CVE-2026-20462 - Vulnerability Details

- Heap Buffer Overflow in Telephony Component Enables Local Privilege Escalation

Description

In Telephony, there is a possible memory corruption due to a heap buffer overflow. 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: ALPS11006447; Issue ID: MSV-7871.

Published: 2026-07-01

Score: 6.7 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
`MT6739`	affected	—
`MT6761`	affected	—
`MT6765`	affected	—
`MT6768`	affected	—
`MT6781`	affected	—
`MT6789`	affected	—
`MT6833`	affected	—
`MT6853`	affected	—
`MT6855`	affected	—
`MT6877`	affected	—
`MT6883`	affected	—
`MT6885`	affected	—
`MT6889`	affected	—
`MT6893`	affected	—
`MT8695`	affected	—
`MT8696`	affected	—
`MT8765`	affected	—
`MT8766`	affected	—
`MT8766R`	affected	—
`MT8768`	affected	—
`MT8781`	affected	—
`MT8791`	affected	—

No data.

Vendor Product Confidence Versions

Mediatek, Inc.

Mediatek Chipset

100%

Version	Status	Scheme	Platform
`MT6739`	affected	generic	—
`MT6761`	affected	generic	—
`MT6765`	affected	generic	—
`MT6768`	affected	generic	—
`MT6781`	affected	generic	—
`MT6789`	affected	generic	—
`MT6833`	affected	generic	—
`MT6853`	affected	generic	—
`MT6855`	affected	generic	—
`MT6877`	affected	generic	—
`MT6883`	affected	generic	—
`MT6885`	affected	generic	—
`MT6889`	affected	generic	—
`MT6893`	affected	generic	—
`MT8695`	affected	generic	—
`MT8696`	affected	generic	—
`MT8765`	affected	generic	—
`MT8766`	affected	generic	—
`MT8766R`	affected	generic	—
`MT8768`	affected	generic	—
`MT8781`	affected	generic	—
`MT8791`	affected	generic	—

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required High

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 0.00111.

Exploitation none

Automatable no

Technical Impact total

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		Heap Buffer Overflow in Telephony Component Enables Local Privilege Escalation

Mon, 06 Jul 2026 12:00:00 +0000

Type	Values Removed	Values Added
Title	Memory Corruption in MediaTek Telephony Leading to Local Privilege Escalation

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

Type	Values Removed	Values Added
Title		Memory Corruption in MediaTek Telephony Leading to Local Privilege Escalation

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

Type	Values Removed	Values Added
Title	Heap Buffer Overflow in MediaTek Telephony Subsystem Enables Local Privilege Escalation

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

Type	Values Removed	Values Added
Title		Heap Buffer Overflow in MediaTek Telephony Subsystem Enables Local Privilege Escalation

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

Type	Values Removed	Values Added
Title	Heap Buffer Overflow in Telephony Enables Local Privilege Escalation

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

Type	Values Removed	Values Added
Title		Heap Buffer Overflow in Telephony Enables Local Privilege Escalation

Fri, 03 Jul 2026 08:30:00 +0000

Type	Values Removed	Values Added
Title	Memory Corruption in Telephony Enables Local Privilege Escalation

Thu, 02 Jul 2026 19:30:00 +0000

Type	Values Removed	Values Added
Title		Memory Corruption in Telephony Enables Local Privilege Escalation

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

Type	Values Removed	Values Added
Title	Heap Buffer Overflow in MediaTek Telephony Enables Local Privilege Escalation

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

Type	Values Removed	Values Added
Title		Heap Buffer Overflow in MediaTek Telephony Enables Local Privilege Escalation

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

Type	Values Removed	Values Added
Title	MediaTek Telephony Heap Buffer Overflow Leading to Local Privilege Escalation

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

Type	Values Removed	Values Added
Title		MediaTek Telephony Heap Buffer Overflow Leading to Local Privilege Escalation

Wed, 01 Jul 2026 17:30:00 +0000

Type	Values Removed	Values Added
Title	Heap Buffer Overflow in MediaTek Telephony Subsystem Enables Local Privilege Escalation

Wed, 01 Jul 2026 13:45:00 +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': 6.7, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/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 09:15:00 +0000

Type	Values Removed	Values Added
Title		Heap Buffer Overflow in MediaTek Telephony Subsystem Enables Local Privilege Escalation

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

Type	Values Removed	Values Added
Description		In Telephony, there is a possible memory corruption due to a heap buffer overflow. 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: ALPS11006447; Issue ID: MSV-7871.
Weaknesses		CWE-122
References		https://corp.mediatek.com/product-security-bulletin/July-2026

Subscriptions

Mediatek, Inc. Mediatek Chipset

MITRE

Status: PUBLISHED

Assigner: MediaTek

Published: 2026-07-01T03:14:04.991Z

Updated: 2026-07-02T03:55:17.558Z

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

Link: CVE-2026-20462

Vulnrichment

Updated: 2026-07-01T10:36:28.557Z

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-07-07T21:00:04Z

Weaknesses

CWE-122

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required High

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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