[ CVE-2026-20557 · Published 2 Nov 2026 ]

Vulnerability in MediaTek, Inc. MediaTek chipset

CVSS 7.5 EPSS <1%2 agency advisoriesNo fix listed yet

[ Description ]Official description

In Modem, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01877236; Issue ID: MSV-9804.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories