{"id":"CVE-2021-31351","state":"PUBLISHED","title":"Junos OS: MX Series: Receipt of specific packet on MS-MPC/MS-MIC causes line card reset","description":"An Improper Check for Unusual or Exceptional Conditions in packet processing on the MS-MPC/MS-MIC utilized by Juniper Networks Junos OS allows a malicious attacker to send a specific packet, triggering the MS-MPC/MS-MIC to reset, causing a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects specific versions of Juniper Networks Junos OS on MX Series: 17.3R3-S11; 17.4R2-S13; 17.4R3 prior to 17.4R3-S5; 18.1R3-S12; 18.2R2-S8, 18.2R3-S7, 18.2R3-S8; 18.3R3-S4; 18.4R3-S7; 19.1R3-S4, 19.1R3-S5; 19.2R1-S6; 19.3R3-S2; 19.4R2-S4, 19.4R2-S5; 19.4R3-S2; 20.1R2-S1; 20.2R2-S2, 20.2R2-S3, 20.2R3; 20.3R2, 20.3R2-S1; 20.4R1, 20.4R1-S1, 20.4R2; 21.1R1; This issue does not affect any version of Juniper Networks Junos OS prior to 15.1X49-D240;","publishedAt":"2021-10-19T18:16:31.714Z","updatedAt":"2024-09-17T01:26:12.258Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/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":"unspecified","status":"unaffected","lessThan":"15.1","versionType":"custom"},{"version":"17.3","status":"unaffected","lessThan":"17.3R3-S11","versionType":"custom"},{"version":"17.4R3","status":"unaffected","lessThan":"17.4*","versionType":"custom"}]},{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"17.3R3-S11","status":"affected"},{"version":"18.1R3-S12","status":"affected"},{"version":"18.3R3-S4","status":"affected"},{"version":"18.4R3-S7","status":"affected"},{"version":"19.1R3-S4, 19.1R3-S5","status":"affected"},{"version":"19.2R1-S6","status":"affected"},{"version":"19.3R3-S2","status":"affected"},{"version":"19.4R3-S2","status":"affected"},{"version":"20.1R2-S1","status":"affected"},{"version":"20.2R3","status":"affected"},{"version":"20.3R2","status":"affected"},{"version":"17.4R2-S13","status":"affected","lessThan":"17.4*","versionType":"custom"},{"version":"18.2R2-S8, 18.2R3-S7","status":"affected","lessThan":"18.2*","versionType":"custom"},{"version":"18.4R1-S8, 18.4R2-S7","status":"affected","lessThan":"18.4*","versionType":"custom"},{"version":"19.4R2-S4","status":"affected","lessThan":"19.4*","versionType":"custom"},{"version":"20.2R2-S2","status":"affected","lessThan":"20.2*","versionType":"custom"},{"version":"20.3R1-S2","status":"affected","lessThan":"20.3*","versionType":"custom"},{"version":"20.4","status":"affected","lessThan":"20.4R2-S1, 20.4R3","versionType":"custom"},{"version":"21.1","status":"affected","lessThan":"21.1R1-S1, 21.1R2","versionType":"custom"}],"platforms":["MX Series"]}],"references":["https://kb.juniper.net/JSA11216"],"weaknesses":["CWE-754"],"ingestedAt":"2026-10-29T19:48:30.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/31xxx/CVE-2021-31351.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-31351","state":"PUBLISHED","datePublished":"2021-10-19T18:16:31.714Z","dateUpdated":"2024-09-17T01:26:12.258Z","assignerShortName":"juniper","assignerOrgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","dateReserved":"2021-04-15T00:00:00.000Z"},"containers":{"cna":{"title":"Junos OS: MX Series: Receipt of specific packet on MS-MPC/MS-MIC causes line card reset","descriptions":[{"lang":"en","value":"An Improper Check for Unusual or Exceptional Conditions in packet processing on the MS-MPC/MS-MIC utilized by Juniper Networks Junos OS allows a malicious attacker to send a specific packet, triggering the MS-MPC/MS-MIC to reset, causing a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects specific versions of Juniper Networks Junos OS on MX Series: 17.3R3-S11; 17.4R2-S13; 17.4R3 prior to 17.4R3-S5; 18.1R3-S12; 18.2R2-S8, 18.2R3-S7, 18.2R3-S8; 18.3R3-S4; 18.4R3-S7; 19.1R3-S4, 19.1R3-S5; 19.2R1-S6; 19.3R3-S2; 19.4R2-S4, 19.4R2-S5; 19.4R3-S2; 20.1R2-S1; 20.2R2-S2, 20.2R2-S3, 20.2R3; 20.3R2, 20.3R2-S1; 20.4R1, 20.4R1-S1, 20.4R2; 21.1R1; This issue does not affect any version of Juniper Networks Junos OS prior to 15.1X49-D240;"}],"affected":[{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"unspecified","status":"unaffected","lessThan":"15.1","versionType":"custom"},{"version":"17.3","status":"unaffected","lessThan":"17.3R3-S11","versionType":"custom"},{"version":"17.4R3","status":"unaffected","lessThan":"17.4*","versionType":"custom"}]},{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"17.3R3-S11","status":"affected"},{"version":"18.1R3-S12","status":"affected"},{"version":"18.3R3-S4","status":"affected"},{"version":"18.4R3-S7","status":"affected"},{"version":"19.1R3-S4, 19.1R3-S5","status":"affected"},{"version":"19.2R1-S6","status":"affected"},{"version":"19.3R3-S2","status":"affected"},{"version":"19.4R3-S2","status":"affected"},{"version":"20.1R2-S1","status":"affected"},{"version":"20.2R3","status":"affected"},{"version":"20.3R2","status":"affected"},{"version":"17.4R2-S13","status":"affected","lessThan":"17.4*","versionType":"custom"},{"version":"18.2R2-S8, 18.2R3-S7","status":"affected","lessThan":"18.2*","versionType":"custom"},{"version":"18.4R1-S8, 18.4R2-S7","status":"affected","lessThan":"18.4*","versionType":"custom"},{"version":"19.4R2-S4","status":"affected","lessThan":"19.4*","versionType":"custom"},{"version":"20.2R2-S2","status":"affected","lessThan":"20.2*","versionType":"custom"},{"version":"20.3R1-S2","status":"affected","lessThan":"20.3*","versionType":"custom"},{"version":"20.4","status":"affected","lessThan":"20.4R2-S1, 20.4R3","versionType":"custom"},{"version":"21.1","status":"affected","lessThan":"21.1R1-S1, 21.1R2","versionType":"custom"}],"platforms":["MX Series"]}],"references":[{"url":"https://kb.juniper.net/JSA11216","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-754","description":"CWE-754 Improper Check for Unusual or Exceptional Conditions","lang":"en","type":"CWE"}]},{"descriptions":[{"description":"Denial of Service (DoS)","lang":"en","type":"text"}]}],"providerMetadata":{"shortName":"juniper","dateUpdated":"2021-10-19T18:16:31.000Z","orgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968"},"datePublic":"2021-10-13T00:00:00.000Z","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: Junos OS 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.3R3-S5, 18.4R3-S8, 19.1R3-S6, 19.2R1-S7, 19.2R3-S2, 19.3R2-S6, 19.3R3-S3, 19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R3-S1, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1, and all subsequent releases.\n\nNote: Only those releases listed in the PROBLEM section above are affected.  This fix has also been proactively committed into other releases that are not vulnerable to this issue."}],"source":{"advisory":"JSA11216","defect":["1577814"],"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":"2021-10-13T16:00:00.000Z","ID":"CVE-2021-31351","STATE":"PUBLIC","TITLE":"Junos OS: MX Series: Receipt of specific packet on MS-MPC/MS-MIC causes line card reset"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Junos OS","version":{"version_data":[{"version_affected":"!<","version_value":"15.1"},{"version_affected":"!<","version_name":"17.3","version_value":"17.3R3-S11"},{"platform":"MX Series","version_affected":"=","version_value":"17.3R3-S11"},{"platform":"MX Series","version_affected":">=","version_name":"17.4","version_value":"17.4R2-S13"},{"version_affected":"!>=","version_name":"17.4","version_value":"17.4R3"},{"platform":"MX Series","version_affected":"=","version_value":"18.1R3-S12"},{"platform":"MX Series","version_affected":">=","version_name":"18.2","version_value":"18.2R2-S8, 18.2R3-S7"},{"platform":"MX Series","version_affected":"=","version_value":"18.3R3-S4"},{"platform":"MX Series","version_affected":">=","version_name":"18.4","version_value":"18.4R1-S8, 18.4R2-S7"},{"platform":"MX Series","version_affected":"=","version_name":"18.4","version_value":"18.4R3-S7"},{"platform":"MX Series","version_affected":"=","version_name":"19.1","version_value":"19.1R3-S4, 19.1R3-S5"},{"platform":"MX Series","version_affected":"=","version_name":"19.2","version_value":"19.2R1-S6"},{"platform":"MX Series","version_affected":"=","version_name":"19.3","version_value":"19.3R3-S2"},{"platform":"MX Series","version_affected":">=","version_name":"19.4","version_value":"19.4R2-S4"},{"platform":"MX Series","version_affected":"=","version_name":"19.4","version_value":"19.4R3-S2"},{"platform":"MX Series","version_affected":"=","version_name":"20.1","version_value":"20.1R2-S1"},{"platform":"MX Series","version_affected":">=","version_name":"20.2","version_value":"20.2R2-S2"},{"platform":"MX Series","version_affected":"=","version_name":"20.2","version_value":"20.2R3"},{"platform":"MX Series","version_affected":">=","version_name":"20.3","version_value":"20.3R1-S2"},{"platform":"MX Series","version_affected":"=","version_name":"20.3","version_value":"20.3R2"},{"platform":"MX Series","version_affected":"<","version_name":"20.4","version_value":"20.4R2-S1, 20.4R3"},{"platform":"MX Series","version_affected":"<","version_name":"21.1","version_value":"21.1R1-S1, 21.1R2"}]}}]},"vendor_name":"Juniper Networks"}]}},"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 packet processing on the MS-MPC/MS-MIC utilized by Juniper Networks Junos OS allows a malicious attacker to send a specific packet, triggering the MS-MPC/MS-MIC to reset, causing a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue only affects specific versions of Juniper Networks Junos OS on MX Series: 17.3R3-S11; 17.4R2-S13; 17.4R3 prior to 17.4R3-S5; 18.1R3-S12; 18.2R2-S8, 18.2R3-S7, 18.2R3-S8; 18.3R3-S4; 18.4R3-S7; 19.1R3-S4, 19.1R3-S5; 19.2R1-S6; 19.3R3-S2; 19.4R2-S4, 19.4R2-S5; 19.4R3-S2; 20.1R2-S1; 20.2R2-S2, 20.2R2-S3, 20.2R3; 20.3R2, 20.3R2-S1; 20.4R1, 20.4R1-S1, 20.4R2; 21.1R1; This issue does not affect any version of Juniper Networks Junos OS prior to 15.1X49-D240;"}]},"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":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-754 Improper Check for Unusual or Exceptional Conditions"}]},{"description":[{"lang":"eng","value":"Denial of Service (DoS)"}]}]},"references":{"reference_data":[{"name":"https://kb.juniper.net/JSA11216","refsource":"CONFIRM","url":"https://kb.juniper.net/JSA11216"}]},"solution":[{"lang":"en","value":"The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.3R3-S5, 18.4R3-S8, 19.1R3-S6, 19.2R1-S7, 19.2R3-S2, 19.3R2-S6, 19.3R3-S3, 19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R3-S1, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1, and all subsequent releases.\n\nNote: Only those releases listed in the PROBLEM section above are affected.  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