CVE-2026-20458 - Vulnerability Details

- Memory Corruption in MediaTek Modem Firmware Enables Remote Privilege Escalation

Description

In Modem, there is a possible memory corruption 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: MOLY01402160; Issue ID: MSV-7298.

Published: 2026-07-01

Score: 7.5 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

MediaTek, Inc.

MediaTek chipset

unaffected

Version	Status	Constraints
`MT2716`	affected	—
`MT2737`	affected	—
`MT6739`	affected	—
`MT6761`	affected	—
`MT6762`	affected	—
`MT6763`	affected	—
`MT6765`	affected	—
`MT6767`	affected	—
`MT6768`	affected	—
`MT6769`	affected	—
`MT6771`	affected	—
`MT6779`	affected	—
`MT6781`	affected	—
`MT6783`	affected	—
`MT6785`	affected	—
`MT6789`	affected	—
`MT6813`	affected	—
`MT6835`	affected	—
`MT6858`	affected	—
`MT6878`	affected	—
`MT6879`	affected	—
`MT6881`	affected	—
`MT6886`	affected	—
`MT6895`	affected	—
`MT6896`	affected	—
`MT6897`	affected	—
`MT6899`	affected	—
`MT6980`	affected	—
`MT6982`	affected	—
`MT6983`	affected	—
`MT6985`	affected	—
`MT6986`	affected	—
`MT6986D`	affected	—
`MT6988`	affected	—
`MT6989`	affected	—
`MT6990`	affected	—
`MT6991`	affected	—
`MT6993`	affected	—
`MT8666`	affected	—
`MT8667`	affected	—
`MT8668`	affected	—
`MT8673`	affected	—
`MT8676`	affected	—
`MT8678`	affected	—
`MT8755`	affected	—
`MT8765`	affected	—
`MT8766`	affected	—
`MT8766R`	affected	—
`MT8768`	affected	—
`MT8775`	affected	—
`MT8781`	affected	—
`MT8786`	affected	—
`MT8788`	affected	—
`MT8788E`	affected	—
`MT8789`	affected	—
`MT8792`	affected	—
`MT8793`	affected	—
`MT8795T`	affected	—
`MT8796`	affected	—
`MT8798`	affected	—
`MT8863`	affected	—
`MT8873`	affected	—
`MT8883`	affected	—
`MT8893`	affected	—

No data.

Vendor Product Confidence Versions

Mediatek, Inc.

Mediatek Chipset

100%

Version	Status	Scheme	Platform
`MT2716`	affected	generic	—
`MT2737`	affected	generic	—
`MT6739`	affected	generic	—
`MT6761`	affected	generic	—
`MT6762`	affected	generic	—
`MT6763`	affected	generic	—
`MT6765`	affected	generic	—
`MT6767`	affected	generic	—
`MT6768`	affected	generic	—
`MT6769`	affected	generic	—
`MT6771`	affected	generic	—
`MT6779`	affected	generic	—
`MT6781`	affected	generic	—
`MT6783`	affected	generic	—
`MT6785`	affected	generic	—
`MT6789`	affected	generic	—
`MT6813`	affected	generic	—
`MT6835`	affected	generic	—
`MT6858`	affected	generic	—
`MT6878`	affected	generic	—
`MT6879`	affected	generic	—
`MT6881`	affected	generic	—
`MT6886`	affected	generic	—
`MT6895`	affected	generic	—
`MT6896`	affected	generic	—
`MT6897`	affected	generic	—
`MT6899`	affected	generic	—
`MT6980`	affected	generic	—
`MT6982`	affected	generic	—
`MT6983`	affected	generic	—
`MT6985`	affected	generic	—
`MT6986`	affected	generic	—
`MT6986D`	affected	generic	—
`MT6988`	affected	generic	—
`MT6989`	affected	generic	—
`MT6990`	affected	generic	—
`MT6991`	affected	generic	—
`MT6993`	affected	generic	—
`MT8666`	affected	generic	—
`MT8667`	affected	generic	—
`MT8668`	affected	generic	—
`MT8673`	affected	generic	—
`MT8676`	affected	generic	—
`MT8678`	affected	generic	—
`MT8755`	affected	generic	—
`MT8765`	affected	generic	—
`MT8766`	affected	generic	—
`MT8766R`	affected	generic	—
`MT8768`	affected	generic	—
`MT8775`	affected	generic	—
`MT8781`	affected	generic	—
`MT8786`	affected	generic	—
`MT8788`	affected	generic	—
`MT8788E`	affected	generic	—
`MT8789`	affected	generic	—
`MT8792`	affected	generic	—
`MT8793`	affected	generic	—
`MT8795T`	affected	generic	—
`MT8796`	affected	generic	—
`MT8798`	affected	generic	—
`MT8863`	affected	generic	—
`MT8873`	affected	generic	—
`MT8883`	affected	generic	—
`MT8893`	affected	generic	—

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Adjacent Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00204.

Exploitation none

Automatable no

Technical Impact total

References

Link	Providers
https://corp.mediatek.com/product-security-bulletin/July-2026

History

Wed, 08 Jul 2026 14:15:00 +0000

Type	Values Removed	Values Added
Title		Memory Corruption in MediaTek Modem Firmware Enables Remote Privilege Escalation

Tue, 07 Jul 2026 21:15:00 +0000

Type	Values Removed	Values Added
Title	Remote Privilege Escalation via Modem Memory Corruption on MediaTek Chipsets

Tue, 07 Jul 2026 09:45:00 +0000

Type	Values Removed	Values Added
Title		Remote Privilege Escalation via Modem Memory Corruption on MediaTek Chipsets

Mon, 06 Jul 2026 15:45:00 +0000

Type	Values Removed	Values Added
Title	Modem Firmware Missing Bounds Check Allows Remote Privilege Escalation

Sun, 05 Jul 2026 22:30:00 +0000

Type	Values Removed	Values Added
Title		Modem Firmware Missing Bounds Check Allows Remote Privilege Escalation

Sun, 05 Jul 2026 11:15:00 +0000

Type	Values Removed	Values Added
Title	Modem Firmware Buffer Overflow Enabling Remote Privilege Escalation

Sat, 04 Jul 2026 19:30:00 +0000

Type	Values Removed	Values Added
Title		Modem Firmware Buffer Overflow Enabling Remote Privilege Escalation

Sat, 04 Jul 2026 07:15:00 +0000

Type	Values Removed	Values Added
Title	Memory Corruption in MediaTek Modem Firmware Allows Remote Privilege Escalation

Fri, 03 Jul 2026 16:15:00 +0000

Type	Values Removed	Values Added
Title		Memory Corruption in MediaTek Modem Firmware Allows Remote Privilege Escalation

Fri, 03 Jul 2026 02:00:00 +0000

Type	Values Removed	Values Added
Title	Memory Corruption in MediaTek Modem Firmware Allows Remote Privilege Escalation

Thu, 02 Jul 2026 14:00:00 +0000

Type	Values Removed	Values Added
Title		Memory Corruption in MediaTek Modem Firmware Allows Remote Privilege Escalation

Thu, 02 Jul 2026 08:30:00 +0000

Type	Values Removed	Values Added
Title	Memory Corruption in MediaTek Modem Firmware Allows Remote Privilege Escalation

Thu, 02 Jul 2026 01:45:00 +0000

Type	Values Removed	Values Added
Title		Memory Corruption in MediaTek Modem Firmware Allows Remote Privilege Escalation

Wed, 01 Jul 2026 23:45:00 +0000

Type	Values Removed	Values Added
Title	MediaTek Modem Firmware Vulnerability Allows Remote Privilege Escalation via Rogue Base Station

Wed, 01 Jul 2026 19:00:00 +0000

Type	Values Removed	Values Added
Title		MediaTek Modem Firmware Vulnerability Allows Remote Privilege Escalation via Rogue Base Station

Wed, 01 Jul 2026 16:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Mediatek, Inc. Mediatek, Inc. mediatek Chipset
Vendors & Products		Mediatek, Inc. Mediatek, Inc. mediatek Chipset

Wed, 01 Jul 2026 11:30:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Wed, 01 Jul 2026 11:15:00 +0000

Type	Values Removed	Values Added
Title	Memory Corruption in Modem Leading to Remote Privilege Escalation

Wed, 01 Jul 2026 06:45:00 +0000

Type	Values Removed	Values Added
Title		Memory Corruption in Modem Leading to Remote Privilege Escalation

Wed, 01 Jul 2026 03:30:00 +0000

Type	Values Removed	Values Added
Description		In Modem, there is a possible memory corruption 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: MOLY01402160; Issue ID: MSV-7298.
Weaknesses		CWE-787
References		https://corp.mediatek.com/product-security-bulletin/July-2026

Subscriptions

Mediatek, Inc. Mediatek Chipset

MITRE

Status: PUBLISHED

Assigner: MediaTek

Published: 2026-07-01T03:13:59.663Z

Updated: 2026-07-02T03:55:19.970Z

Reserved: 2025-11-03T01:30:59.014Z

Link: CVE-2026-20458

Vulnrichment

Updated: 2026-07-01T10:38:41.163Z

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-07-08T14:00:03Z

Weaknesses

CWE-787

Tracking

Attack Vector Adjacent Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Exploitation none

Automatable no

Technical Impact total

Subscriptions

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