CVE-2025-52951

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In essence, these firewall filter terms were being processed as an 'accept' for all traffic on the interface destined for the control plane, even when used in combination with other match criteria.<br><br>This issue only affects firewall filters protecting the device's control plane. Transit firewall filtering is unaffected by this vulnerability.<br><br><p>This issue affects Junos OS:&nbsp;</p><p></p><ul><li>all versions before 21.2R3-S9,&nbsp;</li><li>from 21.4 before 21.4R3-S11,&nbsp;</li><li>from 22.2 before 22.2R3-S7,&nbsp;</li><li>from 22.4 before 22.4R3-S7,&nbsp;</li><li>from 23.2 before 23.2R2-S4,&nbsp;</li><li>from 23.4 before 23.4R2-S5,&nbsp;</li><li>from 24.2 before 24.2R2-S1,&nbsp;</li><li>from 24.4 before 24.4R1-S2, 24.4R2.</li></ul><br>This is a more complete fix for previously published&nbsp;CVE-2024-21607 (JSA75748).<p></p>"}], "value": "A Protection Mechanism Failure vulnerability in kernel filter processing of Juniper Networks Junos OS allows an attacker sending IPv6 traffic destined to the device to effectively bypass any firewall filtering configured on the interface.\n\nDue to an issue with Junos OS kernel filter processing, the 'payload-protocol' match is not being supported, causing any term containing it\u00a0to accept all packets without taking any other action. In essence, these firewall filter terms were being processed as an 'accept' for all traffic on the interface destined for the control plane, even when used in combination with other match criteria.\n\nThis issue only affects firewall filters protecting the device's control plane. Transit firewall filtering is unaffected by this vulnerability.\n\nThis issue affects Junos OS:\u00a0\n\n\n\n * all versions before 21.2R3-S9,\u00a0\n * from 21.4 before 21.4R3-S11,\u00a0\n * from 22.2 before 22.2R3-S7,\u00a0\n * from 22.4 before 22.4R3-S7,\u00a0\n * from 23.2 before 23.2R2-S4,\u00a0\n * from 23.4 before 23.4R2-S5,\u00a0\n * from 24.2 before 24.2R2-S1,\u00a0\n * from 24.4 before 24.4R1-S2, 24.4R2.\n\n\n\nThis is a more complete fix for previously published\u00a0CVE-2024-21607 (JSA75748)."}], "exploits": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}], "value": "Juniper SIRT is not aware of any malicious exploitation of this vulnerability."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"cvssV4_0": {"Automatable": "YES", "Recovery": "USER", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 6.9, "baseSeverity": "MEDIUM", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/AU:Y/R:U/RE:M", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "MODERATE"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-693", "description": "CWE-693: Protection Mechanism Failure", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper", "dateUpdated": "2025-07-15T14:35:11.059Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://supportportal.juniper.net/JSA100055"}], "solutions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "The following software releases have been updated to resolve this specific issue: 21.2R3-S9, 21.4R3-S11, 22.2R3-S7, 22.4R3-S7, 23.2R2-S4, 23.4R2-S5, 24.2R2-S1, 24.4R1-S2, 24.4R2, 25.2R1, and all subsequent releases."}], "value": "The following software releases have been updated to resolve this specific issue: 21.2R3-S9, 21.4R3-S11, 22.2R3-S7, 22.4R3-S7, 23.2R2-S4, 23.4R2-S5, 24.2R2-S1, 24.4R1-S2, 24.4R2, 25.2R1, and all subsequent releases."}], "source": {"advisory": "JSA100055", "defect": ["1844796"], "discovery": "USER"}, "timeline": [{"lang": "en", "time": "2025-07-09T16:00:00.000Z", "value": "Initial Publication"}, {"lang": "en", "time": "2025-07-15T16:00:00.000Z", "value": "Clarified that only traffic destined to the control plane is affected"}], "title": "Junos OS: IPv6 firewall filter fails to match payload-protocol", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Utilize 'next-header' match instead of 'payload-protocol' in any firewall filter configurations."}], "value": "Utilize 'next-header' match instead of 'payload-protocol' in any firewall filter configurations."}], "x_generator": {"engine": "Vulnogram 0.1.0-dev"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2025-07-11T14:56:28.100417Z", "id": "CVE-2025-52951", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-07-11T14:56:33.215Z"}}]}}

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In essence, these firewall filter terms were being processed as an 'accept' for all traffic on the interface destined for the control plane, even when used in combination with other match criteria.\n\nThis issue only affects firewall filters protecting the device's control plane. Transit firewall filtering is unaffected by this vulnerability.\n\nThis issue affects Junos OS:\u00a0\n\n\n\n * all versions before 21.2R3-S9,\u00a0\n * from 21.4 before 21.4R3-S11,\u00a0\n * from 22.2 before 22.2R3-S7,\u00a0\n * from 22.4 before 22.4R3-S7,\u00a0\n * from 23.2 before 23.2R2-S4,\u00a0\n * from 23.4 before 23.4R2-S5,\u00a0\n * from 24.2 before 24.2R2-S1,\u00a0\n * from 24.4 before 24.4R1-S2, 24.4R2.\n\n\n\nThis is a more complete fix for previously published\u00a0CVE-2024-21607 (JSA75748).", "supportingMedia": [{"type": "text/html", "value": "A Protection Mechanism Failure vulnerability in kernel filter processing of Juniper Networks Junos OS allows an attacker sending IPv6 traffic destined to the device to effectively bypass any firewall filtering configured on the interface.<br><br>Due to an issue with Junos OS kernel filter processing, the 'payload-protocol' match is not being supported, causing any term containing it&nbsp;to accept all packets without taking any other action. In essence, these firewall filter terms were being processed as an 'accept' for all traffic on the interface destined for the control plane, even when used in combination with other match criteria.<br><br>This issue only affects firewall filters protecting the device's control plane. Transit firewall filtering is unaffected by this vulnerability.<br><br><p>This issue affects Junos OS:&nbsp;</p><p></p><ul><li>all versions before 21.2R3-S9,&nbsp;</li><li>from 21.4 before 21.4R3-S11,&nbsp;</li><li>from 22.2 before 22.2R3-S7,&nbsp;</li><li>from 22.4 before 22.4R3-S7,&nbsp;</li><li>from 23.2 before 23.2R2-S4,&nbsp;</li><li>from 23.4 before 23.4R2-S5,&nbsp;</li><li>from 24.2 before 24.2R2-S1,&nbsp;</li><li>from 24.4 before 24.4R1-S2, 24.4R2.</li></ul><br>This is a more complete fix for previously published&nbsp;CVE-2024-21607 (JSA75748).<p></p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-693", "description": "CWE-693: Protection Mechanism Failure"}]}], "configurations": [{"lang": "en", "value": "The following firewall filter configuration, using payload-protocol, will fail to match, allowing traffic to be accepted, rather than discarded:\n\n[firewall family inet6 filter example-filter term reject-tcp from payload-protocol tcp]\n[firewall family inet6 filter example-filter term reject-tcp then discard]\n[firewall family inet6 filter example-filter term allow-rest then accept]", "supportingMedia": [{"type": "text/html", "value": "The following firewall filter configuration, using payload-protocol, will fail to match, allowing traffic to be accepted, rather than discarded:<br><br><tt>[firewall family inet6 filter example-filter term reject-tcp from payload-protocol tcp]<br>[firewall family inet6 filter example-filter term reject-tcp then discard]<br>[firewall family inet6 filter example-filter term allow-rest then accept]</tt>", "base64": false}]}], "providerMetadata": {"orgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "shortName": "juniper", "dateUpdated": "2025-07-15T14:35:11.059Z"}}}, "cveMetadata": {"cveId": "CVE-2025-52951", "state": "PUBLISHED", "dateUpdated": "2025-07-15T14:35:11.059Z", "dateReserved": "2025-06-23T13:16:01.409Z", "assignerOrgId": "8cbe9d5a-a066-4c94-8978-4b15efeae968", "datePublished": "2025-07-11T14:41:03.752Z", "assignerShortName": "juniper"}, "dataVersion": "5.1"}

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supported, causing any term containing it\u00a0to accept all packets without taking any other action. In essence, these firewall filter terms were being processed as an 'accept' for all traffic on the interface destined for the control plane, even when used in combination with other match criteria.\n\nThis issue only affects firewall filters protecting the device's control plane. Transit firewall filtering is unaffected by this vulnerability.\n\nThis issue affects Junos OS:\u00a0\n\n\n\n * all versions before 21.2R3-S9,\u00a0\n * from 21.4 before 21.4R3-S11,\u00a0\n * from 22.2 before 22.2R3-S7,\u00a0\n * from 22.4 before 22.4R3-S7,\u00a0\n * from 23.2 before 23.2R2-S4,\u00a0\n * from 23.4 before 23.4R2-S5,\u00a0\n * from 24.2 before 24.2R2-S1,\u00a0\n * from 24.4 before 24.4R1-S2, 24.4R2.\n\n\n\nThis is a more complete fix for previously published\u00a0CVE-2024-21607 (JSA75748)."}, {"lang": "es", "value": "Una vulnerabilidad de fallo del mecanismo de protecci\u00f3n en el procesamiento del filtro del kernel de Junos OS de Juniper Networks permite a un atacante que env\u00eda tr\u00e1fico IPv6 a una interfaz eludir eficazmente cualquier filtrado del firewall configurado en ella. Debido a un problema con el procesamiento del filtro del kernel de Junos OS, no se admite la coincidencia \"payload-protocol\", lo que provoca que cualquier t\u00e9rmino que la contenga acepte todos los paquetes sin realizar ninguna otra acci\u00f3n. En esencia, estos t\u00e9rminos del filtro del firewall se procesaban como una \"aceptaci\u00f3n\" para todo el tr\u00e1fico de la interfaz. Este problema afecta a Junos OS: * todas las versiones anteriores a 21.2R3-S9, * desde la versi\u00f3n 21.4 hasta la 21.4R3-S11, * desde la versi\u00f3n 22.2 hasta la 22.2R3-S7, * desde la versi\u00f3n 22.4 hasta la 22.4R3-S7, * desde la versi\u00f3n 23.2 hasta la 23.2R2-S4, * desde la versi\u00f3n 23.4 hasta la 23.4R2-S5, * desde la versi\u00f3n 24.2 hasta la 24.2R2-S1, * desde la versi\u00f3n 24.4 hasta la 24.4R1-S2, 24.4R2. Esta es una correcci\u00f3n m\u00e1s completa para la CVE-2024-21607 (JSA75748) publicada anteriormente."}], "id": "CVE-2025-52951", "lastModified": "2026-06-17T09:37:19.363", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "sirt@juniper.net", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "YES", "Recovery": "USER", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "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": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/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:X/RE:M/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "MODERATE"}, "source": "sirt@juniper.net", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-52951", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-07-11T14:56:28.100417Z", "version": "2.0.3"}}]}, "published": "2025-07-11T15:15:25.740", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://supportportal.juniper.net/JSA100055"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-693"}], "source": "sirt@juniper.net", "type": "Secondary"}]}

{}

{"created": "2025-07-12T23:05:33.693915+00:00", "updated": "2025-07-12T23:05:33.693971+00:00", "vendors": ["juniper_networks", "juniper_networks$PRODUCT$junos_os"]}