CVE-2026-20402

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This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY00693083; Issue ID: MSV-5928."}, {"lang": "es", "value": "En el m\u00f3dem, existe una posible ca\u00edda del sistema debido a una validaci\u00f3n de entrada incorrecta. Esto podr\u00eda llevar a una denegaci\u00f3n de servicio remota, si un UE se ha conectado a una estaci\u00f3n base maliciosa controlada por el atacante, sin necesidad de privilegios de ejecuci\u00f3n adicionales. No se necesita interacci\u00f3n del usuario para la explotaci\u00f3n. ID del parche: MOLY00693083; ID del problema: MSV-5928."}], "id": "CVE-2026-20402", "lastModified": "2026-06-17T10:17:21.550", "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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-20402", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-17T14:17:13.680775Z", "version": "2.0.3"}}]}, "published": "2026-02-02T09:15:54.830", "references": [{"source": "security@mediatek.com", "tags": ["Vendor Advisory"], "url": "https://corp.mediatek.com/product-security-bulletin/February-2026"}], "sourceIdentifier": "security@mediatek.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "security@mediatek.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-18T00:42:10.032434+00:00", "value": {"mitigation_remediation": ["Apply vendor\u2011supplied patch MOLY00693083 or upgrade firmware to a version that includes the fix.", "Verify base station authentication to ensure only trusted operators can associate with the device, mitigating rogue\u2011station exploitation.", "Monitor modem logs for crash events and isolate affected units until an official update is deployed."], "summary": {"action": "Immediate Patch", "impact": "Remote Denial of Service"}, "threat_synthesis": {"affected_systems": "MediaTek chipsets such as MT2735, MT6833, MT6853, MT6855, MT6873, MT6875, MT6877, MT6880, MT6883, MT6885, MT6889, MT6890, MT6891, MT6893, MT8675, MT8771, MT8791, MT8791t, MT8797 and the NR15 series are impacted. Devices that use any of these hardware blocks are vulnerable until a firmware update that incorporates the fix is applied.", "description_and_impact": "Improper input validation within the modem component can cause a system crash when it receives malformed data. The flaw triggers a denial\u2011of\u2011service condition that can be activated remotely without user interaction or any privilege escalation. The weakness aligns with CWE\u2011787, indicating a buffer misuse that allows injected input to corrupt memory and crash the stage managing the radio interface.", "risk_and_exploitability": "The CVSS score of 6.5 reflects moderate severity, while an EPSS score of less than 1% indicates a very low probability of exploitation at present. The vulnerability does not appear in the CISA Known Exploited Vulnerabilities list. The attack can be carried out by an adversary controlling a rogue base station that delivers malformed data to the modem; no additional credentials or user action are required."}}}}, "created": "2026-02-04T12:44:44.839281+00:00", "title": "Modem Input Validation Failure Allowing Remote Denial of Service on MediaTek Chipsets", "updated": "2026-04-18T00:45:32.244706+00:00", "vendors": ["mediatek", "mediatek$PRODUCT$mt2735", "mediatek$PRODUCT$mt6833", "mediatek$PRODUCT$mt6853", "mediatek$PRODUCT$mt6855", "mediatek$PRODUCT$mt6873", "mediatek$PRODUCT$mt6875", "mediatek$PRODUCT$mt6877", "mediatek$PRODUCT$mt6880", "mediatek$PRODUCT$mt6883", "mediatek$PRODUCT$mt6885", "mediatek$PRODUCT$mt6889", "mediatek$PRODUCT$mt6890", "mediatek$PRODUCT$mt6891", "mediatek$PRODUCT$mt6893", "mediatek$PRODUCT$mt8675", "mediatek$PRODUCT$mt8771", "mediatek$PRODUCT$mt8791", "mediatek$PRODUCT$mt8791t", "mediatek$PRODUCT$mt8797"]}