{"id":"CVE-2021-0237","state":"PUBLISHED","title":"Junos OS: EX4300-MP/EX4600/EX4650/QFX5K Series: Packet Forwarding Engine manager (FXPC) process crashes when deployed in a Virtual Chassis (VC) configuration","description":"On Juniper Networks EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series deployed as a Virtual Chassis with a specific Layer 2 circuit configuration, Packet Forwarding Engine manager (FXPC) process may crash and restart upon receipt of specific layer 2 frames. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS on EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series 15.1 versions prior to 15.1R7-S9; 17.3 versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R2-S13, 17.4R3-S4, 17.4R3-S5; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R2-S7, 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R2-S4, 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2, 20.2R3; 20.3 versions prior to 20.3R1-S2, 20.3R2;","publishedAt":"2021-04-22T19:37:04.064Z","updatedAt":"2024-09-17T02:56:55.241Z","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":"15.1","status":"affected","lessThan":"15.1R7-S9","versionType":"custom"},{"version":"17.3","status":"affected","lessThan":"17.3R3-S11","versionType":"custom"},{"version":"17.4","status":"affected","lessThan":"17.4R2-S13, 17.4R3-S4, 17.4R3-S5","versionType":"custom"},{"version":"18.2","status":"affected","lessThan":"18.2R3-S8","versionType":"custom"},{"version":"18.3","status":"affected","lessThan":"18.3R3-S4","versionType":"custom"},{"version":"18.4","status":"affected","lessThan":"18.4R2-S7, 18.4R3-S6","versionType":"custom"},{"version":"19.1","status":"affected","lessThan":"19.1R3-S4","versionType":"custom"},{"version":"19.2","status":"affected","lessThan":"19.2R1-S6, 19.2R3-S1","versionType":"custom"},{"version":"19.3","status":"affected","lessThan":"19.3R3-S1","versionType":"custom"},{"version":"19.4","status":"affected","lessThan":"19.4R2-S4, 19.4R3-S1","versionType":"custom"},{"version":"20.1","status":"affected","lessThan":"20.1R2","versionType":"custom"},{"version":"20.2","status":"affected","lessThan":"20.2R2, 20.2R3","versionType":"custom"},{"version":"20.3","status":"affected","lessThan":"20.3R1-S2, 20.3R2","versionType":"custom"}],"platforms":["EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series"]}],"references":["https://kb.juniper.net/JSA11132"],"weaknesses":[],"ingestedAt":"2026-10-29T19:47:50.134Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/0xxx/CVE-2021-0237.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-0237","state":"PUBLISHED","datePublished":"2021-04-22T19:37:04.064Z","dateUpdated":"2024-09-17T02:56:55.241Z","assignerShortName":"juniper","assignerOrgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","dateReserved":"2020-10-27T00:00:00.000Z"},"containers":{"cna":{"title":"Junos OS: EX4300-MP/EX4600/EX4650/QFX5K Series: Packet Forwarding Engine manager (FXPC) process crashes when deployed in a Virtual Chassis (VC) configuration","descriptions":[{"lang":"en","value":"On Juniper Networks EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series deployed as a Virtual Chassis with a specific Layer 2 circuit configuration, Packet Forwarding Engine manager (FXPC) process may crash and restart upon receipt of specific layer 2 frames. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS on EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series 15.1 versions prior to 15.1R7-S9; 17.3 versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R2-S13, 17.4R3-S4, 17.4R3-S5; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R2-S7, 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R2-S4, 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2, 20.2R3; 20.3 versions prior to 20.3R1-S2, 20.3R2;"}],"affected":[{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"15.1","status":"affected","lessThan":"15.1R7-S9","versionType":"custom"},{"version":"17.3","status":"affected","lessThan":"17.3R3-S11","versionType":"custom"},{"version":"17.4","status":"affected","lessThan":"17.4R2-S13, 17.4R3-S4, 17.4R3-S5","versionType":"custom"},{"version":"18.2","status":"affected","lessThan":"18.2R3-S8","versionType":"custom"},{"version":"18.3","status":"affected","lessThan":"18.3R3-S4","versionType":"custom"},{"version":"18.4","status":"affected","lessThan":"18.4R2-S7, 18.4R3-S6","versionType":"custom"},{"version":"19.1","status":"affected","lessThan":"19.1R3-S4","versionType":"custom"},{"version":"19.2","status":"affected","lessThan":"19.2R1-S6, 19.2R3-S1","versionType":"custom"},{"version":"19.3","status":"affected","lessThan":"19.3R3-S1","versionType":"custom"},{"version":"19.4","status":"affected","lessThan":"19.4R2-S4, 19.4R3-S1","versionType":"custom"},{"version":"20.1","status":"affected","lessThan":"20.1R2","versionType":"custom"},{"version":"20.2","status":"affected","lessThan":"20.2R2, 20.2R3","versionType":"custom"},{"version":"20.3","status":"affected","lessThan":"20.3R1-S2, 20.3R2","versionType":"custom"}],"platforms":["EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series"]}],"references":[{"url":"https://kb.juniper.net/JSA11132","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":[{"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":"2021-04-22T19:37:03.000Z","orgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968"},"configurations":[{"lang":"en","value":"The examples of the configuration stanza affected by this issue is as follows:\n\n  [protocols l2circuit neighbor <address> interface <interface-name>]\n\nused together with\n  [protocols mpls interface <interface-name>]\nor\n  [protocols ospf area <area-id> interface <interface-name>]"}],"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: 15.1R7-S9, 17.3R3-S11, 17.4R2-S13, 17.4R3-S4, 17.4R3-S5, 18.3R3-S4, 18.4R2-S7, 18.4R3-S6, 19.1R3-S4, 19.2R1-S6, 19.2R3-S1, 19.3R3-S1, 19.4R2-S4, 19.4R3-S1, 20.1R2, 20.2R2, 20.2R3, 20.3R1-S2, 20.3R2, 20.4R1, and all subsequent releases."}],"source":{"advisory":"JSA11132","defect":["1528409"],"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-2021-0237","STATE":"PUBLIC","TITLE":"Junos OS: EX4300-MP/EX4600/EX4650/QFX5K Series: Packet Forwarding Engine manager (FXPC) process crashes when deployed in a Virtual Chassis (VC) configuration"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Junos OS","version":{"version_data":[{"platform":"EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series","version_affected":"<","version_name":"15.1","version_value":"15.1R7-S9"},{"platform":"EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series","version_affected":"<","version_name":"17.3","version_value":"17.3R3-S11"},{"platform":"EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series","version_affected":"<","version_name":"17.4","version_value":"17.4R2-S13, 17.4R3-S4, 17.4R3-S5"},{"platform":"EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series","version_affected":"<","version_name":"18.2","version_value":"18.2R3-S8"},{"platform":"EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series","version_affected":"<","version_name":"18.3","version_value":"18.3R3-S4"},{"platform":"EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series","version_affected":"<","version_name":"18.4","version_value":"18.4R2-S7, 18.4R3-S6"},{"platform":"EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series","version_affected":"<","version_name":"19.1","version_value":"19.1R3-S4"},{"platform":"EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series","version_affected":"<","version_name":"19.2","version_value":"19.2R1-S6, 19.2R3-S1"},{"platform":"EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series","version_affected":"<","version_name":"19.3","version_value":"19.3R3-S1"},{"platform":"EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series","version_affected":"<","version_name":"19.4","version_value":"19.4R2-S4, 19.4R3-S1"},{"platform":"EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series","version_affected":"<","version_name":"20.1","version_value":"20.1R2"},{"platform":"EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series","version_affected":"<","version_name":"20.2","version_value":"20.2R2, 20.2R3"},{"platform":"EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series","version_affected":"<","version_name":"20.3","version_value":"20.3R1-S2, 20.3R2"}]}}]},"vendor_name":"Juniper Networks"}]}},"configuration":[{"lang":"en","value":"The examples of the configuration stanza affected by this issue is as follows:\n\n  [protocols l2circuit neighbor <address> interface <interface-name>]\n\nused together with\n  [protocols mpls interface <interface-name>]\nor\n  [protocols ospf area <area-id> interface <interface-name>]"}],"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"On Juniper Networks EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series deployed as a Virtual Chassis with a specific Layer 2 circuit configuration, Packet Forwarding Engine manager (FXPC) process may crash and restart upon receipt of specific layer 2 frames. Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS on EX4300-MP Series, EX4600 Series, EX4650 Series, QFX5K Series 15.1 versions prior to 15.1R7-S9; 17.3 versions prior to 17.3R3-S11; 17.4 versions prior to 17.4R2-S13, 17.4R3-S4, 17.4R3-S5; 18.2 versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R2-S7, 18.4R3-S6; 19.1 versions prior to 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versions prior to 19.4R2-S4, 19.4R3-S1; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R2, 20.2R3; 20.3 versions prior to 20.3R1-S2, 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":"754 - Improper Check for Unusual or Exceptional Conditions"}]},{"description":[{"lang":"eng","value":"Denial of Service (DoS)"}]}]},"references":{"reference_data":[{"name":"https://kb.juniper.net/JSA11132","refsource":"MISC","url":"https://kb.juniper.net/JSA11132"}]},"solution":[{"lang":"en","value":"The following software releases have been updated to resolve this specific issue: 15.1R7-S9, 17.3R3-S11, 17.4R2-S13, 17.4R3-S4, 17.4R3-S5, 18.3R3-S4, 18.4R2-S7, 18.4R3-S6, 19.1R3-S4, 19.2R1-S6, 19.2R3-S1, 19.3R3-S1, 19.4R2-S4, 19.4R3-S1, 20.1R2, 20.2R2, 20.2R3, 20.3R1-S2, 20.3R2, 20.4R1, and all subsequent releases."}],"source":{"advisory":"JSA11132","defect":["1528409"],"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/JSA11132","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T15:32:10.280Z"}}]}}}