CVE-2026-57030

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During the removal process the timeout of a flow should be set to 3 seconds and consequentially the flow should be removed shortly after. Due to a race condition occurring when setting the timeout there is a chance (the exact conditions are outside the attackers control) that the timeout is instead set to a very high value of larger than 10,000 seconds:<br><br>\n\n<tt>user@host&gt; show security flow session | match timeout<br>Session ID: 98784248524, Policy name: PROD-FLOW/4, HA State: Active, Timeout: 85250, Session State: Valid</tt><br><br>This will lead to an accumulation of flows which can be observed by an ever-increasing value of invalidated sessions in the output of 'show security flow session summary':<br><br><tt>user@host&gt; show security flow session summary | match invalid<br>Invalidated sessions: 216931</tt><p>These sessions can't be cleared manually with the 'clear security flow session' command, which will either lead to forwarding to stop (and the system needs to be manually recovered with a reboot) or to a flowd core and automatic reboot.</p><p><br>This issue affects Junos OS on SRX Series:<br></p><ul><li>24.2 versions before 24.2R2-S3,</li><li>24.4 versions before 24.4R2-S1, 24.4R2-S2,</li><li>25.2&nbsp;versions&nbsp;before 25.2R1-S2, 25.2R2.</li></ul><p></p><p>This issue does not affect releases earlier than 24.2R1;</p>"}], "value": "A Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).\n\nAs part of the stateful traffic processing on SRX Series devices flows are being established, and removed when not needed anymore. 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During the removal process the timeout of a flow should be set to 3 seconds and consequentially the flow should be removed shortly after. Due to a race condition occurring when setting the timeout there is a chance (the exact conditions are outside the attackers control) that the timeout is instead set to a very high value of larger than 10,000 seconds:\n\n\n\nuser@host> show security flow session | match timeout\nSession ID: 98784248524, Policy name: PROD-FLOW/4, HA State: Active, Timeout: 85250, Session State: Valid\n\nThis will lead to an accumulation of flows which can be observed by an ever-increasing value of invalidated sessions in the output of 'show security flow session summary':\n\nuser@host> show security flow session summary | match invalid\nInvalidated sessions: 216931These sessions can't be cleared manually with the 'clear security flow session' command, which will either lead to forwarding to stop (and the system needs to be manually recovered with a reboot) or to a flowd core and automatic reboot.\n\n\nThis issue affects Junos OS on SRX Series:\n\n\n * 24.2 versions before 24.2R2-S3,\n * 24.4 versions before 24.4R2-S1, 24.4R2-S2,\n * 25.2\u00a0versions\u00a0before 25.2R1-S2, 25.2R2.\n\n\n\n\nThis issue does not affect releases earlier than 24.2R1;", "supportingMedia": [{"type": "text/html", "value": "A Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).<br><br>As part of the stateful traffic processing on SRX Series devices flows are being established, and removed when not needed anymore. 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devices flows are being established, and removed when not needed anymore. During the removal process the timeout of a flow should be set to 3 seconds and consequentially the flow should be removed shortly after. Due to a race condition occurring when setting the timeout there is a chance (the exact conditions are outside the attackers control) that the timeout is instead set to a very high value of larger than 10,000 seconds:\n\n\n\nuser@host> show security flow session | match timeout\nSession ID: 98784248524, Policy name: PROD-FLOW/4, HA State: Active, Timeout: 85250, Session State: Valid\n\nThis will lead to an accumulation of flows which can be observed by an ever-increasing value of invalidated sessions in the output of 'show security flow session summary':\n\nuser@host> show security flow session summary | match invalid\nInvalidated sessions: 216931These sessions can't be cleared manually with the 'clear security flow session' command, which will either lead to forwarding to stop (and the system needs to be manually recovered with a reboot) or to a flowd core and automatic reboot.\n\n\nThis issue affects Junos OS on SRX Series:\n\n\n * 24.2 versions before 24.2R2-S3,\n * 24.4 versions before 24.4R2-S1, 24.4R2-S2,\n * 25.2\u00a0versions\u00a0before 25.2R1-S2, 25.2R2.\n\n\n\n\nThis issue does not affect releases earlier than 24.2R1;"}, {"lang": "es", "value": "Una vulnerabilidad de Ejecuci\u00f3n Concurrente usando Recurso Compartido con Sincronizaci\u00f3n Inadecuada (\u2019Condici\u00f3n de Carrera\u2019) en el motor de reenv\u00edo de paquetes (PFE) de Juniper Networks Junos OS en la serie SRX permite a un atacante no autenticado, basado en red, causar una Denegaci\u00f3n de Servicio (DoS).\n\nComo parte del procesamiento de tr\u00e1fico con estado en los dispositivos de la serie SRX, se establecen flujos y se eliminan cuando ya no son necesarios. Durante el proceso de eliminaci\u00f3n, el tiempo de espera de un flujo deber\u00eda establecerse en 3 segundos y, en consecuencia, el flujo deber\u00eda eliminarse poco despu\u00e9s. Debido a una condici\u00f3n de carrera que ocurre al establecer el tiempo de espera, existe la posibilidad (las condiciones exactas est\u00e1n fuera del control del atacante) de que el tiempo de espera se establezca en un valor muy alto, superior a 10.000 segundos:\n\nuser@host> show security flow session | match timeout\nSession ID: 98784248524, Policy name: PROD-FLOW/4, HA State: Active, Timeout: 85250, Session State: Valid\n\nEsto conducir\u00e1 a una acumulaci\u00f3n de flujos, lo que puede observarse por un valor cada vez mayor de sesiones invalidadas en la salida de \u2019show security flow session summary\u2019:\n\nuser@host> show security flow session summary | match invalid\nInvalidated sessions: 216931\n\nEstas sesiones no pueden borrarse manualmente con el comando \u2019clear security flow session\u2019, lo que conducir\u00e1 a que el reenv\u00edo se detenga (y el sistema deba recuperarse manualmente con un reinicio) o a un flowd core y reinicio autom\u00e1tico.\n\nEste problema afecta a Junos OS en la serie SRX:\n\n * versiones 24.2 anteriores a 24.2R2-S3,\n * versiones 24.4 anteriores a 24.4R2-S1, 24.4R2-S2,\n * versiones 25.2 anteriores a 25.2R1-S2, 25.2R2.\n\nEste problema no afecta a las versiones anteriores a 24.2R1;"}], "id": "CVE-2026-57030", "lastModified": "2026-10-25T15:10:00.147", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "sirt@juniper.net", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "YES", "Recovery": "USER", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.2, "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:P/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: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-2026-57030", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-10T14:42:22.610309Z", "version": "2.0.3"}}]}, "published": "2026-07-09T22:17:08.643", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://supportportal.juniper.net/JSA110090"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "sirt@juniper.net", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["srx_series"], "status": "affected", "versions": {"scheme": "generic", "value": "[24.2,24.2R2-S3)"}}, {"platform": ["srx_series"], "status": "affected", "versions": {"scheme": "generic", "value": "[24.4,24.4R2-S1)"}}, {"platform": ["srx_series"], "status": "affected", "versions": {"scheme": "generic", "value": "[25.2,25.2R1-S2)"}}, {"platform": ["srx_series"], "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,24.2R1)"}}], "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"}], "created": "2026-07-09T23:15:06.853480+00:00", "updated": "2026-08-01T14:00:06.203196+00:00", "vendors": ["juniper_networks", "juniper_networks$PRODUCT$junos_os"]}