CVE-2023-36849

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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. 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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"}], "id": "CVE-2023-36849", "lastModified": "2026-06-17T06:07:13.617", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "sirt@juniper.net", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-36849", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-22T14:05:41.292138Z", "version": "2.0.3"}}]}, "published": "2023-07-14T18:15:10.503", "references": [{"source": "sirt@juniper.net", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://supportportal.juniper.net/JSA71660"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mitigation", "Vendor Advisory"], "url": "https://supportportal.juniper.net/JSA71660"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-703"}], "source": "sirt@juniper.net", "type": "Secondary"}]}

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