Review reviewHigh

CVE-2026-20479

MediaTek, Inc. MediaTek chipset

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.

CVSS: 7.5
EPSS: -
CISA KEV: Not listed
Published: 2026.08.03

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability-

Technical severityCVSS 7.5

Vulnerability overview

Affected product and versions

Product: MediaTek, Inc. MediaTek chipset
Affected versions: >= MT2735, >= MT6833, >= MT6853, >= MT6855, >= MT6873, >= MT6875, >= MT6877, >= MT6880, >= MT6883, >= MT6885, >= MT6889, >= MT6890, >= MT6891, >= MT6893, >= MT8675, >= MT8771, >= MT8791, >= MT8791T, >= MT8797
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that MediaTek, Inc. MediaTek chipset and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-125