CVE-2025-21591

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condition.\n\nContinuous receipt of these DHCP packets using the malformed DHCP Option will create a sustained Denial of Service (DoS) condition.\n\n\nThis issue affects Junos OS:\n\n\n\n * from 23.1 before 23.2R2-S3,\n * from 23.4 before 23.4R2-S3,\n * from 24.2 before 24.2R2.\n\n\nThis issue isn't applicable to any versions of Junos OS before 23.1R1. \n\n\n\nThis issue doesn't affect vSRX Series which doesn't support DHCP Snooping. \n\nThis issue doesn't affect Junos OS Evolved.\n\nThere are no indicators of compromise for this issue.", "supportingMedia": [{"type": "text/html", "value": "A Buffer Access with Incorrect Length Value vulnerability in the jdhcpd daemon of Juniper Networks Junos OS, when DHCP snooping is enabled, allows an unauthenticated, adjacent, attacker to send a DHCP packet with a malformed DHCP option to cause jdhcp to crash creating a Denial of Service (DoS) condition.<br><br>Continuous receipt of these DHCP packets using the malformed DHCP Option will create a 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "modules": ["dhcp"], "packageName": "jdhcpd", "product": "Junos OS", "vendor": "Juniper Networks", "versions": [{"lessThan": "23.2R2-S3", "status": "affected", "version": "23.1", "versionType": "semver"}, {"lessThan": "23.4R2-S3", "status": "affected", "version": "23.4", "versionType": "semver"}, {"lessThan": "24.2R2", "status": "affected", "version": "24.2", "versionType": "semver"}, {"lessThanOrEqual": "23.1R1", "status": "unaffected", "version": "0", "versionType": "semver"}]}], "source": "sirt@juniper.net"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:juniper:junos:23.1:r1:*:*:*:*:*:*", "matchCriteriaId": "0038F142-6F5E-476D-A1EC-E977FD30F155", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:23.2:-:*:*:*:*:*:*", "matchCriteriaId": "1A78CC80-E8B1-4CDA-BB35-A61833657FA7", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:23.2:r1:*:*:*:*:*:*", "matchCriteriaId": "4B3B2FE1-C228-46BE-AC76-70C2687050AE", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:23.2:r1-s1:*:*:*:*:*:*", "matchCriteriaId": "F1B16FF0-900F-4AEE-B670-A537139F6909", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:23.2:r1-s2:*:*:*:*:*:*", "matchCriteriaId": "B227E831-30FF-4BE1-B8B2-31829A5610A6", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:23.2:r2:*:*:*:*:*:*", "matchCriteriaId": "1ADA814B-EF98-45B1-AF7A-0C89688F7CA5", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:23.2:r2-s1:*:*:*:*:*:*", "matchCriteriaId": "A6FB32DF-D062-4FB9-8777-452978BEC7B7", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:23.2:r2-s2:*:*:*:*:*:*", "matchCriteriaId": "B3B6C811-5C10-4486-849D-5559B592350A", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:23.4:-:*:*:*:*:*:*", "matchCriteriaId": "78481ABC-3620-410D-BC78-334657E0BB75", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:23.4:r1:*:*:*:*:*:*", "matchCriteriaId": "BE8A5BA3-87BD-473A-B229-2AAB2C797005", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:23.4:r1-s1:*:*:*:*:*:*", "matchCriteriaId": "8B74AC3E-8FC9-400A-A176-4F7F21F10756", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:23.4:r1-s2:*:*:*:*:*:*", "matchCriteriaId": "CB2D1FCE-8019-4CE1-BA45-D62F91AF7B51", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:23.4:r2:*:*:*:*:*:*", "matchCriteriaId": "175CCB13-76C0-44A4-A71D-41E22B92EB23", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:23.4:r2-s1:*:*:*:*:*:*", "matchCriteriaId": "166BFDB3-1945-4949-BC2B-E18442FF2E4D", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:23.4:r2-s2:*:*:*:*:*:*", "matchCriteriaId": "5923610F-878C-48CA-8B5D-9C609E4DD4DB", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:24.2:-:*:*:*:*:*:*", "matchCriteriaId": "89524D6D-0B22-4952-AD8E-8072C5A05D5C", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:24.2:r1:*:*:*:*:*:*", "matchCriteriaId": "AD69A194-1B03-44EA-8092-79BD10C6F729", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:24.2:r1-s1:*:*:*:*:*:*", "matchCriteriaId": "8463ADB4-B8A7-4D63-97A9-232ED713A21C", "vulnerable": true}, {"criteria": "cpe:2.3:o:juniper:junos:24.2:r1-s2:*:*:*:*:*:*", "matchCriteriaId": "FE68337F-106E-4317-A5B6-292B0159F577", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A Buffer Access with Incorrect Length Value vulnerability in the jdhcpd daemon of Juniper Networks Junos OS, when DHCP snooping is enabled, allows an unauthenticated, adjacent, attacker to send a DHCP packet with a malformed DHCP option to cause jdhcp to crash creating a Denial of Service (DoS) condition.\n\nContinuous receipt of these DHCP packets using the malformed DHCP Option will create a sustained Denial of Service (DoS) condition.\n\n\nThis issue affects Junos OS:\n\n\n\n * from 23.1 before 23.2R2-S3,\n * from 23.4 before 23.4R2-S3,\n * from 24.2 before 24.2R2.\n\n\nThis issue isn't applicable to any versions of Junos OS before 23.1R1. \n\n\n\nThis issue doesn't affect vSRX Series which doesn't support DHCP Snooping. \n\nThis issue doesn't affect Junos OS Evolved.\n\nThere are no indicators of compromise for this issue."}, {"lang": "es", "value": "Una vulnerabilidad de acceso al b\u00fafer con valor de longitud incorrecto en el demonio jdhcpd de Juniper Networks Junos OS, cuando la vigilancia DHCP est\u00e1 habilitada, permite que un atacante adyacente no autenticado env\u00ede un paquete DHCP con una opci\u00f3n DHCP mal formada para provocar el bloqueo de jdhcp, creando una condici\u00f3n de denegaci\u00f3n de servicio (DoS). La recepci\u00f3n continua de estos paquetes DHCP mediante la opci\u00f3n DHCP mal formada crear\u00e1 una condici\u00f3n de denegaci\u00f3n de servicio (DoS) sostenida. Este problema afecta a Junos OS: * de 23.1R1 a 23.2R2-S3, * de 23.4 a 23.4R2-S3, * de 24.2 a 24.2R2. Este problema no afecta a ninguna versi\u00f3n de Junos OS anterior a 23.1R1. Este problema no afecta a la serie vSRX, que no admite la vigilancia DHCP. Este problema no afecta a Junos OS Evolved. No hay indicadores de compromiso para este problema."}], "id": "CVE-2025-21591", "lastModified": "2026-06-17T08:43:48.003", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.8, "impactScore": 4.0, "source": "sirt@juniper.net", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "YES", "Recovery": "USER", "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": "GREEN", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "CONCENTRATED", "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:U/V:C/RE:M/U:Green", "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-2025-21591", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-04-10T13:17:33.869610Z", "version": "2.0.3"}}]}, "published": "2025-04-09T20:15:25.363", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://supportportal.juniper.net/JSA96448"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-805"}], "source": "sirt@juniper.net", "type": "Secondary"}]}

{}

{"created": "2025-07-13T11:07:17.738931+00:00", "updated": "2025-07-13T11:07:17.739006+00:00", "vendors": ["juniper_networks", "juniper_networks$PRODUCT$junos_os"]}