CVE-2026-21912

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executing the 'show system firmware' CLI command to cause an LC480 or LC2101 line card to reset.\n\nOn MX10k Series systems with LC480 or LC2101 line cards, repeated execution of the 'show system firmware' CLI command can cause the line card to crash and restart. Additionally, some time after the line card crashes, chassisd may also crash and restart, generating a core dump.This issue affects Junos OS on MX10k Series:\u00a0\n\n\n\n * all versions before 21.2R3-S10,\u00a0\n * from 21.4 before 21.4R3-S9,\u00a0\n * from 22.2 before 22.2R3-S7,\u00a0\n * from 22.4 before 22.4R3-S6,\u00a0\n * from 23.2 before 23.2R2-S2,\u00a0\n * from 23.4 before 23.4R2-S3,\u00a0\n * from 24.2 before 24.2R2."}, {"lang": "es", "value": "Una vulnerabilidad de condici\u00f3n de carrera (TOCTOU) de tiempo de verificaci\u00f3n y tiempo de uso en el m\u00e9todo para recopilar estad\u00edsticas de firmware Ethernet FPC de Juniper Networks Junos OS en la serie MX10k permite a un atacante local con pocos privilegios que ejecuta el comando CLI 'show system firmware' causar que una tarjeta de l\u00ednea LC480 o LC2101 se reinicie.\n\nEn sistemas de la serie MX10k con tarjetas de l\u00ednea LC480 o LC2101, la ejecuci\u00f3n repetida del comando CLI 'show system firmware' puede causar que la tarjeta de l\u00ednea falle y se reinicie. Adem\u00e1s, alg\u00fan tiempo despu\u00e9s de que la tarjeta de l\u00ednea falle, chassisd tambi\u00e9n puede fallar y reiniciarse, generando un volcado de memoria. Este problema afecta a Junos OS en la serie MX10k:\n\n * todas las versiones anteriores a 21.2R3-S10,\n * desde 21.4 anteriores a 21.4R3-S9,\n * desde 22.2 anteriores a 22.2R3-S7,\n * desde 22.4 anteriores a 22.4R3-S6,\n * desde 23.2 anteriores a 23.2R2-S2,\n * desde 23.4 anteriores a 23.4R2-S3,\n * desde 24.2 anteriores a 24.2R2."}], "id": "CVE-2026-21912", "lastModified": "2026-06-17T10:19:08.750", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "sirt@juniper.net", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "YES", "Recovery": "AUTOMATIC", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.8, "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": "LOW", "providerUrgency": "AMBER", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/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:A/V:X/RE:M/U:Amber", "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-2026-21912", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-15T20:50:22.948273Z", "version": "2.0.3"}}]}, "published": "2026-01-15T21:16:07.357", "references": [{"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://kb.juniper.net/JSA106011"}, {"source": "sirt@juniper.net", "tags": ["Vendor Advisory"], "url": "https://supportportal.juniper.net/JSA106011"}], "sourceIdentifier": "sirt@juniper.net", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-367"}], "source": "sirt@juniper.net", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-18T05:57:28.611370+00:00", "value": {"mitigation_remediation": ["Update Junos OS to 21.2R3\u2011S10 or any later release that addresses the issue.", "Restrict 'show system firmware' to authorized operators by configuring CLI authorization rules.", "Continuously monitor line card status and chassis logs for unexpected resets, and perform maintenance or replacement during planned downtime if resets persist."], "summary": {"action": "Patch", "impact": "Disruption of line card operation due to a local race condition"}, "threat_synthesis": {"affected_systems": "The issue affects Juniper Networks Junos OS on MX10k Series devices equipped with LC480 or LC2101 line cards. All software releases prior to 21.2R3\u2011S10, before 21.4R3\u2011S9, before 22.2R3\u2011S7, before 22.4R3\u2011S6, before 23.2R2\u2011S2, before 23.4R2\u2011S3, and before 24.2R2 are vulnerable. The affected products include the MX10k Series chassis and the specified line cards, and any Junos OS installation matching these release ranges.", "description_and_impact": "A Time\u2011of\u2011check Time\u2011of\u2011use race condition in Junos OS allows a local low\u2011privileged user to trigger a line card reset by repeatedly running the 'show system firmware' CLI command. The vulnerability can cause an LC480 or LC2101 card to reboot, and after a short delay the chassis daemon may also crash and restart, producing a core dump. The impact is disruption of network services on the affected device, with possible loss of traffic paths and increased maintenance overhead.", "risk_and_exploitability": "The CVSS score of 6.8 indicates moderate severity, while the EPSS score of less than 1% suggests low likelihood of exploitation in the wild at present. Since the vulnerability requires local low\u2011privileged access and involves a race condition, an attacker must have console or privileged SSH access to the router. The vendor has not listed this as a Known Exploited Vulnerability, so no publicly available exploit has been confirmed. Nevertheless, the disruption potential warrants prompt remediation, particularly in environments where line card reliability is critical. If the device is exposed to an attacker who can run CLI commands, the local low\u2011privileged user could repeatedly invoke the command to reset the line card or potentially destabilize the chassis."}}}}, "created": "2026-01-16T13:42:47.945134+00:00", "updated": "2026-04-18T06:00:08.506824+00:00", "vendors": ["juniper_networks", "juniper_networks$PRODUCT$junos_os"]}