{"id":"CVE-2026-20519","title":"In Modem, there is a possible out of bounds write due to a missing bounds check","summary":"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 pr…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-787"],"vendor":"mediatek","product":"mt6833_firmware","affected":["mt6833_firmware","mt6835_firmware","mt6853_firmware","mt6855_firmware","mt6858_firmware","mt6873_firmware","mt6875_firmware","mt6877_firmware","mt6878_firmware","mt6879_firmware","mt6880_firmware","mt6881_firmware","mt6883_firmware","mt6885_firmware","mt6886_firmware","mt6889_firmware","mt6890_firmware","mt6891_firmware","mt6893_firmware","mt6895_firmware","mt6896_firmware","mt6897_firmware","mt6899_firmware","mt6980_firmware","mt6982_firmware","mt6983_firmware","mt6985_firmware","mt6986_firmware","mt6988_firmware","mt6989_firmware","mt6990_firmware","mt6991_firmware","mt6993_firmware","mt8668_firmware","mt8676_firmware","mt8678_firmware","mt8755_firmware","mt8771_firmware","mt8775_firmware","mt8791_firmware","mt2716_firmware","mt2735_firmware","mt2737_firmware","mt6813_firmware","mt6815_firmware","mt8791t_firmware","mt8792_firmware","mt8793_firmware","mt8796_firmware","mt8797_firmware","mt8798_firmware","mt8863_firmware","mt8873_firmware","mt8883_firmware","mt8893_firmware","mt8695_firmware","mt8696_firmware"],"published":"2026-10-05","updated":"2026-10-08","sourceUpdated":"2026-10-08T14:49:49.330","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-20519","references":[{"url":"https://www.mediatek.com/product-security-bulletin/October-2026","label":"security@mediatek.com"}],"tags":["nvd","cve.org"],"epss":0.00228,"epssPercentile":0.13489,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-05T10:35:10.989384Z"},"ingestedAt":"2026-10-05T02:10:36.196Z","slug":"CVE-2026-20519","body":"## Overview\n\nIn 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: MOLY01778993; Issue ID: MSV-8898.\n\n## Affected\n\n- `mt6833_firmware`\n- `mt6835_firmware`\n- `mt6853_firmware`\n- `mt6855_firmware`\n- `mt6858_firmware`\n- `mt6873_firmware`\n- `mt6875_firmware`\n- `mt6877_firmware`\n- `mt6878_firmware`\n- `mt6879_firmware`\n- `mt6880_firmware`\n- `mt6881_firmware`\n- `mt6883_firmware`\n- `mt6885_firmware`\n- `mt6886_firmware`\n- `mt6889_firmware`\n- `mt6890_firmware`\n- `mt6891_firmware`\n- `mt6893_firmware`\n- `mt6895_firmware`\n- `mt6896_firmware`\n- `mt6897_firmware`\n- `mt6899_firmware`\n- `mt6980_firmware`\n- `mt6982_firmware`\n- `mt6983_firmware`\n- `mt6985_firmware`\n- `mt6986_firmware`\n- `mt6988_firmware`\n- `mt6989_firmware`\n- `mt6990_firmware`\n- `mt6991_firmware`\n- `mt6993_firmware`\n- `mt8668_firmware`\n- `mt8676_firmware`\n- `mt8678_firmware`\n- `mt8755_firmware`\n- `mt8771_firmware`\n- `mt8775_firmware`\n- `mt8791_firmware`\n- `mt2716_firmware`\n- `mt2735_firmware`\n- `mt2737_firmware`\n- `mt6813_firmware`\n- `mt6815_firmware`\n- `mt8791t_firmware`\n- `mt8792_firmware`\n- `mt8793_firmware`\n- `mt8796_firmware`\n- `mt8797_firmware`\n- `mt8798_firmware`\n- `mt8863_firmware`\n- `mt8873_firmware`\n- `mt8883_firmware`\n- `mt8893_firmware`\n- `mt8695_firmware`\n- `mt8696_firmware`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":215738,"id":"CVE-2026-20519","ts":1791199140332,"field":"cvss","old":null,"new":"7.5"},{"seq":215737,"id":"CVE-2026-20519","ts":1791199140332,"field":"severity","old":"none","new":"high"}]}