{"id":"CVE-2021-0267","state":"PUBLISHED","title":"Junos OS: Receipt of a crafted DHCP packet will cause the jdhcpd DHCP service to core.","description":"An Improper Input Validation vulnerability in the active-lease query portion in JDHCPD's DHCP Relay Agent of Juniper Networks Junos OS allows an attacker to cause a Denial of Service (DoS) by sending a crafted DHCP packet to the device thereby crashing the jdhcpd DHCP service. This is typically configured for Broadband Subscriber Sessions. Continued receipt and processing of this crafted packet will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS: 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R2. This issue does not affect Junos OS Evolved.","publishedAt":"2021-04-22T19:37:24.295Z","updatedAt":"2024-09-17T03:54:44.443Z","severity":{"score":7.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","source":"juniper"},"assigner":"juniper","products":["Juniper Networks Junos OS"],"affected":[{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"19.4","status":"affected","lessThan":"19.4R3-S1","versionType":"custom"},{"version":"20.1","status":"affected","lessThan":"20.1R2-S1, 20.1R3","versionType":"custom"},{"version":"20.2","status":"affected","lessThan":"20.2R3","versionType":"custom"},{"version":"20.3","status":"affected","lessThan":"20.3R2","versionType":"custom"}]}],"references":["https://kb.juniper.net/JSA11158","https://www.juniper.net/documentation/us/en/software/junos/subscriber-mgmt-sessions/topics/ref/statement/active-leasequery-edit-forwarding-options.html"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-29T19:47:50.134Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/0xxx/CVE-2021-0267.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-0267","state":"PUBLISHED","datePublished":"2021-04-22T19:37:24.295Z","dateUpdated":"2024-09-17T03:54:44.443Z","assignerShortName":"juniper","assignerOrgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","dateReserved":"2020-10-27T00:00:00.000Z"},"containers":{"cna":{"title":"Junos OS: Receipt of a crafted DHCP packet will cause the jdhcpd DHCP service to core.","descriptions":[{"lang":"en","value":"An Improper Input Validation vulnerability in the active-lease query portion in JDHCPD's DHCP Relay Agent of Juniper Networks Junos OS allows an attacker to cause a Denial of Service (DoS) by sending a crafted DHCP packet to the device thereby crashing the jdhcpd DHCP service. This is typically configured for Broadband Subscriber Sessions. Continued receipt and processing of this crafted packet will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS: 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R2. This issue does not affect Junos OS Evolved."}],"affected":[{"vendor":"Juniper Networks","product":"Junos OS","versions":[{"version":"19.4","status":"affected","lessThan":"19.4R3-S1","versionType":"custom"},{"version":"20.1","status":"affected","lessThan":"20.1R2-S1, 20.1R3","versionType":"custom"},{"version":"20.2","status":"affected","lessThan":"20.2R3","versionType":"custom"},{"version":"20.3","status":"affected","lessThan":"20.3R2","versionType":"custom"}]}],"references":[{"url":"https://kb.juniper.net/JSA11158","tags":["x_refsource_MISC"]},{"url":"https://www.juniper.net/documentation/us/en/software/junos/subscriber-mgmt-sessions/topics/ref/statement/active-leasequery-edit-forwarding-options.html","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"HIGH","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","description":"CWE-20 Improper Input Validation","lang":"en","type":"CWE"}]},{"descriptions":[{"description":"Denial of Service (DoS)","lang":"en","type":"text"}]}],"providerMetadata":{"shortName":"juniper","dateUpdated":"2021-04-22T19:37:24.000Z","orgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968"},"configurations":[{"lang":"en","value":"This issue requires active-lease query with none or greater optional settings to be configured in one or more hierarchy locations.\n\n  active-leasequery {\n    idle-timeout \"seconds\"; (optional)\n    peer-address \"address\"; (optional)\n    timeout \"seconds\"; (optional)\n    topology-discover; (optional)\n  }\n\nwith\n\n  [forwarding-options dhcp-relay],\n  [forwarding-options dhcp-relay dhcpv6],\n  [logical-systems logical-system-name ...],\n  [logical-systems logical-system-name routing-instances routing-instance-name ...],\n  [routing-instances routing-instance-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: \nJunos OS: 19.4R3-S1, 20.1R2-S1, 20.1R3, 20.2R3, 20.3R2, 20.4R1, and all subsequent releases."}],"source":{"advisory":"JSA11158","defect":["1534814"],"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-2021-0267","STATE":"PUBLIC","TITLE":"Junos OS: Receipt of a crafted DHCP packet will cause the jdhcpd DHCP service to core."},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"Junos OS","version":{"version_data":[{"version_affected":"<","version_name":"19.4","version_value":"19.4R3-S1"},{"version_affected":"<","version_name":"20.1","version_value":"20.1R2-S1, 20.1R3"},{"version_affected":"<","version_name":"20.2","version_value":"20.2R3"},{"version_affected":"<","version_name":"20.3","version_value":"20.3R2"}]}}]},"vendor_name":"Juniper Networks"}]}},"configuration":[{"lang":"en","value":"This issue requires active-lease query with none or greater optional settings to be configured in one or more hierarchy locations.\n\n  active-leasequery {\n    idle-timeout \"seconds\"; (optional)\n    peer-address \"address\"; (optional)\n    timeout \"seconds\"; (optional)\n    topology-discover; (optional)\n  }\n\nwith\n\n  [forwarding-options dhcp-relay],\n  [forwarding-options dhcp-relay dhcpv6],\n  [logical-systems logical-system-name ...],\n  [logical-systems logical-system-name routing-instances routing-instance-name ...],\n  [routing-instances routing-instance-name ...]"}],"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"An Improper Input Validation vulnerability in the active-lease query portion in JDHCPD's DHCP Relay Agent of Juniper Networks Junos OS allows an attacker to cause a Denial of Service (DoS) by sending a crafted DHCP packet to the device thereby crashing the jdhcpd DHCP service. This is typically configured for Broadband Subscriber Sessions. Continued receipt and processing of this crafted packet will create a sustained Denial of Service (DoS) condition. This issue affects Juniper Networks Junos OS: 19.4 versions prior to 19.4R3-S1; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R2. This issue does not affect Junos OS Evolved."}]},"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":7.4,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-20 Improper Input Validation"}]},{"description":[{"lang":"eng","value":"Denial of Service (DoS)"}]}]},"references":{"reference_data":[{"name":"https://kb.juniper.net/JSA11158","refsource":"MISC","url":"https://kb.juniper.net/JSA11158"},{"name":"https://www.juniper.net/documentation/us/en/software/junos/subscriber-mgmt-sessions/topics/ref/statement/active-leasequery-edit-forwarding-options.html","refsource":"MISC","url":"https://www.juniper.net/documentation/us/en/software/junos/subscriber-mgmt-sessions/topics/ref/statement/active-leasequery-edit-forwarding-options.html"}]},"solution":[{"lang":"en","value":"The following software releases have been updated to resolve this specific issue: \nJunos OS: 19.4R3-S1, 20.1R2-S1, 20.1R3, 20.2R3, 20.3R2, 20.4R1, and all subsequent releases."}],"source":{"advisory":"JSA11158","defect":["1534814"],"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/JSA11158","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://www.juniper.net/documentation/us/en/software/junos/subscriber-mgmt-sessions/topics/ref/statement/active-leasequery-edit-forwarding-options.html","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T15:32:10.508Z"}}]}}}