{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-20557","assignerOrgId":"ee979b05-11f8-4f25-a7e0-a1fa9c190374","state":"PUBLISHED","assignerShortName":"MediaTek","dateReserved":"2025-11-03T01:30:59.043Z","datePublished":"2026-11-02T02:33:18.187Z","dateUpdated":"2026-11-04T04:55:35.117Z"},"containers":{"cna":{"providerMetadata":{"orgId":"ee979b05-11f8-4f25-a7e0-a1fa9c190374","shortName":"MediaTek","dateUpdated":"2026-11-02T02:33:18.187Z"},"descriptions":[{"lang":"en","value":"In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege, 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: MOLY01877236; Issue ID: MSV-9804."}],"affected":[{"vendor":"MediaTek, Inc.","product":"MediaTek chipset","defaultStatus":"unaffected","versions":[{"version":"MT2716","status":"affected"},{"version":"MT6813","status":"affected"},{"version":"MT6815","status":"affected"},{"version":"MT6835","status":"affected"},{"version":"MT6858","status":"affected"},{"version":"MT6878","status":"affected"},{"version":"MT6881","status":"affected"},{"version":"MT6897","status":"affected"},{"version":"MT6899","status":"affected"},{"version":"MT6982","status":"affected"},{"version":"MT6986","status":"affected"},{"version":"MT6988","status":"affected"},{"version":"MT6991","status":"affected"},{"version":"MT6993","status":"affected"},{"version":"MT8668","status":"affected"},{"version":"MT8676","status":"affected"},{"version":"MT8678","status":"affected"},{"version":"MT8755","status":"affected"},{"version":"MT8775","status":"affected"},{"version":"MT8792","status":"affected"},{"version":"MT8793","status":"affected"},{"version":"MT8863","status":"affected"},{"version":"MT8873","status":"affected"},{"version":"MT8875","status":"affected"},{"version":"MT8883","status":"affected"}]}],"references":[{"url":"https://www.mediatek.com/product-security-bulletin/November-2026"}],"problemTypes":[{"descriptions":[{"type":"CWE","lang":"en","cweId":"CWE-787","description":"CWE-787 Out-of-bounds Write"}]}],"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"ADJACENT_NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"HIGH","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-11-02T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-20557"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-11-04T04:55:35.117Z"}}]}}