{"id":"CVE-2023-36849","state":"PUBLISHED","title":"Junos OS and Junos OS Evolved: The l2cpd will crash when a malformed LLDP packet is received","description":"An Improper Check or Handling of Exceptional Conditions vulnerability in the Layer-2 control protocols daemon (l2cpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a Denial of Service (DoS).\n\nWhen a malformed LLDP packet is received, l2cpd will crash and restart. The impact of the l2cpd crash is reinitialization of STP protocols (RSTP, MSTP or VSTP), and MVRP and ERP. Also, if any services depend on LLDP state (like PoE or VoIP device recognition), then these will also be affected. Continued receipt of such packets will lead to a sustained Denial of Service.\n\nThis issue affects:\nJuniper Networks Junos OS\n21.4 versions prior to 21.4R3-S3;\n22.1 versions prior to 22.1R3-S3;\n22.2 versions prior to 22.2R2-S1, 22.2R3;\n22.3 versions prior to 22.3R2.\n\nJuniper Networks Junos OS Evolved\n21.4-EVO versions prior to 21.4R3-S2-EVO;\n22.1-EVO versions prior to 22.1R3-S3-EVO;\n22.2-EVO versions prior to 22.2R2-S1-EVO, 22.2R3-EVO;\n22.3-EVO versions prior to 22.3R2-EVO.\n","publishedAt":"2023-07-14T17:58:25.911Z","updatedAt":"2024-10-22T14:18:47.090Z","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","Juniper Networks Junos OS Evolved"],"affected":[{"vendor":"Juniper Networks","product":"Junos OS","defaultStatus":"unaffected","versions":[{"version":"21.4","status":"affected","lessThan":"21.4R3-S3","versionType":"custom"},{"version":"22.1","status":"affected","lessThan":"22.1R3-S3","versionType":"custom"},{"version":"22.2","status":"affected","lessThan":"22.2R2-S1, 22.2R3","versionType":"custom"},{"version":"22.3","status":"affected","lessThan":"22.3R2","versionType":"custom"}]},{"vendor":"Juniper Networks","product":"Junos OS Evolved","defaultStatus":"unaffected","versions":[{"version":"21.4","status":"affected","lessThan":"21.4R3-S2-EVO","versionType":"custom"},{"version":"22.1","status":"affected","lessThan":"22.1R3-S3-EVO","versionType":"custom"},{"version":"22.2","status":"affected","lessThan":"22.2R2-S1-EVO, 22.2R3-EVO","versionType":"custom"},{"version":"22.3","status":"affected","lessThan":"22.3R2-EVO","versionType":"custom"}]}],"references":["https://supportportal.juniper.net/JSA71660"],"weaknesses":["CWE-703"],"ingestedAt":"2026-10-29T20:06:08.715Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/36xxx/CVE-2023-36849.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-36849","state":"PUBLISHED","datePublished":"2023-07-14T17:58:25.911Z","dateUpdated":"2024-10-22T14:18:47.090Z","assignerShortName":"juniper","assignerOrgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","dateReserved":"2023-06-27T16:17:25.277Z"},"containers":{"cna":{"title":"Junos OS and Junos OS Evolved: The l2cpd will crash when a malformed LLDP packet is received","descriptions":[{"lang":"en","value":"An Improper Check or Handling of Exceptional Conditions vulnerability in the Layer-2 control protocols daemon (l2cpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a Denial of Service (DoS).\n\nWhen a malformed LLDP packet is received, l2cpd will crash and restart. The impact of the l2cpd crash is reinitialization of STP protocols (RSTP, MSTP or VSTP), and MVRP and ERP. Also, if any services depend on LLDP state (like PoE or VoIP device recognition), then these will also be affected. Continued receipt of such packets will lead to a sustained Denial of Service.\n\nThis issue affects:\nJuniper Networks Junos OS\n21.4 versions prior to 21.4R3-S3;\n22.1 versions prior to 22.1R3-S3;\n22.2 versions prior to 22.2R2-S1, 22.2R3;\n22.3 versions prior to 22.3R2.\n\nJuniper Networks Junos OS Evolved\n21.4-EVO versions prior to 21.4R3-S2-EVO;\n22.1-EVO versions prior to 22.1R3-S3-EVO;\n22.2-EVO versions prior to 22.2R2-S1-EVO, 22.2R3-EVO;\n22.3-EVO versions prior to 22.3R2-EVO.\n"}],"affected":[{"vendor":"Juniper Networks","product":"Junos OS","defaultStatus":"unaffected","versions":[{"version":"21.4","status":"affected","lessThan":"21.4R3-S3","versionType":"custom"},{"version":"22.1","status":"affected","lessThan":"22.1R3-S3","versionType":"custom"},{"version":"22.2","status":"affected","lessThan":"22.2R2-S1, 22.2R3","versionType":"custom"},{"version":"22.3","status":"affected","lessThan":"22.3R2","versionType":"custom"}]},{"vendor":"Juniper Networks","product":"Junos OS Evolved","defaultStatus":"unaffected","versions":[{"version":"21.4","status":"affected","lessThan":"21.4R3-S2-EVO","versionType":"custom"},{"version":"22.1","status":"affected","lessThan":"22.1R3-S3-EVO","versionType":"custom"},{"version":"22.2","status":"affected","lessThan":"22.2R2-S1-EVO, 22.2R3-EVO","versionType":"custom"},{"version":"22.3","status":"affected","lessThan":"22.3R2-EVO","versionType":"custom"}]}],"references":[{"url":"https://supportportal.juniper.net/JSA71660"}],"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"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-703","description":"CWE-703 Improper Check or Handling of Exceptional Conditions","lang":"en","type":"CWE"}]},{"descriptions":[{"description":"Denial of Service (DoS)","lang":"en"}]}],"providerMetadata":{"shortName":"juniper","orgId":"8cbe9d5a-a066-4c94-8978-4b15efeae968","dateUpdated":"2023-07-14T17:58:25.911Z"},"configurations":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"This vulnerability is only exploitable on interfaces with LLDP enabled.<br><br><tt>&nbsp; [ protocols lldp interface &lt;interface&gt;]</tt>"}],"value":"This vulnerability is only exploitable on interfaces with LLDP enabled.\n\n  [ protocols lldp interface <interface>]"}],"datePublic":"2023-07-12T16:00:00.000Z","exploits":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Juniper SIRT is not aware of any malicious exploitation of this vulnerability.<br>"}],"value":"Juniper SIRT is not aware of any malicious exploitation of this vulnerability.\n"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"The following software releases have been updated to resolve this specific issue: <br>\n\n<span style=\"background-color: rgb(255, 255, 255);\">Junos OS: 21.4R3-S3, 22.1R3-S3, 22.2R2-S1, 22.2R3, 22.3R2, 22.4R1, and all subsequent releases.</span><br>\n\nJunos OS Evolved: 21.4R3-S2-EVO, 22.1R3-S3-EVO, 22.2R2-S1-EVO, 22.2R3-EVO, 22.3R2-EVO, 22.4R1-EVO, and all subsequent releases;<br><br>"}],"value":"The following software releases have been updated to resolve this specific issue: \n\n\nJunos OS: 21.4R3-S3, 22.1R3-S3, 22.2R2-S1, 22.2R3, 22.3R2, 22.4R1, and all subsequent releases.\n\n\nJunos OS Evolved: 21.4R3-S2-EVO, 22.1R3-S3-EVO, 22.2R2-S1-EVO, 22.2R3-EVO, 22.3R2-EVO, 22.4R1-EVO, and all subsequent releases;\n\n"}],"source":{"advisory":"JSA71660","defect":["1692022"],"discovery":"USER"},"workarounds":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"There are no available workarounds for this issue. <br><br>If LLDP and its services are not required, this issue can be mitigated by disabling LLDP.<br>"}],"value":"There are no available workarounds for this issue. \n\nIf LLDP and its services are not required, this issue can be mitigated by disabling LLDP.\n"}],"x_generator":{"engine":"Vulnogram 0.1.0-dev"}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://supportportal.juniper.net/JSA71660","tags":["x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-02T17:01:09.676Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2024-10-22T14:05:41.292138Z","id":"CVE-2023-36849","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2024-10-22T14:18:47.090Z"}}]}}}