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CVE-2026-20433 is a high-severity vulnerability in MediaTek chipsets involving an out-of-bounds write in the modem component due to a missing bounds check. Exploitation requires a user device to connect to a rogue base station controlled by an attacker, with no additional execution privileges needed. User interaction is necessary for exploitation. The vulnerability affects a wide range of MediaTek chipset models. No official patch or remediation level has been confirmed yet.

This vulnerability (CVE-2026-20433) is an out-of-bounds write (CWE-787) in the modem of MediaTek chipsets caused by a missing bounds check. It allows remote escalation of privilege when a user equipment (UE) connects to a malicious base station. The attacker does not require additional execution privileges to exploit this issue, but user interaction is required. The vulnerability impacts numerous MediaTek chipset versions. The CVSS v3.1 score is 8.8, indicating high severity with attack vector being adjacent network, low attack complexity, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability. As of the published date, no patch or official remediation has been confirmed.

Detailed information about CVE-2026-20433: CWE-787 Out-of-bounds Write in MediaTek, Inc. MediaTek chipset affecting MediaTek, Inc. MediaTek chipset. Get real-ti

CVE-2026-20433: CWE-787 Out-of-bounds Write in MediaTek, Inc. MediaTek chipset - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-20433: CWE-787 Out-of-bounds Write in MediaTek, Inc. MediaTek chipset

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