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CVE-2026-20466: CWE-787 Out-of-bounds Write in MediaTek, Inc. MediaTek chipset

0
High
VulnerabilityCVE-2026-20466cvecve-2026-20466cwe-787
Published: 08/03/2026 (08/03/2026, 02:05:17 UTC)
Source: CVE Database V5
Vendor/Project: MediaTek, Inc.
Product: MediaTek chipset

Description

CVE-2026-20466 is a heap buffer overflow vulnerability in the secure boot component of certain MediaTek chipsets. This flaw allows a local attacker with physical access to the device to escalate privileges without requiring additional execution privileges or user interaction. The affected chipsets include MT2737, MT6880, MT6890, and MT6990. No CVSS score or official patch status is currently provided.

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 08/03/2026, 03:24:42 UTC

Technical Analysis

This vulnerability involves an out-of-bounds write (CWE-787) in the secure boot process of MediaTek chipsets MT2737, MT6880, MT6890, and MT6990. The heap buffer overflow can be exploited locally by an attacker with physical access to escalate privileges. Exploitation does not require user interaction or prior execution privileges. Patch identifiers are noted (AUTO00845351 for MT2737 and ALPS11072643 for MT6880, MT6890, MT6990), but no official remediation level or patch availability is confirmed in the advisory.

Potential Impact

Successful exploitation could lead to local privilege escalation on affected devices, potentially allowing an attacker with physical access to gain higher privileges than intended. There is no indication of remote exploitation or need for user interaction. No known exploits are reported in the wild at this time.

Mitigation Recommendations

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The vendor has referenced patch IDs related to this issue, but no official fix or remediation level is stated in the available data. Until an official patch is confirmed, restrict physical access to affected devices to mitigate risk.

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Technical Details

Data Version
5.2
Assigner Short Name
MediaTek
Date Reserved
2025-11-03T01:30:59.015Z
Cvss Version
null
State
PUBLISHED
Remediation Level
null

Threat ID: 6a700181bf32cb7a34d5c9e2

Added to database: 08/03/2026, 02:48:33 UTC

Last enriched: 08/03/2026, 03:24:42 UTC

Last updated: 08/03/2026, 03:37:47 UTC

Views: 2

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