CVE-2026-33782

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When all available memory has been exhausted, jdhcpd will crash and restart which causes a complete service impact until the process has recovered.\n\nThe memory usage of jdhcpd can be monitored with:\n\nuser@host> show system processes extensive | match jdhcpd\n\n\n\nThis issue affects Junos OS:\n\n * all versions before 22.4R3-S1,\n * 23.2 versions before 23.2R2,\n * 23.4 versions before 23.4R2."}, {"lang": "es", "value": "Una vulnerabilidad de \u2019Missing Release of Memory after Effective Lifetime\u2019 en el demonio DHCP (jdhcpd) de Juniper Networks Junos OS en la serie MX, permite a un atacante adyacente y no autenticado causar una fuga de memoria, que eventualmente causar\u00e1 una denegaci\u00f3n de servicio (DoS) completa.\n\nEn un escenario de DHCPv6 sobre PPPoE, o DHCPv6 sobre VLAN con consulta de arrendamiento activa o consulta de arrendamiento masiva, cada cierre de sesi\u00f3n de suscriptor filtrar\u00e1 una peque\u00f1a cantidad de memoria. Cuando toda la memoria disponible se haya agotado, jdhcpd se bloquear\u00e1 y reiniciar\u00e1, lo que causa un impacto completo en el servicio hasta que el proceso se haya recuperado.\n\nEl uso de memoria de jdhcpd se puede monitorear con:\n\nuser@host> show system processes extensive | match jdhcpd\n\nEste problema afecta a Junos OS:\n\n * todas las versiones anteriores a 22.4R3-S1,\n * versiones 23.2 anteriores a 23.2R2,\n * versiones 23.4 anteriores a 23.4R2."}], "id": "CVE-2026-33782", "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": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.7, "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:N/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-2026-33782", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-13T17:39:56.482866Z", "version": "2.0.3"}}]}, "published": "2026-04-09T22:16:27.393", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA107820"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "sirt@juniper.net", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["mx_series"], "status": "affected", "versions": {"scheme": "generic", "value": "[0,22.4R3-S1)"}}, {"platform": ["mx_series"], "status": "affected", "versions": {"scheme": "generic", "value": "[23.2,23.2R2)"}}, {"platform": ["mx_series"], "status": "affected", "versions": {"scheme": "generic", "value": "[23.4,23.4R2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Junos OS", "source": "cna", "vendor": "Juniper Networks"}, "product": "junos_os", "vendor": "juniper_networks"}], "analysis": {"en": {"generated_at": "2026-04-09T22:20:55.655514+00:00", "value": {"mitigation_remediation": ["Upgrade Junos OS to a fixed release (22.4R3\u2011S1, 23.2R2, 23.4R2, 24.2R1, or later).", "If an urgent upgrade is not possible, monitor jdhcpd memory usage with \u2018show system processes extensive | match jdhcpd\u2019 to detect increasing trends.", "When memory usage appears to be escalating, restart the jdhcpd process or the device to temporarily restore service."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The flaw affects Junos OS on MX Series devices. All releases prior to 22.4R3\u2011S1, all 23.2 releases before 23.2R2, and all 23.4 releases before 23.4R2 are vulnerable. The documented scenarios involve DHCPv6 over PPPoE or DHCPv6 over VLAN with Active lease query or Bulk lease query.", "description_and_impact": "The vulnerability is a memory leak in the DHCP daemon jdhcpd on Juniper Networks Junos OS MX Series. Each subscriber logout during certain DHCPv6 scenarios leaves a small amount of memory unreleased, causing jdhcpd to consume more memory over time. When system memory is exhausted, jdhcpd crashes and restarts, resulting in a complete service outage for the junction that requires the process to recover. The weakness corresponds to CWE-401 (Memory Leak).", "risk_and_exploitability": "The CVSS score of 8.7 signals a high severity risk, and the description indicates that an unauthenticated attacker who is adjacent to the network can trigger the leak by causing subscriber logouts in the affected DHCPv6 contexts. The absence of an EPSS score limits precise exploitation probability, but the straightforward use of DHCP logs and lack of defense in depth suggest that exploitation is feasible once the conditions are met. The issue is not listed in the CISA KEV catalog, so it is not a currently known exploited vulnerability in the wild. The impact is a complete denial of service for the jdhcpd process and any higher\u2011level services that rely on it."}}}}, "created": "2026-04-10T08:37:06.192048+00:00", "updated": "2026-04-10T09:28:10.809314+00:00", "vendors": ["juniper_networks", "juniper_networks$PRODUCT$junos_os"]}