CVE-2026-20466 | BDVDB-2026-354802 Detail

MediaTekMediaTek chipset

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.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact none. Attack vector: physical.

Weaknesses#

CWE-787 Out-of-bounds Write

References#

https://www.mediatek.com/product-security-bulletin/August-2026

Exploit#

No public exploit known

History#

Version 12026-08-03Record published in the CVE List.

Published

Published: 2026-08-03
Last modified: 2026-08-03

Vendor information

Vendor: MediaTek
Product: MediaTek chipset

All MediaTek vulnerabilities

Score

6.1 Medium

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 5.9.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
MT2737
Fixed
Not stated
Vulnerable
MT6880
Fixed
Not stated
Vulnerable
MT6890
Fixed
Not stated
Vulnerable
MT6990
Fixed
Not stated

Scoring System

CVSS v4.0

Not available

CVSS v3.1

6.1 Medium

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Metric breakdown
Attack Vector	Physical
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).