CVE-2026-20479

Published: Aug 3, 2026Modified: Aug 19, 2026

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 3.6

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

In Modem, there is a possible out of bounds read due to a missing bounds check. This could lead to remote denial of service, 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: MOLY00741071; Issue ID: MSV-7620.

Affected (19)

Products: Mediatek: Mt2735 Firmware, Mt6833 Firmware, Mt6853 Firmware, Mt6855 Firmware, Mt6873 Firmware, Mt6875 Firmware, Mt6877 Firmware, Mt6880 Firmware, Mt6883 Firmware, Mt6885 Firmware, Mt6889 Firmware, Mt6890 Firmware, Mt6891 Firmware, Mt6893 Firmware, Mt8675 Firmware, Mt8771 Firmware, Mt8791 Firmware, Mt8791t Firmware, Mt8797 Firmware

Configuration A

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt2735 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt2735	All versions

Configuration B

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt6833 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt6833	All versions

Configuration C

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt6853 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt6853	All versions

Configuration D

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt6855 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt6855	All versions

Configuration E

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt6873 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt6873	All versions

Configuration F

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt6875 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt6875	All versions

Configuration G

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt6877 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt6877	All versions

Configuration H

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt6880 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt6880	All versions

Configuration I

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt6883 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt6883	All versions

Configuration J

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt6885 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt6885	All versions

Configuration K

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt6889 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt6889	All versions

Configuration L

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt6890 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt6890	All versions

Configuration M

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt6891 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt6891	All versions

Configuration N

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt6893 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt6893	All versions

Configuration O

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt8675 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt8675	All versions

Configuration P

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt8771 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt8771	All versions

Configuration Q

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt8791 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt8791	All versions

Configuration R

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt8791t Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt8791t	All versions

Configuration S

1 vulnerable · 1 platform

Vulnerable Software	Affected Versions
Mediatek Mt8797 Firmware	All versions

Running on/with	Platform Versions
Mediatek Mt8797	All versions

Related CWEs

CWE-125

Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

References (1)

https://www.mediatek.com/product-security-bulletin/August-2026

Source: security@mediatek.com

Vendor Advisory

Timeline

No history available yet.