{"id":"CVE-2021-0224","state":"PUBLISHED","title":"Junos OS: ANCPD core when hitting maximum-discovery-table-entries limit","description":"A vulnerability in the handling of internal resources necessary to bring up a large number of Layer 2 broadband remote access subscriber (BRAS) nodes in Juniper Networks Junos OS can cause the Access Node Control Protocol daemon (ANCPD) to crash and restart, leading to a Denial of Service (DoS) condition. Continued processing of spoofed subscriber nodes will create a sustained Denial of Service (DoS) condition. When the number of subscribers attempting to connect exceeds the configured maximum-discovery-table-entries value, the subscriber fails to map to an internal neighbor entry, causing the ANCPD process to crash. This issue affects Juniper Networks Junos OS: All versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R2-S13; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R1-S8, 18.4R3-S8; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S2; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2; 20.3 versions prior to 20.3R2.","publishedAt":"2021-04-22T19:36:55.180Z","updatedAt":"2024-09-16T20:16:55.041Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"juniper"},"assigner":"juniper","products":["Juniper Networks Junos OS"],"affected":[{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"All","status":"affected","lessThan":"17.3R3-S12","versionType":"custom"},{"version":"17.4","status":"affected","lessThan":"17.4R2-S13","versionType":"custom"},{"version":"18.1","status":"affected","lessThan":"18.1R3-S13","versionType":"custom"},{"version":"18.2","status":"affected","lessThan":"18.2R3-S8","versionType":"custom"},{"version":"18.3","status":"affected","lessThan":"18.3R3-S5","versionType":"custom"},{"version":"18.4","status":"affected","lessThan":"18.4R1-S8, 18.4R3-S8","versionType":"custom"},{"version":"19.1","status":"affected","lessThan":"19.1R3-S4","versionType":"custom"},{"version":"19.2","status":"affected","lessThan":"19.2R3-S2","versionType":"custom"},{"version":"19.3","status":"affected","lessThan":"19.3R3-S1","versionType":"custom"},{"version":"19.4","status":"affected","lessThan":"19.4R3-S1","versionType":"custom"},{"version":"20.1","status":"affected","lessThan":"20.1R2","versionType":"custom"},{"version":"20.2","status":"affected","lessThan":"20.2R2","versionType":"custom"},{"version":"20.3","status":"affected","lessThan":"20.3R2","versionType":"custom"}]}],"references":["https://kb.juniper.net/JSA11119"],"weaknesses":["CWE-770"],"ingestedAt":"2026-10-29T19:47:50.134Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/0xxx/CVE-2021-0224.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-0224","state":"PUBLISHED","datePublished":"2021-04-22T19:36:55.180Z","dateUpdated":"2024-09-16T20:16:55.041Z","assignerShortName":"juniper","assignerOrgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","dateReserved":"2020-10-27T00:00:00.000Z"},"containers":{"cna":{"title":"Junos OS: ANCPD core when hitting maximum-discovery-table-entries limit","descriptions":[{"lang":"en","value":"A vulnerability in the handling of internal resources necessary to bring up a large number of Layer 2 broadband remote access subscriber (BRAS) nodes in Juniper Networks Junos OS can cause the Access Node Control Protocol daemon (ANCPD) to crash and restart, leading to a Denial of Service (DoS) condition. Continued processing of spoofed subscriber nodes will create a sustained Denial of Service (DoS) condition. When the number of subscribers attempting to connect exceeds the configured maximum-discovery-table-entries value, the subscriber fails to map to an internal neighbor entry, causing the ANCPD process to crash. This issue affects Juniper Networks Junos OS: All versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R2-S13; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R1-S8, 18.4R3-S8; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S2; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2; 20.3 versions prior to 20.3R2."}],"affected":[{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"All","status":"affected","lessThan":"17.3R3-S12","versionType":"custom"},{"version":"17.4","status":"affected","lessThan":"17.4R2-S13","versionType":"custom"},{"version":"18.1","status":"affected","lessThan":"18.1R3-S13","versionType":"custom"},{"version":"18.2","status":"affected","lessThan":"18.2R3-S8","versionType":"custom"},{"version":"18.3","status":"affected","lessThan":"18.3R3-S5","versionType":"custom"},{"version":"18.4","status":"affected","lessThan":"18.4R1-S8, 18.4R3-S8","versionType":"custom"},{"version":"19.1","status":"affected","lessThan":"19.1R3-S4","versionType":"custom"},{"version":"19.2","status":"affected","lessThan":"19.2R3-S2","versionType":"custom"},{"version":"19.3","status":"affected","lessThan":"19.3R3-S1","versionType":"custom"},{"version":"19.4","status":"affected","lessThan":"19.4R3-S1","versionType":"custom"},{"version":"20.1","status":"affected","lessThan":"20.1R2","versionType":"custom"},{"version":"20.2","status":"affected","lessThan":"20.2R2","versionType":"custom"},{"version":"20.3","status":"affected","lessThan":"20.3R2","versionType":"custom"}]}],"references":[{"url":"https://kb.juniper.net/JSA11119","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","description":"CWE-770 Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}]},{"descriptions":[{"description":"Denial of Service (DoS)","lang":"en","type":"text"}]}],"providerMetadata":{"shortName":"juniper","dateUpdated":"2021-04-22T19:36:55.000Z","orgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968"},"configurations":[{"lang":"en","value":"Configurations that may be vulnerable to this issue are those where a maximum number of discovery table entries are configured.  For example:\n  [protocols ancp maximum-discovery-table-entries]"}],"datePublic":"2021-04-14T00:00:00.000Z","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: Junos OS 17.3R3-S12, 17.4R2-S13, 18.2R3-S8, 18.4R1-S8, 18.4R3-S8, 19.1R3-S4, 19.2R3-S2, 19.3R3-S1, 19.4R3-S1, 20.1R2, 20.1R3, 20.2R2, 20.2R3, 20.3R2, 20.4R1, and all subsequent releases."}],"source":{"advisory":"JSA11119","defect":["1544746"],"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":"2021-04-14T16:00:00.000Z","ID":"CVE-2021-0224","STATE":"PUBLIC","TITLE":"Junos OS: ANCPD core when hitting maximum-discovery-table-entries limit"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Junos OS","version":{"version_data":[{"version_affected":"<","version_name":"All","version_value":"17.3R3-S12"},{"version_affected":"<","version_name":"17.4","version_value":"17.4R2-S13"},{"version_affected":"<","version_name":"18.1","version_value":"18.1R3-S13"},{"version_affected":"<","version_name":"18.2","version_value":"18.2R3-S8"},{"version_affected":"<","version_name":"18.3","version_value":"18.3R3-S5"},{"version_affected":"<","version_name":"18.4","version_value":"18.4R1-S8, 18.4R3-S8"},{"version_affected":"<","version_name":"19.1","version_value":"19.1R3-S4"},{"version_affected":"<","version_name":"19.2","version_value":"19.2R3-S2"},{"version_affected":"<","version_name":"19.3","version_value":"19.3R3-S1"},{"version_affected":"<","version_name":"19.4","version_value":"19.4R3-S1"},{"version_affected":"<","version_name":"20.1","version_value":"20.1R2"},{"version_affected":"<","version_name":"20.2","version_value":"20.2R2"},{"version_affected":"<","version_name":"20.3","version_value":"20.3R2"}]}}]},"vendor_name":"Juniper Networks"}]}},"configuration":[{"lang":"en","value":"Configurations that may be vulnerable to this issue are those where a maximum number of discovery table entries are configured.  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This issue affects Juniper Networks Junos OS: All versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R2-S13; 18.1 versions prior to 18.1R3-S13; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R1-S8, 18.4R3-S8; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R3-S2; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2; 20.3 versions prior to 20.3R2."}]},"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":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/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-770 Allocation of Resources Without Limits or Throttling"}]},{"description":[{"lang":"eng","value":"Denial of Service (DoS)"}]}]},"references":{"reference_data":[{"name":"https://kb.juniper.net/JSA11119","refsource":"MISC","url":"https://kb.juniper.net/JSA11119"}]},"solution":[{"lang":"en","value":"The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S12, 17.4R2-S13, 18.2R3-S8, 18.4R1-S8, 18.4R3-S8, 19.1R3-S4, 19.2R3-S2, 19.3R3-S1, 19.4R3-S1, 20.1R2, 20.1R3, 20.2R2, 20.2R3, 20.3R2, 20.4R1, and all subsequent releases."}],"source":{"advisory":"JSA11119","defect":["1544746"],"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/JSA11119","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T15:32:10.201Z"}}]}}}