{"api_version":"1","generated_at":"2026-08-22T06:10:01+00:00","cve":"CVE-2026-20477","urls":{"html":"https://cve.report/CVE-2026-20477","api":"https://cve.report/api/cve/CVE-2026-20477.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-20477","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-20477"},"summary":{"title":"CVE-2026-20477","description":"In display, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11009963; Issue ID: MSV-7658.","state":"PUBLISHED","assigner":"MediaTek","published_at":"2026-08-03 03:16:42","updated_at":"2026-08-19 17:31:27"},"problem_types":["CWE-787","CWE-787 CWE-787 Out-of-bounds Write"],"metrics":[{"version":"3.1","source":"ADP","type":"DECLARED","score":"6","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","data":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":6,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}},{"version":"3.1","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","score":"6","severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","baseScore":6,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"}}],"references":[{"url":"https://www.mediatek.com/product-security-bulletin/August-2026","name":"https://www.mediatek.com/product-security-bulletin/August-2026","refsource":"security@mediatek.com","tags":["Vendor Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-20477","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20477","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"MediaTek, Inc.","product":"MediaTek chipset","version":"affected MT6991","platforms":[]},{"source":"CNA","vendor":"MediaTek, Inc.","product":"MediaTek chipset","version":"affected MT6993","platforms":[]},{"source":"CNA","vendor":"MediaTek, Inc.","product":"MediaTek chipset","version":"affected MT8188","platforms":[]},{"source":"CNA","vendor":"MediaTek, Inc.","product":"MediaTek chipset","version":"affected MT8189","platforms":[]},{"source":"CNA","vendor":"MediaTek, Inc.","product":"MediaTek chipset","version":"affected MT8668","platforms":[]},{"source":"CNA","vendor":"MediaTek, Inc.","product":"MediaTek chipset","version":"affected MT8676","platforms":[]},{"source":"CNA","vendor":"MediaTek, Inc.","product":"MediaTek chipset","version":"affected MT8678","platforms":[]},{"source":"CNA","vendor":"MediaTek, Inc.","product":"MediaTek chipset","version":"affected MT8781","platforms":[]},{"source":"CNA","vendor":"MediaTek, Inc.","product":"MediaTek chipset","version":"affected MT8799","platforms":[]},{"source":"CNA","vendor":"MediaTek, Inc.","product":"MediaTek chipset","version":"affected MT8910","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2026","cve_id":"20477","vulnerable":"0","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"mediatek","cpe5":"mt6991","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"mediatek","cpe5":"mt6991_firmware","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"0","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"mediatek","cpe5":"mt6993","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"mediatek","cpe5":"mt6993_firmware","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"0","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"mediatek","cpe5":"mt8188","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"mediatek","cpe5":"mt8188_firmware","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"0","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"mediatek","cpe5":"mt8189","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"mediatek","cpe5":"mt8189_firmware","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"0","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"mediatek","cpe5":"mt8668","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"mediatek","cpe5":"mt8668_firmware","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"0","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"mediatek","cpe5":"mt8676","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"mediatek","cpe5":"mt8676_firmware","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"0","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"mediatek","cpe5":"mt8678","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"mediatek","cpe5":"mt8678_firmware","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"0","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"mediatek","cpe5":"mt8781","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"mediatek","cpe5":"mt8781_firmware","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"0","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"mediatek","cpe5":"mt8799","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"mediatek","cpe5":"mt8799_firmware","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"0","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"h","cpe4":"mediatek","cpe5":"mt8910","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2026","cve_id":"20477","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"mediatek","cpe5":"mt8910_firmware","cpe6":"-","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"20477","cve":"CVE-2026-20477","epss":"0.001210000","percentile":"0.022680000","score_date":"2026-08-19","updated_at":"2026-08-20 00:13:09"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"NONE","baseScore":6,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","version":"3.1"}},{"other":{"content":{"id":"CVE-2026-20477","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-08-04T00:00:00+00:00","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-08-05T03:56:48.796Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"MediaTek chipset","vendor":"MediaTek, Inc.","versions":[{"status":"affected","version":"MT6991"},{"status":"affected","version":"MT6993"},{"status":"affected","version":"MT8188"},{"status":"affected","version":"MT8189"},{"status":"affected","version":"MT8668"},{"status":"affected","version":"MT8676"},{"status":"affected","version":"MT8678"},{"status":"affected","version":"MT8781"},{"status":"affected","version":"MT8799"},{"status":"affected","version":"MT8910"}]}],"descriptions":[{"lang":"en","value":"In display, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11009963; Issue ID: MSV-7658."}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","description":"CWE-787 Out-of-bounds Write","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-03T02:05:32.767Z","orgId":"ee979b05-11f8-4f25-a7e0-a1fa9c190374","shortName":"MediaTek"},"references":[{"url":"https://www.mediatek.com/product-security-bulletin/August-2026"}],"x_generator":{"engine":"cvelib 1.8.0"}}},"cveMetadata":{"assignerOrgId":"ee979b05-11f8-4f25-a7e0-a1fa9c190374","assignerShortName":"MediaTek","cveId":"CVE-2026-20477","datePublished":"2026-08-03T02:05:32.767Z","dateReserved":"2025-11-03T01:30:59.016Z","dateUpdated":"2026-08-05T03:56:48.796Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-03 03:16:42","lastModifiedDate":"2026-08-19 17:31:27","problem_types":["CWE-787","CWE-787 CWE-787 Out-of-bounds Write"],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","baseScore":6,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":0.8,"impactScore":5.2}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-08-04T00:00:00+00:00","id":"CVE-2026-20477","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"operator":"AND","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:mediatek:mt8910_firmware:-:*:*:*:*:*:*:*","matchCriteriaId":"A05E635E-9559-4899-A7BA-A74EB6501D1C"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":false,"criteria":"cpe:2.3:h:mediatek:mt8910:-:*:*:*:*:*:*:*","matchCriteriaId":"8C81BC81-1358-4005-8D35-92428D052A65"}]}]},{"operator":"AND","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:mediatek:mt6991_firmware:-:*:*:*:*:*:*:*","matchCriteriaId":"D9DD2119-39E8-4A9C-8E2A-8FB7F92A1001"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":false,"criteria":"cpe:2.3:h:mediatek:mt6991:-:*:*:*:*:*:*:*","matchCriteriaId":"CBBB30DF-E963-4940-B742-F6801F68C3FC"}]}]},{"operator":"AND","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:mediatek:mt6993_firmware:-:*:*:*:*:*:*:*","matchCriteriaId":"FAEB2240-FF37-4CBE-BBEF-8A8281153646"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":false,"criteria":"cpe:2.3:h:mediatek:mt6993:-:*:*:*:*:*:*:*","matchCriteriaId":"57E92BE0-5E65-4770-8E1A-0E5D07A38164"}]}]},{"operator":"AND","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:mediatek:mt8188_firmware:-:*:*:*:*:*:*:*","matchCriteriaId":"30E10DDB-6D3D-42CB-9DB9-ED25E6163D3D"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":false,"criteria":"cpe:2.3:h:mediatek:mt8188:-:*:*:*:*:*:*:*","matchCriteriaId":"BA3D4A45-38EE-4125-AE67-89D1C707F95A"}]}]},{"operator":"AND","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:mediatek:mt8189_firmware:-:*:*:*:*:*:*:*","matchCriteriaId":"527C8F57-8492-49BF-BCA9-0D77011D3493"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":false,"criteria":"cpe:2.3:h:mediatek:mt8189:-:*:*:*:*:*:*:*","matchCriteriaId":"AE35C440-2C15-42FF-ADD0-D99C0FB7D1C9"}]}]},{"operator":"AND","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:mediatek:mt8668_firmware:-:*:*:*:*:*:*:*","matchCriteriaId":"3EAACB56-716C-4E17-AB78-F5E68B75B791"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":false,"criteria":"cpe:2.3:h:mediatek:mt8668:-:*:*:*:*:*:*:*","matchCriteriaId":"2589C222-3D62-4BDB-98F2-5F1E38600D8D"}]}]},{"operator":"AND","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:mediatek:mt8676_firmware:-:*:*:*:*:*:*:*","matchCriteriaId":"645D7C99-A0A0-4FB0-97AC-3DA5161A44D9"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":false,"criteria":"cpe:2.3:h:mediatek:mt8676:-:*:*:*:*:*:*:*","matchCriteriaId":"EE302F6F-170E-4350-A8F4-65BE0C50CB78"}]}]},{"operator":"AND","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:mediatek:mt8678_firmware:-:*:*:*:*:*:*:*","matchCriteriaId":"CFEC7A7B-6948-4B8A-BFA1-9F9D07043605"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":false,"criteria":"cpe:2.3:h:mediatek:mt8678:-:*:*:*:*:*:*:*","matchCriteriaId":"152A5F3D-8004-4649-BDB1-E6F0798AF1CB"}]}]},{"operator":"AND","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:mediatek:mt8781_firmware:-:*:*:*:*:*:*:*","matchCriteriaId":"7E2280E5-F903-4541-8404-9F789CEFF172"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":false,"criteria":"cpe:2.3:h:mediatek:mt8781:-:*:*:*:*:*:*:*","matchCriteriaId":"533284E5-C3AF-48D3-A287-993099DB2E41"}]}]},{"operator":"AND","nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:mediatek:mt8799_firmware:-:*:*:*:*:*:*:*","matchCriteriaId":"BB8ADEB7-A1A3-4781-BB65-4D2AF9896F80"}]},{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":false,"criteria":"cpe:2.3:h:mediatek:mt8799:-:*:*:*:*:*:*:*","matchCriteriaId":"ACB27F98-6318-44C8-A28D-375A357A03CA"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"20477","Ordinal":"1","Title":"CVE-2026-20477","CVE":"CVE-2026-20477","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"20477","Ordinal":"1","NoteData":"In display, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11009963; Issue ID: MSV-7658.","Type":"Description","Title":"CVE-2026-20477"}]}}}