#VU103562 Out-of-bounds write in MediaTek products - CVE-2025-20634

Vulnerability identifier: #VU103562

Vulnerability risk: High

CVSSv4.0: 6.1 [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/E:U/U:Amber]

CVE-ID: CVE-2025-20634

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
MT2737
Mobile applications / Mobile firmware & hardware
MT6813
Mobile applications / Mobile firmware & hardware
MT6835
Mobile applications / Mobile firmware & hardware
MT6835T
Mobile applications / Mobile firmware & hardware
MT6878
Mobile applications / Mobile firmware & hardware
MT6878M
Mobile applications / Mobile firmware & hardware
MT6879
Mobile applications / Mobile firmware & hardware
MT6886
Mobile applications / Mobile firmware & hardware
MT6895
Mobile applications / Mobile firmware & hardware
MT6895TT
Mobile applications / Mobile firmware & hardware
MT6896
Mobile applications / Mobile firmware & hardware
MT6897
Mobile applications / Mobile firmware & hardware
MT6899
Mobile applications / Mobile firmware & hardware
MT6980
Mobile applications / Mobile firmware & hardware
MT6980D
Mobile applications / Mobile firmware & hardware
MT6983
Mobile applications / Mobile firmware & hardware
MT6983T
Mobile applications / Mobile firmware & hardware
MT6985
Mobile applications / Mobile firmware & hardware
MT6985T
Mobile applications / Mobile firmware & hardware
MT6989
Mobile applications / Mobile firmware & hardware
MT6989T
Mobile applications / Mobile firmware & hardware
MT6990
Mobile applications / Mobile firmware & hardware
MT6991
Mobile applications / Mobile firmware & hardware
MT8673
Mobile applications / Mobile firmware & hardware
MT8676
Mobile applications / Mobile firmware & hardware
MT8678
Mobile applications / Mobile firmware & hardware
MT8795T
Mobile applications / Mobile firmware & hardware
MT8798
Mobile applications / Mobile firmware & hardware
MT8863
Mobile applications / Mobile firmware & hardware

Vendor: MediaTek

Description

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.

Mitigation
Install security update from vendor's website.

Vulnerable software versions

MT2737: All versions

MT6813: All versions

MT6835: All versions

MT6835T: All versions

MT6878: All versions

MT6878M: All versions

MT6879: All versions

MT6886: All versions

MT6895: All versions

MT6895TT: All versions

MT6896: All versions

MT6897: All versions

MT6899: All versions

MT6980: All versions

MT6980D: All versions

MT6983: All versions

MT6983T: All versions

MT6985: All versions

MT6985T: All versions

MT6989: All versions

MT6989T: All versions

MT6990: All versions

MT6991: All versions

MT8673: All versions

MT8676: All versions

MT8678: All versions

MT8795T: All versions

MT8798: All versions

MT8863: All versions

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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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