T17:35:57.520Z","dateUpdated":"2024-09-16T20:52:46.854Z","assignerShortName":"juniper","assignerOrgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","dateReserved":"2020-10-27T00:00:00.000Z"},"containers":{"cna":{"title":"Junos OS and Junos OS Evolved: Upon receipt of a specific BGP FlowSpec message network traffic may be disrupted.","descriptions":[{"lang":"en","value":"An improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Evolved Routing Protocol Daemon (RPD) service allows an attacker to send a valid BGP FlowSpec message thereby causing an unexpected change in the route advertisements within the BGP FlowSpec domain leading to disruptions in network traffic causing a Denial of Service (DoS) condition. Continued receipt of these update messages will cause a sustained Denial of Service condition. This issue affects Juniper Networks: Junos OS: All versions prior to 17.3R3-S10 with the exceptions of 15.1X49-D240 on SRX Series and 15.1R7-S8 on EX Series; 17.3 versions prior to 17.3R3-S10; 17.4 versions prior to 17.4R2-S12, 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R2-S8, 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S6; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S3; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R2-S5, 19.3R3-S1; 19.4 versions prior to 19.4R1-S3, 19.4R2-S3, 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R1-S3 20.2R2; 20.3 versions prior to 20.3R1-S1, 20.3R2. Junos OS Evolved: All versions prior to 20.3R1-S1-EVO, 20.3R2-EVO."}],"affected":[{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"15.1","status":"affected","lessThan":"15.1R7-S8","versionType":"custom"}],"platforms":["EX Series"]},{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"17.3","status":"affected","lessThan":"17.3R3-S10","versionType":"custom"},{"version":"17.4","status":"affected","lessThan":"17.4R2-S12, 17.4R3-S4","versionType":"custom"},{"version":"18.1","status":"affected","lessThan":"18.1R3-S12","versionType":"custom"},{"version":"18.2","status":"affected","lessThan":"18.2R2-S8, 18.2R3-S6","versionType":"custom"},{"version":"18.3","status":"affected","lessThan":"18.3R3-S4","versionType":"custom"},{"version":"18.4","status":"affected","lessThan":"18.4R1-S8, 18.4R2-S6, 18.4R3-S6","versionType":"custom"},{"version":"19.1","status":"affected","lessThan":"19.1R1-S6, 19.1R2-S2, 19.1R3-S3","versionType":"custom"},{"version":"19.2","status":"affected","lessThan":"19.2R3-S1","versionType":"custom"},{"version":"19.3","status":"affected","lessThan":"19.3R2-S5, 19.3R3-S1","versionType":"custom"},{"version":"19.4","status":"affected","lessThan":"19.4R1-S3, 19.4R2-S3, 19.4R3","versionType":"custom"},{"version":"20.1","status":"affected","lessThan":"20.1R2","versionType":"custom"},{"version":"20.2","status":"affected","lessThan":"20.2R1-S3 20.2R2","versionType":"custom"},{"version":"20.3","status":"affected","lessThan":"20.3R1-S1, 20.3R2","versionType":"custom"}]},{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"15.1X49","status":"affected","lessThan":"15.1X490-D240","versionType":"custom"}],"platforms":["SRX Series"]},{"vendor":"Juniper Networks","product":"Junos OS Evolved","versions":[{"version":"unspecified","status":"affected","lessThan":"20.3R1-S1-EVO, 20.3R2-EVO","versionType":"custom"}]}],"references":[{"url":"https://kb.juniper.net/JSA11101","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"description":"754 - Improper Check for Unusual or Exceptional Conditions","lang":"en","type":"text"}]},{"descriptions":[{"description":"Denial of Service (DoS)","lang":"en","type":"text"}]}],"providerMetadata":{"shortName":"juniper","dateUpdated":"2021-01-15T17:35:57.000Z","orgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968"},"configurations":[{"lang":"en","value":"The following minimal configuration is required to potentially hit this issue:\n\n  protocols bgp family inet flow"}],"datePublic":"2021-01-13T00:00:00.000Z","exploits":[{"lang":"en","value":"Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}],"solutions":[{"lang":"en","value":"The following software releases have been updated to resolve this specific issue: \n\nJunos OS: 15.1R7-S8, 15.1X49-D240, 17.3R3-S10, 17.4R2-S12, 17.4R3-S4, 18.1R3-S12, 18.2R2-S8, 18.2R3-S6, 18.3R3-S4, 18.4R1-S8, 18.4R2-S6, 18.4R3-S6, 19.1R2-S2, 19.1R3-S3, 19.2R3-S1, 19.3R2-S5, 19.3R3-S1, 19.4R1-S3, 19.4R2-S3, 19.4R3, 20.1R2, 20.2R1-S3, 20.2R2, 20.3R1-S1, 20.3R2, 20.4R1, and all subsequent releases.\n\nJunos OS Evolved: 20.3R1-S1-EVO, 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases."}],"source":{"advisory":"JSA11101","defect":["1539109"],"discovery":"USER"},"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":"2021-01-13T17:00:00.000Z","ID":"CVE-2021-0211","STATE":"PUBLIC","TITLE":"Junos OS and Junos OS Evolved: Upon receipt of a specific BGP FlowSpec message network traffic may be disrupted."},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Junos OS","version":{"version_data":[{"platform":"EX Series","version_affected":"<","version_name":"15.1","version_value":"15.1R7-S8"},{"version_affected":"<","version_name":"17.3","version_value":"17.3R3-S10"},{"version_affected":"<","version_name":"17.4","version_value":"17.4R2-S12, 17.4R3-S4"},{"version_affected":"<","version_name":"18.1","version_value":"18.1R3-S12"},{"version_affected":"<","version_name":"18.2","version_value":"18.2R2-S8, 18.2R3-S6"},{"version_affected":"<","version_name":"18.3","version_value":"18.3R3-S4"},{"version_affected":"<","version_name":"18.4","version_value":"18.4R1-S8, 18.4R2-S6, 18.4R3-S6"},{"version_affected":"<","version_name":"19.1","version_value":"19.1R1-S6, 19.1R2-S2, 19.1R3-S3"},{"version_affected":"<","version_name":"19.2","version_value":"19.2R3-S1"},{"version_affected":"<","version_name":"19.3","version_value":"19.3R2-S5, 19.3R3-S1"},{"version_affected":"<","version_name":"19.4","version_value":"19.4R1-S3, 19.4R2-S3, 19.4R3"},{"version_affected":"<","version_name":"20.1","version_value":"20.1R2"},{"version_affected":"<","version_name":"20.2","version_value":"20.2R1-S3 20.2R2"},{"version_affected":"<","version_name":"20.3","version_value":"20.3R1-S1, 20.3R2"},{"platform":"SRX Series","version_affected":"<","version_name":"15.1X49","version_value":"15.1X490-D240"}]}},{"product_name":"Junos OS Evolved","version":{"version_data":[{"version_affected":"<","version_value":"20.3R1-S1-EVO, 20.3R2-EVO"}]}}]},"vendor_name":"Juniper Networks"}]}},"configuration":[{"lang":"en","value":"The following minimal configuration is required to potentially hit this issue:\n\n  protocols bgp family inet flow"}],"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"An improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Evolved Routing Protocol Daemon (RPD) service allows an attacker to send a valid BGP FlowSpec message thereby causing an unexpected change in the route advertisements within the BGP FlowSpec domain leading to disruptions in network traffic causing a Denial of Service (DoS) condition. Continued receipt of these update messages will cause a sustained Denial of Service condition. This issue affects Juniper Networks: Junos OS: All versions prior to 17.3R3-S10 with the exceptions of 15.1X49-D240 on SRX Series and 15.1R7-S8 on EX Series; 17.3 versions prior to 17.3R3-S10; 17.4 versions prior to 17.4R2-S12, 17.4R3-S4; 18.1 versions prior to 18.1R3-S12; 18.2 versions prior to 18.2R2-S8, 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R1-S8, 18.4R2-S6, 18.4R3-S6; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S3; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R2-S5, 19.3R3-S1; 19.4 versions prior to 19.4R1-S3, 19.4R2-S3, 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R1-S3 20.2R2; 20.3 versions prior to 20.3R1-S1, 20.3R2. Junos OS Evolved: All versions prior to 20.3R1-S1-EVO, 20.3R2-EVO."}]},"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":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"754 - Improper Check for Unusual or Exceptional Conditions"}]},{"description":[{"lang":"eng","value":"Denial of Service (DoS)"}]}]},"references":{"reference_data":[{"name":"https://kb.juniper.net/JSA11101","refsource":"CONFIRM","url":"https://kb.juniper.net/JSA11101"}]},"solution":[{"lang":"en","value":"The following software releases have been updated to resolve this specific issue: \n\nJunos OS: 15.1R7-S8, 15.1X49-D240, 17.3R3-S10, 17.4R2-S12, 17.4R3-S4, 18.1R3-S12, 18.2R2-S8, 18.2R3-S6, 18.3R3-S4, 18.4R1-S8, 18.4R2-S6, 18.4R3-S6, 19.1R2-S2, 19.1R3-S3, 19.2R3-S1, 19.3R2-S5, 19.3R3-S1, 19.4R1-S3, 19.4R2-S3, 19.4R3, 20.1R2, 20.2R1-S3, 20.2R2, 20.3R1-S1, 20.3R2, 20.4R1, and all subsequent releases.\n\nJunos OS Evolved: 20.3R1-S1-EVO, 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases."}],"source":{"advisory":"JSA11101","defect":["1539109"],"discovery":"USER"},"work_around":[{"lang":"en","value":"There are no viable workarounds for this issue."}]}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://kb.juniper.net/JSA11101","tags":["x_refsource_CONFIRM","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T15:32:10.098Z"}}]}}}