CVE-2026-20477: MediaTek MT6991 Firmware

Medium severity, CVSS 6.0. EPSS: 0.2% chance of exploitation in the next 30 days.

In display, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11009963; Issue ID: MSV-7658.

Affected products

• MediaTek MT6991 Firmware: affected versions not specified
• MediaTek MT6993 Firmware: affected versions not specified
• MediaTek MT8188 Firmware: affected versions not specified
• MediaTek MT8189 Firmware: affected versions not specified
• MediaTek MT8668 Firmware: affected versions not specified
• MediaTek MT8676 Firmware: affected versions not specified
• MediaTek MT8678 Firmware: affected versions not specified
• MediaTek MT8781 Firmware: affected versions not specified
• MediaTek MT8799 Firmware: affected versions not specified
• MediaTek MT8910 Firmware: affected versions not specified

Published 2026-08-03. Last modified 2026-08-19.