#VU108518 Out-of-bounds write in MediaTek products - CVE-2025-20671

Vulnerability identifier: #VU108518

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-20671

CWE-ID: CWE-787

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
MT2718
Mobile applications / Mobile firmware & hardware
MT6878
Mobile applications / Mobile firmware & hardware
MT6897
Mobile applications / Mobile firmware & hardware
MT6899
Mobile applications / Mobile firmware & hardware
MT6989
Mobile applications / Mobile firmware & hardware
MT6991
Mobile applications / Mobile firmware & hardware
MT8196
Mobile applications / Mobile firmware & hardware
MT8391
Mobile applications / Mobile firmware & hardware
MT8676
Mobile applications / Mobile firmware & hardware
MT8678
Mobile applications / Mobile firmware & hardware

Vendor: MediaTek

Description

The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing untrusted input in thermal. A local user can trigger an out-of-bounds write and gain elevated privileges on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

MT2718: All versions

MT6878: All versions

MT6897: All versions

MT6899: All versions

MT6989: All versions

MT6991: All versions

MT8196: All versions

MT8391: All versions

MT8676: All versions

MT8678: All versions

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External links
https://corp.mediatek.com/product-security-bulletin/May-2025

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.