CVE-2026-33780

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Due to a logic issue in the l2ald memory management, memory allocated for these routes is not released when there is churn for these routes. As a result, memory leaks in the l2ald process which will ultimately lead to a crash and restart of l2ald.<br><br>Use the following command to monitor the memory consumption by l2ald:<br><br><tt>user@device&gt; show system process extensive | match \"PID|l2ald\"</tt> \n\n<br><br><p>This issue affects:</p><p>Junos OS:</p><p></p><ul><li>all versions before 22.4R3-S5,</li><li>23.2 versions before 23.2R2-S3,</li><li>23.4 versions before 23.4R2-S4,</li><li>24.2 versions before 24.2R2;</li></ul><p></p><p>Junos OS Evolved:</p><p></p><ul><li>all versions before 22.4R3-S5-EVO,</li><li>23.2 versions before 23.2R2-S3-EVO,</li><li>23.4 versions before 23.4R2-S4-EVO,</li><li>24.2 versions before 24.2R2-EVO.</li></ul><p></p><p><br></p>"}], "value": "A Missing Release of Memory after Effective Lifetime vulnerability in the\u00a0Layer 2 Address Learning Daemon (l2ald) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to cause a memory leak ultimately leading to a Denial of Service (DoS).\n\n\n\nIn an EVPN-MPLS scenario, routes learned from remote multi-homed Provider Edge (PE) devices are programmed as ESI routes. Due to a logic issue in the l2ald memory management, memory allocated for these routes is not released when there is churn for these routes. 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Due to a logic issue in the l2ald memory management, memory allocated for these routes is not released when there is churn for these routes. As a result, memory leaks in the l2ald process which will ultimately lead to a crash and restart of l2ald.\n\nUse the following command to monitor the memory consumption by l2ald:\n\nuser@device> show system process extensive | match \"PID|l2ald\" \n\n\n\nThis issue affects:\n\nJunos OS:\n\n\n\n * all versions before 22.4R3-S5,\n * 23.2 versions before 23.2R2-S3,\n * 23.4 versions before 23.4R2-S4,\n * 24.2 versions before 24.2R2;\n\n\n\n\nJunos OS Evolved:\n\n\n\n * all versions before 22.4R3-S5-EVO,\n * 23.2 versions before 23.2R2-S3-EVO,\n * 23.4 versions before 23.4R2-S4-EVO,\n * 24.2 versions before 24.2R2-EVO.", "supportingMedia": [{"type": "text/html", "value": "A Missing Release of Memory after Effective Lifetime vulnerability in the&nbsp;Layer 2 Address Learning Daemon (l2ald) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to cause a memory leak ultimately leading to a Denial of Service (DoS).<br><br>\n\nIn an EVPN-MPLS scenario, routes learned from remote multi-homed Provider Edge (PE) devices are programmed as ESI routes. Due to a logic issue in the l2ald memory management, memory allocated for these routes is not released when there is churn for these routes. As a result, memory leaks in the l2ald process which will ultimately lead to a crash and restart of l2ald.<br><br>Use the following command to monitor the memory consumption by l2ald:<br><br><tt>user@device&gt; show system process extensive | match \"PID|l2ald\"</tt> \n\n<br><br><p>This issue affects:</p><p>Junos OS:</p><p></p><ul><li>all versions before 22.4R3-S5,</li><li>23.2 versions before 23.2R2-S3,</li><li>23.4 versions before 23.4R2-S4,</li><li>24.2 versions before 24.2R2;</li></ul><p></p><p>Junos OS Evolved:</p><p></p><ul><li>all versions before 22.4R3-S5-EVO,</li><li>23.2 versions before 23.2R2-S3-EVO,</li><li>23.4 versions before 23.4R2-S4-EVO,</li><li>24.2 versions before 24.2R2-EVO.</li></ul><p></p><p><br></p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-401", "description": "CWE-401 Missing Release of Memory after Effective Lifetime"}]}], "configurations": [{"lang": "en", "value": "To be exposed to this issue the device must be configured for EVPN-MPLS. 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EVPN-MPLS scenario, routes learned from remote multi-homed Provider Edge (PE) devices are programmed as ESI routes. Due to a logic issue in the l2ald memory management, memory allocated for these routes is not released when there is churn for these routes. As a result, memory leaks in the l2ald process which will ultimately lead to a crash and restart of l2ald.\n\nUse the following command to monitor the memory consumption by l2ald:\n\nuser@device> show system process extensive | match \"PID|l2ald\" \n\n\n\nThis issue affects:\n\nJunos OS:\n\n\n\n * all versions before 22.4R3-S5,\n * 23.2 versions before 23.2R2-S3,\n * 23.4 versions before 23.4R2-S4,\n * 24.2 versions before 24.2R2;\n\n\n\n\nJunos OS Evolved:\n\n\n\n * all versions before 22.4R3-S5-EVO,\n * 23.2 versions before 23.2R2-S3-EVO,\n * 23.4 versions before 23.4R2-S4-EVO,\n * 24.2 versions before 24.2R2-EVO."}, {"lang": "es", "value": "Una vulnerabilidad de liberaci\u00f3n de memoria faltante despu\u00e9s de la vida \u00fatil efectiva en el demonio de aprendizaje de direcciones de capa 2 (l2ald) de Juniper Networks Junos OS y Junos OS Evolved permite a un atacante adyacente y no autenticado causar una fuga de memoria que finalmente conduce a una denegaci\u00f3n de servicio (DoS).\n\nEn un escenario EVPN-MPLS, las rutas aprendidas de dispositivos de borde de proveedor (PE) multi-homed remotos se programan como rutas ESI. Debido a un problema de l\u00f3gica en la gesti\u00f3n de memoria de l2ald, la memoria asignada para estas rutas no se libera cuando hay cambios frecuentes para estas rutas. Como resultado, se producen fugas de memoria en el proceso l2ald, lo que finalmente conducir\u00e1 a un fallo y reinicio de l2ald.\n\nUtilice el siguiente comando para monitorear el consumo de memoria por l2ald:\n\nuser@device> show system process extensive | match \u201cPID|l2ald\u201d\n\nEste problema afecta:\n\nJunos OS:\n\n * todas las versiones anteriores a 22.4R3-S5,\n * versiones 23.2 anteriores a 23.2R2-S3,\n * versiones 23.4 anteriores a 23.4R2-S4,\n * versiones 24.2 anteriores a 24.2R2;\n\nJunos OS Evolved:\n\n * todas las versiones anteriores a 22.4R3-S5-EVO,\n * versiones 23.2 anteriores a 23.2R2-S3-EVO,\n * versiones 23.4 anteriores a 23.4R2-S4-EVO,\n * versiones 24.2 anteriores a 24.2R2-EVO."}], "id": "CVE-2026-33780", "lastModified": "2026-10-26T22:10:00.163", "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"}], "cvssMetricV40": [{"cvssData": {"Automatable": "YES", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "ADJACENT", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:M/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "MODERATE"}, "source": "sirt@juniper.net", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33780", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-13T17:39:43.706961Z", "version": "2.0.3"}}]}, "published": "2026-04-09T22:16:26.960", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA107819"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "sirt@juniper.net", "type": "Secondary"}]}

{}

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