Out-of-bounds write in MediaTek products - CVE-2025-20634

Vulnerability identifier: #VU103562

CSH Severity: High

CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-20634

CWE-ID: CWE-787

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to a missing bounds check within Modem. A remote attacker can trick the victim to open a specially crafted file and execute arbitrary code.

MT6980D
MT8863
MT8798
MT8795T
MT8678
MT8676
MT8673
MT6991
MT6990
MT6989T
MT6989
MT6985T
MT6985
MT6983T
MT6983
MT2737
MT6980
MT6899
MT6897
MT6896
MT6895TT
MT6895
MT6886
MT6879
MT6878M
MT6878
MT6835T
MT6835
MT6813
TB310XU, TB310FU Lenovo Tab M9
TB301XU,TB301FU Lenovo Tab M8 Gen
TB301XU,TB301FU Lenovo Tab M8 4th
TB300XU, TB300FU Lenovo Tab M8 Gen
TB300XU, TB300FU Lenovo Tab M8 4th
TB570FU, TB570ZU Lenovo Tab Extreme
Lenovo Tab M9 (TB310FU/TB310XU/TB310XC)
Lenovo Tab M8 4th Gen 2024 (TB301FU/TB301XU)
Lenovo Tab M8 4th Gen (TB300FU/TB300XU)
Lenovo Tab Extreme (TB570ZU/TB570FU)
Google Android

Install security update from vendor's website.

Google Android - addressed in versions 12L 2025-02-05, 12 2025-02-05, 13 2025-02-05, 14 2025-02-05, 15 2025-02-05

• https://corp.mediatek.com/product-security-bulletin/February-2025

• Multiple vulnerabilities in MediaTek chipsets
• Multiple vulnerabilities in Google Android
• Multiple vulnerabilities in Lenovo Mediatek tablets