Buffer overflow in Mediatek, Inc. Mediatek Chipset
CVE-2026-20466
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.
Vulnerability class: Buffer Overflow
EPSS: 0.002 (6.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Mediatek, Inc. Mediatek Chipset — versions MT2737, MT6880, MT6890
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20466?
- CVE-2026-20466 is a medium-severity vulnerability in Mediatek, Inc. Mediatek Chipset, classified under Out-of-bounds Write. CVSS score: 6.1/10. Published 2026-08-03.
- How severe is CVE-2026-20466?
- Medium severity. CVSS v3 base score is 6.1 out of 10.