CVE-2026-20459 - Vulnerability Details

- Covert Modem Firmware Crash Causing Remote Denial of Service

Description

In Modem, there is a possible system crash due to improper input validation. 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: MOLY01816800; Issue ID: MSV-6842.

Published: 2026-07-01

Score: 5.3 Medium

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	—
`MT2735`	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	—
`MT6833`	affected	—
`MT6835`	affected	—
`MT6853`	affected	—
`MT6855`	affected	—
`MT6858`	affected	—
`MT6873`	affected	—
`MT6875`	affected	—
`MT6877`	affected	—
`MT6878`	affected	—
`MT6879`	affected	—
`MT6880`	affected	—
`MT6881`	affected	—
`MT6883`	affected	—
`MT6885`	affected	—
`MT6886`	affected	—
`MT6889`	affected	—
`MT6890`	affected	—
`MT6891`	affected	—
`MT6893`	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	—
`MT8675`	affected	—
`MT8676`	affected	—
`MT8678`	affected	—
`MT8755`	affected	—
`MT8765`	affected	—
`MT8766`	affected	—
`MT8766R`	affected	—
`MT8768`	affected	—
`MT8771`	affected	—
`MT8775`	affected	—
`MT8781`	affected	—
`MT8786`	affected	—
`MT8788`	affected	—
`MT8788E`	affected	—
`MT8789`	affected	—
`MT8791`	affected	—
`MT8791T`	affected	—
`MT8792`	affected	—
`MT8793`	affected	—
`MT8795T`	affected	—
`MT8796`	affected	—
`MT8797`	affected	—
`MT8798`	affected	—
`MT8863`	affected	—
`MT8873`	affected	—
`MT8883`	affected	—
`MT8893`	affected	—

No data.

Vendor Product Confidence Versions

Mediatek, Inc.

Mediatek Chipset

95%

Version	Status	Scheme	Platform
`MT2716`	affected	generic	—
`MT2735`	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	—
`MT6833`	affected	generic	—
`MT6835`	affected	generic	—
`MT6853`	affected	generic	—
`MT6855`	affected	generic	—
`MT6858`	affected	generic	—
`MT6873`	affected	generic	—
`MT6875`	affected	generic	—
`MT6877`	affected	generic	—
`MT6878`	affected	generic	—
`MT6879`	affected	generic	—
`MT6880`	affected	generic	—
`MT6881`	affected	generic	—
`MT6883`	affected	generic	—
`MT6885`	affected	generic	—
`MT6886`	affected	generic	—
`MT6889`	affected	generic	—
`MT6890`	affected	generic	—
`MT6891`	affected	generic	—
`MT6893`	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	—
`MT8675`	affected	generic	—
`MT8676`	affected	generic	—
`MT8678`	affected	generic	—
`MT8755`	affected	generic	—
`MT8765`	affected	generic	—
`MT8766`	affected	generic	—
`MT8766R`	affected	generic	—
`MT8768`	affected	generic	—
`MT8771`	affected	generic	—
`MT8775`	affected	generic	—
`MT8781`	affected	generic	—
`MT8786`	affected	generic	—
`MT8788`	affected	generic	—
`MT8788E`	affected	generic	—
`MT8789`	affected	generic	—
`MT8791`	affected	generic	—
`MT8791T`	affected	generic	—
`MT8792`	affected	generic	—
`MT8793`	affected	generic	—
`MT8795T`	affected	generic	—
`MT8796`	affected	generic	—
`MT8797`	affected	generic	—
`MT8798`	affected	generic	—
`MT8863`	affected	generic	—
`MT8873`	affected	generic	—
`MT8883`	affected	generic	—
`MT8893`	affected	generic	—

Found an issue or want to improve our Enrichment? You can suggest it directly by opening an issue on our dedicated GitHub repository .

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 None

Integrity Impact None

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 0.00169.

Exploitation none

Automatable no

Technical Impact partial

References

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

History

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

Type	Values Removed	Values Added
Title		Covert Modem Firmware Crash Causing Remote Denial of Service

Mon, 06 Jul 2026 20:30:00 +0000

Type	Values Removed	Values Added
Title	Modem Crash from Improper Input Validation Leading to Remote Denial of Service

Mon, 06 Jul 2026 03:15:00 +0000

Type	Values Removed	Values Added
Title		Modem Crash from Improper Input Validation Leading to Remote Denial of Service

Sun, 05 Jul 2026 19:15:00 +0000

Type	Values Removed	Values Added
Title	Modem input validation flaw can crash device, enabling remote denial of service

Sun, 05 Jul 2026 06:30:00 +0000

Type	Values Removed	Values Added
Title		Modem input validation flaw can crash device, enabling remote denial of service

Sat, 04 Jul 2026 22:45:00 +0000

Type	Values Removed	Values Added
Title	Modem Input Validation Crash Causing Remote Denial of Service on MediaTek Chipsets

Sat, 04 Jul 2026 11:30:00 +0000

Type	Values Removed	Values Added
Title		Modem Input Validation Crash Causing Remote Denial of Service on MediaTek Chipsets

Sat, 04 Jul 2026 03:45:00 +0000

Type	Values Removed	Values Added
Title	Remote Denial of Service via Improper Input Validation in MediaTek Modem

Fri, 03 Jul 2026 19:30:00 +0000

Type	Values Removed	Values Added
Title		Remote Denial of Service via Improper Input Validation in MediaTek Modem

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

Type	Values Removed	Values Added
Title	Modem Component Input Validation Failure Leads to Remote Denial of Service on MediaTek Chipsets

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

Type	Values Removed	Values Added
Title		Modem Component Input Validation Failure Leads to Remote Denial of Service on MediaTek Chipsets

Thu, 02 Jul 2026 04:15:00 +0000

Type	Values Removed	Values Added
Title	Modem Input Validation Crash Allowing Remote Denial of Service on MediaTek Chipsets

Wed, 01 Jul 2026 22:00:00 +0000

Type	Values Removed	Values Added
Title		Modem Input Validation Crash Allowing Remote Denial of Service on MediaTek Chipsets

Wed, 01 Jul 2026 14:30:00 +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': 5.3, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

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

Type	Values Removed	Values Added
Title	Modem Denial of Service via Improper Input Validation on MediaTek Chipset

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

Type	Values Removed	Values Added
Title		Modem Denial of Service via Improper Input Validation on MediaTek Chipset

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

Type	Values Removed	Values Added
Description		In Modem, there is a possible system crash due to improper input validation. 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: MOLY01816800; Issue ID: MSV-6842.
Weaknesses		CWE-288
References		https://corp.mediatek.com/product-security-bulletin/July-2026

Subscriptions

Mediatek, Inc. Mediatek Chipset

MITRE

Status: PUBLISHED

Assigner: MediaTek

Published: 2026-07-01T03:14:00.977Z

Updated: 2026-07-01T10:39:19.025Z

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

Link: CVE-2026-20459

Vulnrichment

Updated: 2026-07-01T10:37:55.959Z

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-07-07T09:30:04Z

Weaknesses

CWE-288

Tracking

Attack Vector Adjacent Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Exploitation none

Automatable no

Technical Impact partial

Subscriptions

JSON object

JSON object

JSON object

JSON object

JSON object