CVE-2026-20466
Received Received - Intake

Heap Buffer Overflow in MediaTek Sec Boot

Publication date: 2026-08-03

Last updated on: 2026-08-03

Assigner: MediaTek, Inc.

Description
In sec boot, there is a possible escalation of privilege due to a heap buffer overflow. This could lead to local escalation of privilege, if an attacker has physical access to the device, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: AUTO00845351 (Note: For MT2737) / ALPS11072643 (Note: For MT6880, MT6890, MT6990); Issue ID: MSV-6929.

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Meta Information

Published
2026-08-03
Last Modified
2026-08-03
Generated
2026-08-03
AI Q&A
2026-08-03
EPSS Evaluated
N/A
NVD
CVE-2026-20466
EUVD
EUVD-2026-52056

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mediatek mt2737 From AUTO00845351 (inc)
mediatek mt6880 From ALPS11072643 (inc)
mediatek mt6890 From ALPS11072643 (inc)
mediatek mt6990 From ALPS11072643 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

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Executive Summary

This vulnerability is a heap buffer overflow in the secure boot process of certain MediaTek devices. It allows an attacker with physical access to escalate privileges without needing additional execution permissions or user interaction.

Detection Guidance

This vulnerability is specific to MediaTek hardware (MT2737, MT6880, MT6890, MT6990) and requires physical access to exploit. Detection may involve checking for unauthorized modifications or unusual behavior in sec boot processes. No direct commands are provided in the context.

Impact Analysis

If exploited, this vulnerability could allow an attacker to gain higher privileges on your device, potentially leading to unauthorized access or control. Physical access to the device is required for exploitation.

Compliance Impact

The provided CVE data does not specify any direct impact on compliance with standards like GDPR or HIPAA. The vulnerability involves a heap buffer overflow in sec boot leading to local privilege escalation with physical access, but no details are given about data exposure or regulatory implications.

Mitigation Strategies

Apply the provided patches for your device model (MT2737, MT6880, MT6890, or MT6990) immediately. Ensure physical access to devices is restricted to authorized personnel only.

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