{"schemaVersion":3,"id":"CVE-2021-0211","aliases":[],"status":"published","duplicateOf":null,"title":null,"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, 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Check for Unusual or Exceptional Conditions","description":"The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.","type":"weakness","status":"Incomplete","abstraction":"Class","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/754.html"}],"affected":[{"vendor":"juniper networks","product":"junos os","name":"Junos OS","label":"junos os","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 15.1, < 15.1R7-S8","noFixRecorded":false,"fixedIn":null},{"text":"≥ 17.3, < 17.3R3-S10","noFixRecorded":false,"fixedIn":null},{"text":"≥ 17.4, < 17.4R2-S12, 17.4R3-S4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 18.1, < 18.1R3-S12","noFixRecorded":false,"fixedIn":null},{"text":"≥ 18.2, < 18.2R2-S8, 18.2R3-S6","noFixRecorded":false,"fixedIn":null},{"text":"≥ 18.3, < 18.3R3-S4","noFixRecorded":false,"fixedIn":null},{"text":"≥ 18.4, < 18.4R1-S8, 18.4R2-S6, 18.4R3-S6","noFixRecorded":false,"fixedIn":null},{"text":"≥ 19.1, < 19.1R1-S6, 19.1R2-S2, 19.1R3-S3","noFixRecorded":false,"fixedIn":null},{"text":"≥ 19.2, < 19.2R3-S1","noFixRecorded":false,"fixedIn":null},{"text":"≥ 19.3, < 19.3R2-S5, 19.3R3-S1","noFixRecorded":false,"fixedIn":null},{"text":"≥ 19.4, < 19.4R1-S3, 19.4R2-S3, 19.4R3","noFixRecorded":false,"fixedIn":null},{"text":"≥ 20.1, < 20.1R2","noFixRecorded":false,"fixedIn":null},{"text":"≥ 20.2, < 20.2R1-S3 20.2R2","noFixRecorded":false,"fixedIn":null},{"text":"≥ 20.3, < 20.3R1-S1, 20.3R2","noFixRecorded":false,"fixedIn":null},{"text":"≥ 15.1X49, < 15.1X490-D240","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 15.1, < 15.1R7-S8 | ≥ 17.3, < 17.3R3-S10 | ≥ 17.4, < 17.4R2-S12, 17.4R3-S4 | ≥ 18.1, < 18.1R3-S12 | ≥ 18.2, < 18.2R2-S8, 18.2R3-S6 | ≥ 18.3, < 18.3R3-S4 | ≥ 18.4, < 18.4R1-S8, 18.4R2-S6, 18.4R3-S6 | ≥ 19.1, < 19.1R1-S6, 19.1R2-S2, 19.1R3-S3 | ≥ 19.2, < 19.2R3-S1 | ≥ 19.3, < 19.3R2-S5, 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18.3:r3 | 18.3:r3-s1 | 18.3:r3-s2 | 18.3:r3-s3 | 18.4 | 18.4:r1 | 18.4:r1-s1 | 18.4:r1-s2 | 18.4:r1-s3 | 18.4:r1-s4 | 18.4:r1-s5 | 18.4:r1-s6 | 18.4:r1-s7 | 18.4:r2 | 18.4:r2-s1 | 18.4:r2-s2 | 18.4:r2-s3 | 18.4:r2-s4 | 18.4:r2-s5 | 18.4:r3 | 18.4:r3-s1 | 18.4:r3-s2 | 18.4:r3-s3 | 18.4:r3-s4 | 18.4:r3-s5 | 19.1 | 19.1:r1 | 19.1:r1-s1 | 19.1:r1-s2 | 19.1:r1-s3 | 19.1:r1-s4 | 19.1:r1-s5 | 19.1:r2 | 19.1:r2-s1 | 19.1:r3 | 19.1:r3-s1 | 19.1:r3-s2 | 19.2 | 19.2:r1 | 19.2:r1-s1 | 19.2:r1-s2 | 19.2:r1-s3 | 19.2:r1-s4 | 19.2:r2 | 19.2:r3 | 19.3 | 19.3:r1 | 19.3:r1-s1 | 19.3:r2 | 19.3:r2-s1 | 19.3:r2-s2 | 19.3:r2-s3 | 19.3:r2-s4 | 19.3:r3 | 19.4:r1 | 19.4:r1-s1 | 19.4:r1-s2 | 19.4:r2 | 19.4:r2-s1 | 19.4:r2-s2 | 20.1:r1 | 20.1:r1-s1 | 20.1:r1-s2 | 20.1:r1-s3 | 20.2:r1 | 20.2:r1-s1 | 20.2:r1-s2 | 20.3:r1 | 15.1x49 | 15.1x49:d10 | 15.1x49:d100 | 15.1x49:d110 | 15.1x49:d120 | 15.1x49:d130 | 15.1x49:d131 | 15.1x49:d140 | 15.1x49:d15 | 15.1x49:d150 | 15.1x49:d160 | 15.1x49:d170 | 15.1x49:d180 | 15.1x49:d190 | 15.1x49:d20 | 15.1x49:d200 | 15.1x49:d210 | 15.1x49:d25 | 15.1x49:d30 | 15.1x49:d35 | 15.1x49:d40 | 15.1x49:d45 | 15.1x49:d50 | 15.1x49:d55 | 15.1x49:d60 | 15.1x49:d65 | 15.1x49:d70 | 15.1x49:d75 | 15.1x49:d80 | 15.1x49:d90 | 15.1x49-d30 | 15.1x49-d60 | 15.1x49-d140 | 15.1x49-d150 | 15.1x49-d160 | 15.1 | 15.1:a1 | 15.1:f | 15.1:f1 | 15.1:f2 | 15.1:f2-s1 | 15.1:f2-s2 | 15.1:f2-s3 | 15.1:f2-s4 | 15.1:f3 | 15.1:f4 | 15.1:f5 | 15.1:f5-s7 | 15.1:f6 | 15.1:f6-s1 | 15.1:f6-s10 | 15.1:f6-s12 | 15.1:f6-s2 | 15.1:f6-s3 | 15.1:f6-s4 | 15.1:f6-s5 | 15.1:f6-s6 | 15.1:f6-s7 | 15.1:f6-s8 | 15.1:f6-s9 | 15.1:f7 | 15.1:r | 15.1:r1 | 15.1:r2 | 15.1:r3 | 15.1:r4 | 15.1:r4-s7 | 15.1:r4-s8 | 15.1:r4-s9 | 15.1:r5 | 15.1:r5-s1 | 15.1:r5-s3 | 15.1:r5-s5 | 15.1:r5-s6 | 15.1:r6 | 15.1:r6-s1 | 15.1:r6-s2 | 15.1:r6-s3 | 15.1:r6-s4 | 15.1:r6-s6 | 15.1:r7 | 15.1:r7-s1 | 15.1:r7-s10 | 15.1:r7-s11 | 15.1:r7-s2 | 15.1:r7-s3 | 15.1:r7-s4 | 15.1:r7-s5 | 15.1:r7-s6 | 15.1:r7-s7","eol":null,"hubHref":"/vendor/juniper/junos"},{"vendor":"juniper","product":"junos_os_evolved","name":"junos os evolved","label":"junos_os_evolved","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"19.2:r1","noFixRecorded":false,"fixedIn":null},{"text":"19.2:r2","noFixRecorded":false,"fixedIn":null},{"text":"19.3:r2","noFixRecorded":false,"fixedIn":null},{"text":"19.4:r1","noFixRecorded":false,"fixedIn":null},{"text":"19.4:r2","noFixRecorded":false,"fixedIn":null},{"text":"19.4:r2-s1","noFixRecorded":false,"fixedIn":null},{"text":"20.1","noFixRecorded":false,"fixedIn":null},{"text":"20.1:r1","noFixRecorded":false,"fixedIn":null},{"text":"20.2","noFixRecorded":false,"fixedIn":null},{"text":"20.3:r1","noFixRecorded":false,"fixedIn":null}],"versionsText":"19.2:r1 | 19.2:r2 | 19.3:r2 | 19.4:r1 | 19.4:r2 | 19.4:r2-s1 | 20.1 | 20.1:r1 | 20.2 | 20.3:r1","eol":null,"hubHref":"/vendor/juniper/junos_os_evolved"}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://kb.juniper.net/JSA11101","label":"kb.juniper.net/JSA11101","hostname":"kb.juniper.net","tags":["X Refsource CONFIRM","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2021-01-15T17:35:57.520Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-09-16T20:52:46.854Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T16:24:48.217Z","stale":false,"partial":false}}